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Pull more SCSI updates from James Bottomley:
"This is the set of changes collected since just before the merge
window opened. It's mostly minor fixes in drivers.
The one non-driver set is the three optical disk (sr) changes where
two are error path fixes and one is a helper conversion.
The big driver change is the hpsa compat_alloc_userspace rework by Al
so he can kill the remaining user. This has been tested and acked by
the maintainer"
* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (21 commits)
scsi: acornscsi: Fix an error handling path in acornscsi_probe()
scsi: storvsc: Remove memset before memory freeing in storvsc_suspend()
scsi: cxlflash: Remove an unnecessary NULL check
scsi: ibmvscsi: Don't send host info in adapter info MAD after LPM
scsi: sr: Fix sr_probe() missing deallocate of device minor
scsi: sr: Fix sr_probe() missing mutex_destroy
scsi: st: Convert convert get_user_pages() --> pin_user_pages()
scsi: target: Rename target_setup_cmd_from_cdb() to target_cmd_parse_cdb()
scsi: target: Fix NULL pointer dereference
scsi: target: Initialize LUN in transport_init_se_cmd()
scsi: target: Factor out a new helper, target_cmd_init_cdb()
scsi: hpsa: hpsa_ioctl(): Tidy up a bit
scsi: hpsa: Get rid of compat_alloc_user_space()
scsi: hpsa: Don't bother with vmalloc for BIG_IOCTL_Command_struct
scsi: hpsa: Lift {BIG_,}IOCTL_Command_struct copy{in,out} into hpsa_ioctl()
scsi: ufs: Remove redundant urgent_bkop_lvl initialization
scsi: ufs: Don't update urgent bkops level when toggling auto bkops
scsi: qedf: Remove redundant initialization of variable rc
scsi: mpt3sas: Fix memset() in non-RDPQ mode
scsi: iscsi: Fix reference count leak in iscsi_boot_create_kobj
...
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If the cdrom fails to be registered then the device minor should be
deallocated.
Link: https://lore.kernel.org/r/072dac4b-8402-4de8-36bd-47e7588969cd@0882a8b5-c6c3-11e9-b005-00805fc181fe
Signed-off-by: Simon Arlott <simon@octiron.net>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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If the device minor cannot be allocated or the cdrom fails to be registered
then the mutex should be destroyed.
Link: https://lore.kernel.org/r/06e9de38-eeed-1cab-5e08-e889288935b3@0882a8b5-c6c3-11e9-b005-00805fc181fe
Fixes: 51a858817dcd ("scsi: sr: get rid of sr global mutex")
Signed-off-by: Simon Arlott <simon@octiron.net>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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Pull SCSI updates from James Bottomley:
:This series consists of the usual driver updates (qla2xxx, ufs, zfcp,
target, scsi_debug, lpfc, qedi, qedf, hisi_sas, mpt3sas) plus a host
of other minor updates.
There are no major core changes in this series apart from a
refactoring in scsi_lib.c"
* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (207 commits)
scsi: ufs: ti-j721e-ufs: Fix unwinding of pm_runtime changes
scsi: cxgb3i: Fix some leaks in init_act_open()
scsi: ibmvscsi: Make some functions static
scsi: iscsi: Fix deadlock on recovery path during GFP_IO reclaim
scsi: ufs: Fix WriteBooster flush during runtime suspend
scsi: ufs: Fix index of attributes query for WriteBooster feature
scsi: ufs: Allow WriteBooster on UFS 2.2 devices
scsi: ufs: Remove unnecessary memset for dev_info
scsi: ufs-qcom: Fix scheduling while atomic issue
scsi: mpt3sas: Fix reply queue count in non RDPQ mode
scsi: lpfc: Fix lpfc_nodelist leak when processing unsolicited event
scsi: target: tcmu: Fix a use after free in tcmu_check_expired_queue_cmd()
scsi: vhost: Notify TCM about the maximum sg entries supported per command
scsi: qla2xxx: Remove return value from qla_nvme_ls()
scsi: qla2xxx: Remove an unused function
scsi: iscsi: Register sysfs for iscsi workqueue
scsi: scsi_debug: Parser tables and code interaction
scsi: core: Refactor scsi_mq_setup_tags function
scsi: core: Fix incorrect usage of shost_for_each_device
scsi: qla2xxx: Fix endianness annotations in source files
...
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Add a pointer to the CDROM information structure to struct gendisk.
This will allow various removable media file systems to call directly
into the CDROM layer instead of abusing ioctls with kernel pointers.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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This patch makes the sr code slightly easier to read.
Link: https://lore.kernel.org/r/20200427014844.12109-1-bvanassche@acm.org
Cc: Merlijn Wajer <merlijn@archive.org>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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Pull more SCSI updates from James Bottomley:
"This is a batch of changes that didn't make it in the initial pull
request because the lpfc series had to be rebased to redo an incorrect
split.
It's basically driver updates to lpfc, target, bnx2fc and ufs with the
rest being minor updates except the sr_block_release one which fixes a
use after free introduced by the removal of the global mutex in the
first patch set"
* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (35 commits)
scsi: core: Add DID_ALLOC_FAILURE and DID_MEDIUM_ERROR to hostbyte_table
scsi: ufs: Use ufshcd_config_pwr_mode() when scaling gear
scsi: bnx2fc: fix boolreturn.cocci warnings
scsi: zfcp: use fallthrough;
scsi: aacraid: do not overwrite retval in aac_reset_adapter()
scsi: sr: Fix sr_block_release()
scsi: aic7xxx: Remove more FreeBSD-specific code
scsi: mpt3sas: Fix kernel panic observed on soft HBA unplug
scsi: ufs: set device as active power mode after resetting device
scsi: iscsi: Report unbind session event when the target has been removed
scsi: lpfc: Change default SCSI LUN QD to 64
scsi: libfc: rport state move to PLOGI if all PRLI retry exhausted
scsi: libfc: If PRLI rejected, move rport to PLOGI state
scsi: bnx2fc: Update the driver version to 2.12.13
scsi: bnx2fc: Fix SCSI command completion after cleanup is posted
scsi: bnx2fc: Process the RQE with CQE in interrupt context
scsi: target: use the stack for XCOPY passthrough cmds
scsi: target: increase XCOPY I/O size
scsi: target: avoid per-loop XCOPY buffer allocations
scsi: target: drop xcopy DISK BLOCK LENGTH debug
...
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Pull SCSI updates from James Bottomley:
"This series has a huge amount of churn because it pulls in Mauro's doc
update changing all our txt files to rst ones.
Excluding that, we have the usual driver updates (qla2xxx, ufs, lpfc,
zfcp, ibmvfc, pm80xx, aacraid), a treewide update for scnprintf and
some other minor updates.
The major core change is Hannes moving functions out of the aacraid
driver and into the core"
* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (223 commits)
scsi: aic7xxx: aic97xx: Remove FreeBSD-specific code
scsi: ufs: Do not rely on prefetched data
scsi: dc395x: remove dc395x_bios_param
scsi: libiscsi: Fix error count for active session
scsi: hpsa: correct race condition in offload enabled
scsi: message: fusion: Replace zero-length array with flexible-array member
scsi: qedi: Add PCI shutdown handler support
scsi: qedi: Add MFW error recovery process
scsi: ufs: Enable block layer runtime PM for well-known logical units
scsi: ufs-qcom: Override devfreq parameters
scsi: ufshcd: Let vendor override devfreq parameters
scsi: ufshcd: Update the set frequency to devfreq
scsi: ufs: Resume ufs host before accessing ufs device
scsi: ufs-mediatek: customize the delay for enabling host
scsi: ufs: make HCE polling more compact to improve initialization latency
scsi: ufs: allow custom delay prior to host enabling
scsi: ufs-mediatek: use common delay function
scsi: ufs: introduce common and flexible delay function
scsi: ufs: use an enum for host capabilities
scsi: ufs: fix uninitialized tx_lanes in ufshcd_disable_tx_lcc()
...
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This patch fixes the following two complaints:
WARNING: CPU: 3 PID: 1326 at kernel/locking/mutex-debug.c:103 mutex_destroy+0x74/0x80
Modules linked in: scsi_debug sd_mod t10_pi brd scsi_transport_iscsi af_packet crct10dif_pclmul sg aesni_intel glue_helper virtio_balloon button crypto_simd cryptd intel_agp intel_gtt agpgart ip_tables x_tables ipv6 nf_defrag_ipv6 autofs4 ext4 crc16 mbcache jbd2 hid_generic usbhid hid sr_mod cdrom ata_generic pata_acpi virtio_blk virtio_net net_failover failover ata_piix xhci_pci ahci libahci xhci_hcd i2c_piix4 libata virtio_pci usbcore i2c_core virtio_ring scsi_mod usb_common virtio [last unloaded: scsi_debug]
CPU: 3 PID: 1326 Comm: systemd-udevd Not tainted 5.6.0-rc1-dbg+ #1
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
RIP: 0010:mutex_destroy+0x74/0x80
Call Trace:
sr_kref_release+0xb9/0xd0 [sr_mod]
scsi_cd_put+0x79/0x90 [sr_mod]
sr_block_release+0x54/0x70 [sr_mod]
__blkdev_put+0x2ce/0x3c0
blkdev_put+0x68/0x220
blkdev_close+0x4d/0x60
__fput+0x170/0x3b0
____fput+0x12/0x20
task_work_run+0xa2/0xf0
exit_to_usermode_loop+0xeb/0xf0
do_syscall_64+0x2be/0x300
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fa16d40aab7
BUG: KASAN: use-after-free in __mutex_unlock_slowpath+0x98/0x420
Read of size 8 at addr ffff8881c6e4f4b0 by task systemd-udevd/1326
CPU: 3 PID: 1326 Comm: systemd-udevd Tainted: G W 5.6.0-rc1-dbg+ #1
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
Call Trace:
dump_stack+0xa5/0xe6
print_address_description.constprop.0+0x46/0x60
__kasan_report.cold+0x7b/0x94
kasan_report+0x16/0x20
check_memory_region+0x140/0x1b0
__kasan_check_read+0x15/0x20
__mutex_unlock_slowpath+0x98/0x420
mutex_unlock+0x16/0x20
sr_block_release+0x5c/0x70 [sr_mod]
__blkdev_put+0x2ce/0x3c0
hardirqs last enabled at (1875522): [<ffffffff81bb0696>] _raw_spin_unlock_irqrestore+0x56/0x70
blkdev_put+0x68/0x220
blkdev_close+0x4d/0x60
__fput+0x170/0x3b0
____fput+0x12/0x20
task_work_run+0xa2/0xf0
exit_to_usermode_loop+0xeb/0xf0
do_syscall_64+0x2be/0x300
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fa16d40aab7
Allocated by task 3201:
save_stack+0x23/0x90
__kasan_kmalloc.constprop.0+0xcf/0xe0
kasan_kmalloc+0xd/0x10
kmem_cache_alloc_trace+0x161/0x3c0
sr_probe+0x12f/0xb60 [sr_mod]
really_probe+0x183/0x5d0
driver_probe_device+0x13f/0x1a0
__device_attach_driver+0xe6/0x150
bus_for_each_drv+0x101/0x160
__device_attach+0x183/0x230
device_initial_probe+0x17/0x20
bus_probe_device+0x110/0x130
device_add+0xb7b/0xd40
scsi_sysfs_add_sdev+0xe8/0x360 [scsi_mod]
scsi_probe_and_add_lun+0xdc4/0x14c0 [scsi_mod]
__scsi_scan_target+0x12d/0x850 [scsi_mod]
scsi_scan_channel+0xcd/0xe0 [scsi_mod]
scsi_scan_host_selected+0x182/0x190 [scsi_mod]
store_scan+0x1e9/0x200 [scsi_mod]
dev_attr_store+0x42/0x60
sysfs_kf_write+0x8b/0xb0
kernfs_fop_write+0x158/0x250
__vfs_write+0x4c/0x90
vfs_write+0x145/0x2c0
ksys_write+0xd7/0x180
__x64_sys_write+0x47/0x50
do_syscall_64+0x6f/0x300
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 1326:
save_stack+0x23/0x90
__kasan_slab_free+0x13a/0x190
kasan_slab_free+0x12/0x20
kfree+0x109/0x410
sr_kref_release+0xc1/0xd0 [sr_mod]
scsi_cd_put+0x79/0x90 [sr_mod]
sr_block_release+0x54/0x70 [sr_mod]
__blkdev_put+0x2ce/0x3c0
blkdev_put+0x68/0x220
blkdev_close+0x4d/0x60
__fput+0x170/0x3b0
____fput+0x12/0x20
task_work_run+0xa2/0xf0
exit_to_usermode_loop+0xeb/0xf0
do_syscall_64+0x2be/0x300
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Link: https://lore.kernel.org/r/20200330025151.10535-1-bvanassche@acm.org
Fixes: 51a858817dcd ("scsi: sr: get rid of sr global mutex")
Cc: Merlijn Wajer <merlijn@archive.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: <stable@kernel.org>
Acked-by: Merlijn Wajer <merlijn@archive.org>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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appropriate places
Arnd Bergmann inadvertently typoed these in d320a9551e394 and 64cbfa96551a;
they seem to be the cause of
https://bugzilla.redhat.com/show_bug.cgi?id=1801353 , invalid SCSI commands
when udev tries to query a DVD drive.
[arnd] Found another instance of the same bug, also introduced in my
compat_ioctl series.
Link: https://bugzilla.redhat.com/show_bug.cgi?id=1801353
Link: https://lore.kernel.org/r/20200219165139.3467320-1-arnd@arndb.de
Fixes: c103d6ee69f9 ("compat_ioctl: ide: floppy: add handler")
Fixes: 64cbfa96551a ("compat_ioctl: move cdrom commands into cdrom.c")
Fixes: d320a9551e39 ("compat_ioctl: scsi: move ioctl handling into drivers")
Bisected-by: Chris Murphy <bugzilla@colorremedies.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Adam Williamson <awilliam@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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When replacing the Big Kernel Lock in commit 2a48fc0ab242 ("block:
autoconvert trivial BKL users to private mutex"), the lock was replaced
with a sr-wide lock.
This causes very poor performance when using multiple sr devices, as the sr
driver was not able to execute more than one command to one drive at any
given time, even when there were many CD drives available.
Replace the global mutex with per-sr-device mutex.
Someone tried this patch at the time, but it never made it upstream, due to
possible concerns with race conditions, but it's not clear the patch
actually caused those:
https://www.spinics.net/lists/linux-scsi/msg63706.html
https://www.spinics.net/lists/linux-scsi/msg63750.html
Also see
http://lists.xiph.org/pipermail/paranoia/2019-December/001647.html
Link: https://lore.kernel.org/r/20200218143918.30267-1-merlijn@archive.org
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Merlijn Wajer <merlijn@archive.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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There is no need for the special cases for the cdrom ioctls any more now,
so make sure that each cdrom driver has a .compat_ioctl() callback and
calls cdrom_compat_ioctl() directly there.
Reviewed-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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Each driver calling scsi_ioctl() gets an equivalent compat_ioctl()
handler that implements the same commands by calling scsi_compat_ioctl().
The scsi_cmd_ioctl() and scsi_cmd_blk_ioctl() functions are compatible
at this point, so any driver that calls those can do so for both native
and compat mode, with the argument passed through compat_ptr().
With this, we can remove the entries from fs/compat_ioctl.c. The new
code is larger, but should be easier to maintain and keep updated with
newly added commands.
Reviewed-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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Add SPDX license identifiers to all files which:
- Have no license information of any form
- Have MODULE_LICENCE("GPL*") inside which was used in the initial
scan/conversion to ignore the file
These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:
GPL-2.0-only
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Currently, an empty disk->events field tells the block layer not to
forward media change events to user space. This was done in commit
7c88a168da80 ("block: don't propagate unlisted DISK_EVENTs to userland")
in order to avoid events from "fringe" drivers to be forwarded to user
space. By doing so, the block layer lost the information which events
were supported by a particular block device, and most importantly,
whether or not a given device supports media change events at all.
Prepare for not interpreting the "events" field this way in the future
any more. This is done by adding an additional field "event_flags" to
struct gendisk, and two flag bits that can be set to have the device
treated like one that had the "events" field set to a non-zero value
before. This applies only to the sd and sr drivers, which are changed to
set the new flags.
The new flags are DISK_EVENT_FLAG_POLL to enforce polling of the device
for synchronous events, and DISK_EVENT_FLAG_UEVENT to tell the
blocklayer to generate udev events from kernel events.
In order to add the event_flags field to struct gendisk, the events
field is converted to an "unsigned short"; it doesn't need to hold
values bigger than 2 anyway.
This patch doesn't change behavior.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin Wilck <mwilck@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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No more need in a blk-mq world where the scsi command and request are
allocated together.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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Replace the old BLKPREP_* values with the BLK_STS_ ones that they are
converted to later anyway.
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Update device_add_disk() to take an 'groups' argument so that
individual drivers can register a device with additional sysfs
attributes.
This avoids race condition the driver would otherwise have if these
groups were to be created with sysfs_add_groups().
Signed-off-by: Martin Wilck <martin.wilck@suse.com>
Signed-off-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Move the code for runtime power management from blk-core.c into the
new source file blk-pm.c. Move the corresponding declarations from
<linux/blkdev.h> into <linux/blk-pm.h>. For CONFIG_PM=n, leave out
the declarations of the functions that are not used in that mode.
This patch not only reduces the number of #ifdefs in the block layer
core code but also reduces the size of header file <linux/blkdev.h>
and hence should help to reduce the build time of the Linux kernel
if CONFIG_PM is not defined.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Jianchao Wang <jianchao.w.wang@oracle.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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enabled
Surround scsi_execute() calls with scsi_autopm_get_device() and
scsi_autopm_put_device(). Note: removing sr_mutex protection from the
scsi_cd_get() and scsi_cd_put() calls is safe because the purpose of
sr_mutex is to serialize cdrom_*() calls.
This patch avoids that complaints similar to the following appear in the
kernel log if runtime power management is enabled:
INFO: task systemd-udevd:650 blocked for more than 120 seconds.
Not tainted 4.18.0-rc7-dbg+ #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
systemd-udevd D28176 650 513 0x00000104
Call Trace:
__schedule+0x444/0xfe0
schedule+0x4e/0xe0
schedule_preempt_disabled+0x18/0x30
__mutex_lock+0x41c/0xc70
mutex_lock_nested+0x1b/0x20
__blkdev_get+0x106/0x970
blkdev_get+0x22c/0x5a0
blkdev_open+0xe9/0x100
do_dentry_open.isra.19+0x33e/0x570
vfs_open+0x7c/0xd0
path_openat+0x6e3/0x1120
do_filp_open+0x11c/0x1c0
do_sys_open+0x208/0x2d0
__x64_sys_openat+0x59/0x70
do_syscall_64+0x77/0x230
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Maurizio Lombardi <mlombard@redhat.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: <stable@vger.kernel.org>
Tested-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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We can't just use scsi_cd() to get the scsi_cd structure, we have
to grab a live reference to the device. For both callbacks, we're
not inside an open where we already hold a reference to the device.
This fixes device removal/addition under concurrent device access,
which otherwise could result in the below oops.
NULL pointer dereference at 0000000000000010
PGD 0 P4D 0
Oops: 0000 [#1] PREEMPT SMP
Modules linked in:
sr 12:0:0:0: [sr2] scsi-1 drive
scsi_debug crc_t10dif crct10dif_generic crct10dif_common nvme nvme_core sb_edac xl
sr 12:0:0:0: Attached scsi CD-ROM sr2
sr_mod cdrom btrfs xor zstd_decompress zstd_compress xxhash lzo_compress zlib_defc
sr 12:0:0:0: Attached scsi generic sg7 type 5
igb ahci libahci i2c_algo_bit libata dca [last unloaded: crc_t10dif]
CPU: 43 PID: 4629 Comm: systemd-udevd Not tainted 4.16.0+ #650
Hardware name: Dell Inc. PowerEdge T630/0NT78X, BIOS 2.3.4 11/09/2016
RIP: 0010:sr_block_revalidate_disk+0x23/0x190 [sr_mod]
RSP: 0018:ffff883ff357bb58 EFLAGS: 00010292
RAX: ffffffffa00b07d0 RBX: ffff883ff3058000 RCX: ffff883ff357bb66
RDX: 0000000000000003 RSI: 0000000000007530 RDI: ffff881fea631000
RBP: 0000000000000000 R08: ffff881fe4d38400 R09: 0000000000000000
R10: 0000000000000000 R11: 00000000000001b6 R12: 000000000800005d
R13: 000000000800005d R14: ffff883ffd9b3790 R15: 0000000000000000
FS: 00007f7dc8e6d8c0(0000) GS:ffff883fff340000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000010 CR3: 0000003ffda98005 CR4: 00000000003606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
? __invalidate_device+0x48/0x60
check_disk_change+0x4c/0x60
sr_block_open+0x16/0xd0 [sr_mod]
__blkdev_get+0xb9/0x450
? iget5_locked+0x1c0/0x1e0
blkdev_get+0x11e/0x320
? bdget+0x11d/0x150
? _raw_spin_unlock+0xa/0x20
? bd_acquire+0xc0/0xc0
do_dentry_open+0x1b0/0x320
? inode_permission+0x24/0xc0
path_openat+0x4e6/0x1420
? cpumask_any_but+0x1f/0x40
? flush_tlb_mm_range+0xa0/0x120
do_filp_open+0x8c/0xf0
? __seccomp_filter+0x28/0x230
? _raw_spin_unlock+0xa/0x20
? __handle_mm_fault+0x7d6/0x9b0
? list_lru_add+0xa8/0xc0
? _raw_spin_unlock+0xa/0x20
? __alloc_fd+0xaf/0x160
? do_sys_open+0x1a6/0x230
do_sys_open+0x1a6/0x230
do_syscall_64+0x5a/0x100
entry_SYSCALL_64_after_hwframe+0x3d/0xa2
Reviewed-by: Lee Duncan <lduncan@suse.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
|
when mounting an ISO filesystem sometimes (very rarely)
the system hangs because of a race condition between two tasks.
PID: 6766 TASK: ffff88007b2a6dd0 CPU: 0 COMMAND: "mount"
#0 [ffff880078447ae0] __schedule at ffffffff8168d605
#1 [ffff880078447b48] schedule_preempt_disabled at ffffffff8168ed49
#2 [ffff880078447b58] __mutex_lock_slowpath at ffffffff8168c995
#3 [ffff880078447bb8] mutex_lock at ffffffff8168bdef
#4 [ffff880078447bd0] sr_block_ioctl at ffffffffa00b6818 [sr_mod]
#5 [ffff880078447c10] blkdev_ioctl at ffffffff812fea50
#6 [ffff880078447c70] ioctl_by_bdev at ffffffff8123a8b3
#7 [ffff880078447c90] isofs_fill_super at ffffffffa04fb1e1 [isofs]
#8 [ffff880078447da8] mount_bdev at ffffffff81202570
#9 [ffff880078447e18] isofs_mount at ffffffffa04f9828 [isofs]
#10 [ffff880078447e28] mount_fs at ffffffff81202d09
#11 [ffff880078447e70] vfs_kern_mount at ffffffff8121ea8f
#12 [ffff880078447ea8] do_mount at ffffffff81220fee
#13 [ffff880078447f28] sys_mount at ffffffff812218d6
#14 [ffff880078447f80] system_call_fastpath at ffffffff81698c49
RIP: 00007fd9ea914e9a RSP: 00007ffd5d9bf648 RFLAGS: 00010246
RAX: 00000000000000a5 RBX: ffffffff81698c49 RCX: 0000000000000010
RDX: 00007fd9ec2bc210 RSI: 00007fd9ec2bc290 RDI: 00007fd9ec2bcf30
RBP: 0000000000000000 R8: 0000000000000000 R9: 0000000000000010
R10: 00000000c0ed0001 R11: 0000000000000206 R12: 00007fd9ec2bc040
R13: 00007fd9eb6b2380 R14: 00007fd9ec2bc210 R15: 00007fd9ec2bcf30
ORIG_RAX: 00000000000000a5 CS: 0033 SS: 002b
This task was trying to mount the cdrom. It allocated and configured a
super_block struct and owned the write-lock for the super_block->s_umount
rwsem. While exclusively owning the s_umount lock, it called
sr_block_ioctl and waited to acquire the global sr_mutex lock.
PID: 6785 TASK: ffff880078720fb0 CPU: 0 COMMAND: "systemd-udevd"
#0 [ffff880078417898] __schedule at ffffffff8168d605
#1 [ffff880078417900] schedule at ffffffff8168dc59
#2 [ffff880078417910] rwsem_down_read_failed at ffffffff8168f605
#3 [ffff880078417980] call_rwsem_down_read_failed at ffffffff81328838
#4 [ffff8800784179d0] down_read at ffffffff8168cde0
#5 [ffff8800784179e8] get_super at ffffffff81201cc7
#6 [ffff880078417a10] __invalidate_device at ffffffff8123a8de
#7 [ffff880078417a40] flush_disk at ffffffff8123a94b
#8 [ffff880078417a88] check_disk_change at ffffffff8123ab50
#9 [ffff880078417ab0] cdrom_open at ffffffffa00a29e1 [cdrom]
#10 [ffff880078417b68] sr_block_open at ffffffffa00b6f9b [sr_mod]
#11 [ffff880078417b98] __blkdev_get at ffffffff8123ba86
#12 [ffff880078417bf0] blkdev_get at ffffffff8123bd65
#13 [ffff880078417c78] blkdev_open at ffffffff8123bf9b
#14 [ffff880078417c90] do_dentry_open at ffffffff811fc7f7
#15 [ffff880078417cd8] vfs_open at ffffffff811fc9cf
#16 [ffff880078417d00] do_last at ffffffff8120d53d
#17 [ffff880078417db0] path_openat at ffffffff8120e6b2
#18 [ffff880078417e48] do_filp_open at ffffffff8121082b
#19 [ffff880078417f18] do_sys_open at ffffffff811fdd33
#20 [ffff880078417f70] sys_open at ffffffff811fde4e
#21 [ffff880078417f80] system_call_fastpath at ffffffff81698c49
RIP: 00007f29438b0c20 RSP: 00007ffc76624b78 RFLAGS: 00010246
RAX: 0000000000000002 RBX: ffffffff81698c49 RCX: 0000000000000000
RDX: 00007f2944a5fa70 RSI: 00000000000a0800 RDI: 00007f2944a5fa70
RBP: 00007f2944a5f540 R8: 0000000000000000 R9: 0000000000000020
R10: 00007f2943614c40 R11: 0000000000000246 R12: ffffffff811fde4e
R13: ffff880078417f78 R14: 000000000000000c R15: 00007f2944a4b010
ORIG_RAX: 0000000000000002 CS: 0033 SS: 002b
This task tried to open the cdrom device, the sr_block_open function
acquired the global sr_mutex lock. The call to check_disk_change()
then saw an event flag indicating a possible media change and tried
to flush any cached data for the device.
As part of the flush, it tried to acquire the super_block->s_umount
lock associated with the cdrom device.
This was the same super_block as created and locked by the previous task.
The first task acquires the s_umount lock and then the sr_mutex_lock;
the second task acquires the sr_mutex_lock and then the s_umount lock.
This patch fixes the issue by moving check_disk_change() out of
cdrom_open() and let the caller take care of it.
Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
|
Before scsi_prep_fn() calls the ULP .init_command() callback
function it stores the SCSI command pointer in request.special.
This means that the SCpnt = rq->special assignments in the sd
and sr drivers assign a pointer to itself. Hence convert these
two assignment statements into warning statements.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
|
|
Kefeng Wang discovered that old versions of the QEMU CD driver would
return mangled mode data causing us to walk off the end of the buffer in
an attempt to parse it. Sanity check the returned mode sense data.
Cc: <stable@vger.kernel.org>
Reported-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Tested-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
|
|
Signed-off-by: Jens Axboe <axboe@fb.com>
|
|
Since function tables are a common target for attackers, it's best to keep
them in read-only memory. As such, this makes the CDROM device ops tables
const. This drops additionally n_minors, since it isn't used meaningfully,
and sets the only user of cdrom_dummy_generic_packet explicitly so the
variables can all be const.
Inspired by similar changes in grsecurity/PaX.
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jens Axboe <axboe@fb.com>
|
|
Instead of keeping two levels of indirection for requests types, fold it
all into the operations. The little caveat here is that previously
cmd_type only applied to struct request, while the request and bio op
fields were set to plain REQ_OP_READ/WRITE even for passthrough
operations.
Instead this patch adds new REQ_OP_* for SCSI passthrough and driver
private requests, althought it has to add two for each so that we
can communicate the data in/out nature of the request.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
|
|
This was entirely automated, using the script by Al:
PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*<asm/uaccess.h>'
sed -i -e "s!$PATT!#include <linux/uaccess.h>!" \
$(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h)
to do the replacement at the end of the merge window.
Requested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
sr_pm_ops, of type struct dev_pm_ops, is never modified, so declare it
as const.
Done with the help of Coccinelle.
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
|
|
For block drivers that specify a parent device, convert them to use
device_add_disk().
This conversion was done with the following semantic patch:
@@
struct gendisk *disk;
expression E;
@@
- disk->driverfs_dev = E;
...
- add_disk(disk);
+ device_add_disk(E, disk);
@@
struct gendisk *disk;
expression E1, E2;
@@
- disk->driverfs_dev = E1;
...
E2 = disk;
...
- add_disk(E2);
+ device_add_disk(E1, E2);
...plus some manual fixups for a few missed conversions.
Cc: Jens Axboe <axboe@fb.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: James Bottomley <James.Bottomley@hansenpartnership.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
|
|
Runtime suspend during driver probe and removal can cause problems.
The driver's runtime_suspend or runtime_resume callbacks may invoked
before the driver has finished binding to the device or after the
driver has unbound from the device.
This problem shows up with the sd and sr drivers, and can cause disk
or CD/DVD drives to become unusable as a result. The fix is simple.
The drivers store a pointer to the scsi_disk or scsi_cd structure as
their private device data when probing is finished, so we simply have
to be sure to clear the private data during removal and test it during
runtime suspend/resume.
This fixes <https://bugs.debian.org/801925>.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-by: Paul Menzel <paul.menzel@giantmonkey.de>
Reported-by: Erich Schubert <erich@debian.org>
Reported-by: Alexandre Rossi <alexandre.rossi@gmail.com>
Tested-by: Paul Menzel <paul.menzel@giantmonkey.de>
Tested-by: Erich Schubert <erich@debian.org>
CC: <stable@vger.kernel.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
|
|
The driver core driver structure has grown an owner field and now
requires it to be set for all modular drivers. Set it up for
all scsi_driver instances and get rid of the now superflous
scsi_driver owner field.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Shane M Seymour <shane.seymour@hp.com>
Reviewed-by: Ewan D. Milne <emilne@redhat.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
|
|
There is no reason for ULDs to pass in a flag on how to allocate the S/G
lists. While we don't need GFP_ATOMIC for the blk-mq case because we
don't hold locks, that decision can be made way down the chain without
having to pass a pointless gfp_mask argument.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
|
|
The calling conventions for this function are bad as it could return
-ENODEV both for a device not currently online and a not recognized ioctl.
Add a new scsi_ioctl_block_when_processing_errors function that wraps
scsi_block_when_processing_errors with the a special case for the
SG_SCSI_RESET ioctl command, and handle the SG_SCSI_RESET case itself
in scsi_ioctl. All callers of scsi_ioctl now must call the above helper
to check for the EH state, so that the ioctl handler itself doesn't
have to.
Reported-by: Robert Elliott <Elliott@hp.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
|
|
SCSI Well-known logical units generally don't have any scsi driver
associated with it which means no one will call scsi_autopm_put_device()
on these wlun scsi devices and this would result in keeping the
corresponding scsi device always active (hence LLD can't be suspended as
well). Same exact problem can be seen for other scsi device representing
normal logical unit whose driver is yet to be loaded. This patch fixes
the above problem with this approach:
- make the scsi_autopm_put_device call at the end of scsi_sysfs_add_sdev
to make it balance out the get earlier in the function.
- let drivers do paired get/put calls in their probe methods.
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Dolev Raviv <draviv@codeaurora.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
|
|
We currently set the field in common code based on the device type,
but then only use it in the cdrom driver which also overrides the
value previously set in the generic code.
Just leave this entirely to the CDROM driver to make everyones life
simpler.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
|
|
The data direction fiel in the SCSI command is derived only from the block
request structure. Move setting it up into common code instead of
duplicating it in the ULDs.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
|
|
We should call the device handler prep_fn for all TYPE_FS requests,
not just simple read/write calls that are handled by the disk driver.
Restructure the common I/O code to call the prep_fn handler and zero
out the CDB, and just leave the call to scsi_init_io to the ULDs.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
|
|
Update the sr driver to use dev_printk() variants instead of
plain printk(); this will prefix logging messages with the
appropriate device.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
|
|
Instead of letting the ULD play games with the prep_fn move back to
the model of a central prep_fn with a callback to the ULD. This
already cleans up and shortens the code by itself, and will be required
to properly support blk-mq in the SCSI midlayer.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Nicholas Bellinger <nab@linux-iscsi.org>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Reviewed-by: Hannes Reinecke <hare@suse.de>
|
|
Migrate sr to make use of block layer runtime PM. Accordingly, the
SCSI bus layer runtime PM callback is simplified as all SCSI drivers
implementing runtime PM now use the block layer's request-based
mechanism.
Note that due to the device will be polled by kernel at a constant
interval, if the autosuspend delay is set longer than the polling
interval then the device will never suspend.
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
|
|
The value passed is 0 in all but "it can never happen" cases (and those
only in a couple of drivers) *and* it would've been lost on the way
out anyway, even if something tried to pass something meaningful.
Just don't bother.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
|
When the ODD is powered off, any action the user did to the ODD that
would generate a media event will trigger an ACPI interrupt, so the
poll for media event is no longer necessary. And the poll will also
cause a runtime status change, which will stop the ODD from staying in
powered off state, so the poll should better be stopped.
But since we don't have access to the gendisk structure in LLDs, here
comes the disk_events_disable_depth for scsi device. This field is a
hint set by LLDs to convey information to upper layer drivers. A value
of 0 means media poll is necessary for the device, while values above 0
means media poll is not needed and should better be skipped. So we can
increase its value when we are to power off the ODD in ATA layer and
decrease its value when the ODD is powered on, effectively silence the
media events poll.
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
|
|
This patch adds runtime pm support for sr.
It did this by increasing the runtime usage_count of the device when
its block device is accessed. And decreasing the runtime usage_count
of the device when the access is done.
If there is media inside, runtime suspend is not allowed as we don't
always know if the ODD is being used or not.
The idea is discussed here:
http://thread.gmane.org/gmane.linux.acpi.devel/55243/focus=52703
and the restriction to check media inside is discussed here:
http://thread.gmane.org/gmane.linux.ide/53665/focus=58836
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
|
|
Some broken devices indicates that media has changed on every
GET_EVENT_STATUS_NOTIFICATION. This translates into MEDIA_CHANGE
uevent on every open() which lets udev run into a loop.
Verify GET_EVENT result against TUR and if it generates spurious
events for several times in a row, ignore the GET_EVENT events, and
trust only the TUR status.
This is the log of a USB stick with a (broken) fake CDROM drive:
scsi 5:0:0:0: Direct-Access SanDisk U3 Cruzer Micro 8.02 PQ: 0 ANSI: 0 CCS
sd 5:0:0:0: Attached scsi generic sg3 type 0
scsi 5:0:0:1: CD-ROM SanDisk U3 Cruzer Micro 8.02 PQ: 0 ANSI: 0
sd 5:0:0:0: [sdb] Attached SCSI removable disk
sr2: scsi3-mmc drive: 48x/48x tray
sr 5:0:0:1: Attached scsi CD-ROM sr2
sr 5:0:0:1: Attached scsi generic sg4 type 5
sr2: GET_EVENT and TUR disagree continuously, suppress GET_EVENT events
sd 5:0:0:0: [sdb] 31777279 512-byte logical blocks: (16.2 GB/15.1 GiB)
sd 5:0:0:0: [sdb] No Caching mode page present
sd 5:0:0:0: [sdb] Assuming drive cache: write through
sd 5:0:0:0: [sdb] No Caching mode page present
sd 5:0:0:0: [sdb] Assuming drive cache: write through
sdb: sdb1
-tj: Updated to consider only spurious GET_EVENT events among
different types of disagreement and allow using TUR for kernel
event polling after GET_EVENT is ignored.
Reported-By: Markus Rathgeb maggu2810@googlemail.com
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: stable@kernel.org # >= v2.6.38, fixes udev busy looping w/ certain devices
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
|
|
Disk event code automatically blocks events on excl write. This is
primarily to avoid issuing polling commands while burning is in
progress. This behavior doesn't fit other types of devices with
removeable media where polling commands don't have adverse side
effects and door locking usually doesn't exist.
This patch introduces new genhd flag which controls the auto-blocking
behavior and uses it to enable auto-blocking only on optical devices.
Note for stable: 2.6.38 and later only
Cc: stable@kernel.org
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
|
|
Fixes generated by 'codespell' and manually reviewed.
Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
|
|
SDEV_MEDIA_CHANGE event was first added by commit a341cd0f (SCSI: add
asynchronous event notification API) for SATA AN support and then
extended to cover generic media change events by commit 285e9670
([SCSI] sr,sd: send media state change modification events).
This event was mapped to block device in userland with all properties
stripped to simulate CHANGE event on the block device, which, in turn,
was used to trigger further userspace action on media change.
The recent addition of disk event framework kept this event for
backward compatibility but it turns out to be unnecessary and causes
erratic and inefficient behavior. The new disk event generates proper
events on the block devices and the compat events are mapped to block
device with all properties stripped, so the block device ends up
generating multiple duplicate events for single actual event.
This patch removes the compat event generation from both sr and sd as
suggested by Kay Sievers. Both existing and newer versions of udev
and the associated tools will behave better with the removal of these
events as they from the beginning were expecting events on the block
devices.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
|
|
Replace sr_media_change() with sr_check_events(). It normally only
uses GET_EVENT_STATUS_NOTIFICATION to check both media change and
eject request. If @clearing includes DISK_EVENT_MEDIA_CHANGE, it
issues TUR and compares whether media presence has changed. The SCSI
specific media change uevent is kept for compatibility.
sr_media_change() was doing both media change check and revalidation.
The revalidation part is split into sr_block_revalidate_disk().
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
|
|
The usage of TUR has been confusing involving several different
commits updating different parts over time. Currently, the only
differences between scsi_test_unit_ready() and sr_test_unit_ready()
are,
* scsi_test_unit_ready() also sets sdev->changed on NOT_READY.
* scsi_test_unit_ready() returns 0 if TUR ended with UNIT_ATTENTION or
NOT_READY.
Due to the above two differences, sr is using its own
sr_test_unit_ready(), but sd - the sole user of the above extra
handling - doesn't even need them.
Where scsi_test_unit_ready() is used in sd_media_changed(), the code
is looking for device ready w/ media present state which is true iff
TUR succeeds w/o sense data or UA, and when the device is not ready
for whatever reason sd_media_changed() explicitly marks media as
missing so there's no reason to set sdev->changed automatically from
scsi_test_unit_ready() on NOT_READY.
Drop both special handlings from scsi_test_unit_ready(), which makes
it equivalant to sr_test_unit_ready(), and replace
sr_test_unit_ready() with scsi_test_unit_ready(). Also, drop the
unnecessary explicit NOT_READY check from sd_media_changed().
Checking return value is enough for testing device readiness.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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