This is a note to let you know that I've just added the patch titled
intel_idle: Check cpu_idle_get_driver() for NULL before dereferencing it.
to the 3.4-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:
intel_idle-check-cpu_idle_get_driver-for-null-before-dereferencing-it.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3735d524da64b70b41c764359da36f88aded3610 Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Thu, 16 Aug 2012 22:06:55 +0200
Subject: intel_idle: Check cpu_idle_get_driver() for NULL before dereferencing it.
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
commit 3735d524da64b70b41c764359da36f88aded3610 upstream.
If the machine is booted without any cpu_idle driver set
(b/c disable_cpuidle() has been called) we should follow
other users of cpu_idle API and check the return value
for NULL before using it.
Reported-and-tested-by: Mark van Dijk <mark@xxxxxxxxxxxxxx>
Suggested-by: Jan Beulich <JBeulich@xxxxxxxx>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
Cc: Daniel Kiper <daniel.kiper@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/idle/intel_idle.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -594,8 +594,9 @@ static int __init intel_idle_init(void)
intel_idle_cpuidle_driver_init();
retval = cpuidle_register_driver(&intel_idle_driver);
if (retval) {
+ struct cpuidle_driver *drv = cpuidle_get_driver();
printk(KERN_DEBUG PREFIX "intel_idle yielding to %s",
- cpuidle_get_driver()->name);
+ drv ? drv->name : "none");
return retval;
}
Patches currently in stable-queue which might be from konrad.wilk@xxxxxxxxxx are
queue-3.4/intel_idle-check-cpu_idle_get_driver-for-null-before-dereferencing-it.patch
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