This is a note to let you know that I've just added the patch titled
ACPI / EC: Ensure lock is acquired before accessing ec struct members
to the 3.12-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:
acpi-ec-ensure-lock-is-acquired-before-accessing-ec-struct-members.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 36b15875a7819a2ec4cb5748ff7096ad7bd86cbb Mon Sep 17 00:00:00 2001
From: Puneet Kumar <puneetster@xxxxxxxxxxxx>
Date: Fri, 15 Nov 2013 11:41:29 -0800
Subject: ACPI / EC: Ensure lock is acquired before accessing ec struct members
From: Puneet Kumar <puneetster@xxxxxxxxxxxx>
commit 36b15875a7819a2ec4cb5748ff7096ad7bd86cbb upstream.
A bug was introduced by commit b76b51ba0cef ('ACPI / EC: Add more debug
info and trivial code cleanup') that erroneously caused the struct member
to be accessed before acquiring the required lock. This change fixes
it by ensuring the lock acquisition is done first.
Found by Aaron Durbin <adurbin@xxxxxxxxxxxx>
Fixes: b76b51ba0cef ('ACPI / EC: Add more debug info and trivial code cleanup')
References: http://crbug.com/319019
Signed-off-by: Puneet Kumar <puneetster@xxxxxxxxxxxx>
Reviewed-by: Aaron Durbin <adurbin@xxxxxxxxxxxx>
[olof: Commit message reworded a bit]
Signed-off-by: Olof Johansson <olof@xxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/acpi/ec.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -175,9 +175,10 @@ static void start_transaction(struct acp
static void advance_transaction(struct acpi_ec *ec, u8 status)
{
unsigned long flags;
- struct transaction *t = ec->curr;
+ struct transaction *t;
spin_lock_irqsave(&ec->lock, flags);
+ t = ec->curr;
if (!t)
goto unlock;
if (t->wlen > t->wi) {
Patches currently in stable-queue which might be from puneetster@xxxxxxxxxxxx are
queue-3.12/acpi-ec-ensure-lock-is-acquired-before-accessing-ec-struct-members.patch
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