diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2012-01-12 11:47:24 -0800 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2012-02-29 15:27:09 -0600 |
| commit | 5d7f6d1071eadd020edb2cf366d358e0f6d0a0f9 (patch) | |
| tree | 4c3d4c7a22ee37a61edb12ab76f3a37ba685e8b6 /drivers/scsi/libsas/sas_init.c | |
| parent | ab5266335ba1a43461443f9823276a2b44dd1ba7 (diff) | |
[SCSI] libsas: fix sas_unregister_ports vs sas_drain_work
We need to hold drain_mutex across the unregistration as port down events
queue device removal as chained events, so we need to make sure no other
drainers are active.
[ 1118.673968] WARNING: at kernel/workqueue.c:996 __queue_work+0x11a/0x326()
[ 1118.681982] Hardware name: S2600CP
[ 1118.686193] Modules linked in: isci(-) libsas scsi_transport_sas nls_utf8
ipv6 uinput sg iTCO_wdt iTCO_vendor_support i2c_i801 i2c_core ioatdma dca
sd_mod sr_mod cdrom ahci libahci libata [last unloaded: scsi_transport_sas]
[ 1118.709893] Pid: 6831, comm: rmmod Not tainted 3.2.0-isci+ #1
[ 1118.716727] Call Trace:
[ 1118.719867] [<ffffffff8103e9f5>] warn_slowpath_common+0x85/0x9d
[ 1118.727000] [<ffffffff8103ea27>] warn_slowpath_null+0x1a/0x1c
[ 1118.733942] [<ffffffff81056d44>] __queue_work+0x11a/0x326
[ 1118.740481] [<ffffffff81056f99>] queue_work_on+0x1b/0x22
[ 1118.746925] [<ffffffff81057106>] queue_work+0x37/0x3e
[ 1118.753105] [<ffffffffa0120e05>] ? sas_discover_event+0x55/0x82 [libsas]
[ 1118.761094] [<ffffffff813217c3>] scsi_queue_work+0x42/0x44
[ 1118.767717] [<ffffffffa0120e19>] sas_discover_event+0x69/0x82 [libsas]
[ 1118.775509] [<ffffffffa0120f5b>] sas_unregister_dev+0xc3/0xcc [libsas]
[ 1118.783319] [<ffffffffa0120fae>] sas_unregister_domain_devices+0x4a/0xc8 [libsas]
[ 1118.792731] [<ffffffffa0120071>] sas_deform_port+0x60/0x1a6 [libsas]
[ 1118.800339] [<ffffffffa01201ea>] sas_unregister_ports+0x33/0x44 [libsas]
[ 1118.808342] [<ffffffffa011f7e5>] sas_unregister_ha+0x41/0x6b [libsas]
[ 1118.816055] [<ffffffffa0134055>] isci_unregister+0x22/0x4d [isci]
[ 1118.823384] [<ffffffffa0143040>] isci_pci_remove+0x2e/0x60 [isci]
Reported-by: Jacek Danecki <jacek.danecki@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/libsas/sas_init.c')
| -rw-r--r-- | drivers/scsi/libsas/sas_init.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/drivers/scsi/libsas/sas_init.c b/drivers/scsi/libsas/sas_init.c index dc93e1181469..09c14ca3fbd5 100644 --- a/drivers/scsi/libsas/sas_init.c +++ b/drivers/scsi/libsas/sas_init.c @@ -160,18 +160,22 @@ Undo_phys: int sas_unregister_ha(struct sas_ha_struct *sas_ha) { - unsigned long flags; - /* Set the state to unregistered to avoid further unchained - * events to be queued + * events to be queued, and flush any in-progress drainers */ - spin_lock_irqsave(&sas_ha->state_lock, flags); + mutex_lock(&sas_ha->drain_mutex); + spin_lock_irq(&sas_ha->state_lock); clear_bit(SAS_HA_REGISTERED, &sas_ha->state); - spin_unlock_irqrestore(&sas_ha->state_lock, flags); - sas_drain_work(sas_ha); + spin_unlock_irq(&sas_ha->state_lock); + __sas_drain_work(sas_ha); + mutex_unlock(&sas_ha->drain_mutex); sas_unregister_ports(sas_ha); - sas_drain_work(sas_ha); + + /* flush unregistration work */ + mutex_lock(&sas_ha->drain_mutex); + __sas_drain_work(sas_ha); + mutex_unlock(&sas_ha->drain_mutex); if (sas_ha->lldd_max_execute_num > 1) { sas_shutdown_queue(sas_ha); |