diff options
| author | Olaf Hering <olaf@aepfle.de> | 2011-03-21 14:41:37 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-04-04 21:33:25 -0700 |
| commit | 22356585712d1ff08fbfed152edd8b386873b238 (patch) | |
| tree | aeb0a6192077d4865d06f6b35cdbf789b390ca99 | |
| parent | 75e4fb221babbe329c1aba8c34092d29034f1545 (diff) | |
staging: hv: use sync_bitops when interacting with the hypervisor
Locking is required when tweaking bits located in a shared page, use the
sync_ version of bitops. Without this change vmbus_on_event() will miss
events and as a result, vmbus_isr() will not schedule the receive tasklet.
Signed-off-by: Olaf Hering <olaf@aepfle.de>
Cc: stable <stable@kernel.org>
Acked-by: Haiyang Zhang <haiyangz@microsoft.com>
Acked-by: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/staging/hv/channel.c | 8 | ||||
| -rw-r--r-- | drivers/staging/hv/connection.c | 4 | ||||
| -rw-r--r-- | drivers/staging/hv/vmbus_drv.c | 2 | ||||
| -rw-r--r-- | drivers/staging/hv/vmbus_private.h | 1 |
4 files changed, 8 insertions, 7 deletions
diff --git a/drivers/staging/hv/channel.c b/drivers/staging/hv/channel.c index 775a52a91222..f7ce7d2494b3 100644 --- a/drivers/staging/hv/channel.c +++ b/drivers/staging/hv/channel.c @@ -81,14 +81,14 @@ static void vmbus_setevent(struct vmbus_channel *channel) if (channel->offermsg.monitor_allocated) { /* Each u32 represents 32 channels */ - set_bit(channel->offermsg.child_relid & 31, + sync_set_bit(channel->offermsg.child_relid & 31, (unsigned long *) vmbus_connection.send_int_page + (channel->offermsg.child_relid >> 5)); monitorpage = vmbus_connection.monitor_pages; monitorpage++; /* Get the child to parent monitor page */ - set_bit(channel->monitor_bit, + sync_set_bit(channel->monitor_bit, (unsigned long *)&monitorpage->trigger_group [channel->monitor_grp].pending); @@ -104,7 +104,7 @@ static void VmbusChannelClearEvent(struct vmbus_channel *channel) if (Channel->offermsg.monitor_allocated) { /* Each u32 represents 32 channels */ - clear_bit(Channel->offermsg.child_relid & 31, + sync_clear_bit(Channel->offermsg.child_relid & 31, (unsigned long *)vmbus_connection.send_int_page + (Channel->offermsg.child_relid >> 5)); @@ -112,7 +112,7 @@ static void VmbusChannelClearEvent(struct vmbus_channel *channel) vmbus_connection.monitor_pages; monitorPage++; /* Get the child to parent monitor page */ - clear_bit(Channel->monitor_bit, + sync_clear_bit(Channel->monitor_bit, (unsigned long *)&monitorPage->trigger_group [Channel->monitor_grp].Pending); } diff --git a/drivers/staging/hv/connection.c b/drivers/staging/hv/connection.c index 44b203b95a22..afc8116e7aa4 100644 --- a/drivers/staging/hv/connection.c +++ b/drivers/staging/hv/connection.c @@ -296,7 +296,7 @@ void vmbus_on_event(unsigned long data) for (dword = 0; dword < maxdword; dword++) { if (recv_int_page[dword]) { for (bit = 0; bit < 32; bit++) { - if (test_and_clear_bit(bit, + if (sync_test_and_clear_bit(bit, (unsigned long *) &recv_int_page[dword])) { relid = (dword << 5) + bit; @@ -338,7 +338,7 @@ int vmbus_post_msg(void *buffer, size_t buflen) int vmbus_set_event(u32 child_relid) { /* Each u32 represents 32 channels */ - set_bit(child_relid & 31, + sync_set_bit(child_relid & 31, (unsigned long *)vmbus_connection.send_int_page + (child_relid >> 5)); diff --git a/drivers/staging/hv/vmbus_drv.c b/drivers/staging/hv/vmbus_drv.c index b473f468dd83..79089f85d903 100644 --- a/drivers/staging/hv/vmbus_drv.c +++ b/drivers/staging/hv/vmbus_drv.c @@ -254,7 +254,7 @@ static int vmbus_on_isr(void) event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT; /* Since we are a child, we only need to check bit 0 */ - if (test_and_clear_bit(0, (unsigned long *) &event->flags32[0])) { + if (sync_test_and_clear_bit(0, (unsigned long *) &event->flags32[0])) { DPRINT_DBG(VMBUS, "received event %d", event->flags32[0]); ret |= 0x2; } diff --git a/drivers/staging/hv/vmbus_private.h b/drivers/staging/hv/vmbus_private.h index ca050a499b99..6f0d8df5e178 100644 --- a/drivers/staging/hv/vmbus_private.h +++ b/drivers/staging/hv/vmbus_private.h @@ -31,6 +31,7 @@ #include "channel_mgmt.h" #include "ring_buffer.h" #include <linux/list.h> +#include <asm/sync_bitops.h> /* |