This is a note to let you know that I've just added the patch titled
PM / QoS: fix wrong error-checking condition
to the 3.6-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:
pm-qos-fix-wrong-error-checking-condition.patch
and it can be found in the queue-3.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From a7227a0faa117d0bc532aea546ae5ac5f89e8ed7 Mon Sep 17 00:00:00 2001
From: Guennadi Liakhovetski <[email protected]>
Date: Fri, 23 Nov 2012 20:55:06 +0100
Subject: PM / QoS: fix wrong error-checking condition
From: Guennadi Liakhovetski <[email protected]>
commit a7227a0faa117d0bc532aea546ae5ac5f89e8ed7 upstream.
dev_pm_qos_add_request() can return 0, 1, or a negative error code,
therefore the correct error test is "if (error < 0)." Checking just for
non-zero return code leads to erroneous setting of the req->dev pointer
to NULL, which then leads to a repeated call to
dev_pm_qos_add_ancestor_request() in st1232_ts_irq_handler(). This in turn
leads to an Oops, when the I2C host adapter is unloaded and reloaded again
because of the inconsistent state of its QoS request list.
Signed-off-by: Guennadi Liakhovetski <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/base/power/qos.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/base/power/qos.c
+++ b/drivers/base/power/qos.c
@@ -451,7 +451,7 @@ int dev_pm_qos_add_ancestor_request(stru
if (ancestor)
error = dev_pm_qos_add_request(ancestor, req, value);
- if (error)
+ if (error < 0)
req->dev = NULL;
return error;
Patches currently in stable-queue which might be from [email protected] are
queue-3.6/pm-qos-fix-wrong-error-checking-condition.patch
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