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intel_idle: Check cpu_idle_get_driver() for NULL before dereferencing it. 

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@internecto.net>
Suggested-by: Jan Beulich <JBeulich@suse.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Konrad Rzeszutek Wilk 2012-08-16 22:06:55 +02:00 committed by Rafael J. Wysocki
parent 5fbbb90dfd
commit 3735d524da
1 changed files with 2 additions and 1 deletions
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3
drivers/idle/intel_idle.c
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@ -606,8 +606,9 @@ 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;
}