This is a note to let you know that I've just added the patch titled
Drivers: hv: vmbus: Fix a bug in hv_need_to_signal()
to the 3.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drivers-hv-vmbus-fix-a-bug-in-hv_need_to_signal.patch
and it can be found in the queue-3.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 288fa3e022eb85fa151e0f9bcd15caeb81679af6 Mon Sep 17 00:00:00 2001
From: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
Date: Fri, 29 Mar 2013 14:30:38 -0700
Subject: Drivers: hv: vmbus: Fix a bug in hv_need_to_signal()
From: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
commit 288fa3e022eb85fa151e0f9bcd15caeb81679af6 upstream.
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@xxxxxxxxxxxxx>
Reviewed-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
Reported-by: Olaf Hering <olh@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hv/ring_buffer.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/hv/ring_buffer.c
+++ b/drivers/hv/ring_buffer.c
@@ -71,6 +71,7 @@ u32 hv_end_read(struct hv_ring_buffer_in
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;
Patches currently in stable-queue which might be from kys@xxxxxxxxxxxxx are
queue-3.9/drivers-hv-vmbus-fix-a-bug-in-hv_need_to_signal.patch
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