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Drivers: hv: vmbus: Fix a bug in hv_need_to_signal()

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As part of updating the vmbus protocol, the function hv_need_to_signal()
was introduced. This functions helps optimize signalling from guest to
host. The newly added memory barrier is needed to ensure that we correctly
decide when to signal the host.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Reported-by: Olaf Hering <olh@suse.de>
Cc: Stable <stable@vger.kernel.org>  (V3.8+)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
K. Y. Srinivasan 2013-03-29 14:30:38 -07:00 committed by Greg Kroah-Hartman
parent 945480b159
commit 288fa3e022
1 changed files with 1 additions and 0 deletions
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drivers/hv/ring_buffer.c
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@ -71,6 +71,7 @@ u32 hv_end_read(struct hv_ring_buffer_info *rbi)
static bool hv_need_to_signal(u32 old_write, struct hv_ring_buffer_info *rbi)
{
smp_mb();
if (rbi->ring_buffer->interrupt_mask)
return false;