This is a note to let you know that I've just added the patch titled
Drivers: hv: hv_fcopy: fix a race condition for SMP guest
to the 3.15-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-hv_fcopy-fix-a-race-condition-for-smp-guest.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2ef82d24f445e82f80e235f44eb9d1bc933e3670 Mon Sep 17 00:00:00 2001
From: Dexuan Cui <decui@xxxxxxxxxxxxx>
Date: Wed, 16 Jul 2014 00:00:45 -0700
Subject: Drivers: hv: hv_fcopy: fix a race condition for SMP guest
From: Dexuan Cui <decui@xxxxxxxxxxxxx>
commit 2ef82d24f445e82f80e235f44eb9d1bc933e3670 upstream.
We should schedule the 5s "timer work" before starting the data transfer,
otherwise, the data transfer code may finish so fast on another
virtual cpu that when the code(fcopy_write()) trying to cancel the 5s
"timer work" can occasionally fail because the "timer work" may haven't
been scheduled yet and as a result the fcopy process will be aborted
wrongly by fcopy_work_func() in 5s.
Thank Liz Zhang <lizzha@xxxxxxxxxxxxx> for the initial investigation
on the bug.
This addresses https://bugzilla.redhat.com/show_bug.cgi?id=1118123
Tested-by: Liz Zhang <lizzha@xxxxxxxxxxxxx>
Cc: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
Signed-off-by: Dexuan Cui <decui@xxxxxxxxxxxxx>
Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hv/hv_fcopy.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/hv/hv_fcopy.c
+++ b/drivers/hv/hv_fcopy.c
@@ -246,8 +246,8 @@ void hv_fcopy_onchannelcallback(void *co
/*
* Send the information to the user-level daemon.
*/
- fcopy_send_data();
schedule_delayed_work(&fcopy_work, 5*HZ);
+ fcopy_send_data();
return;
}
icmsghdr->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE;
Patches currently in stable-queue which might be from decui@xxxxxxxxxxxxx are
queue-3.15/drivers-hv-hv_fcopy-fix-a-race-condition-for-smp-guest.patch
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