diff options
| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-08-16 22:06:55 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-04-14 06:44:17 -0700 |
| commit | 6535fb1535c0053ac22c2ed5c20b9465f30a523e (patch) | |
| tree | 32297889e8152aef2e9ef1dc11bf3c18254cfbe8 /drivers/idle | |
| parent | 23a5a7a2dafd877ec853b4c7debf6d726d10f9b9 (diff) | |
intel_idle: Check cpu_idle_get_driver() for NULL before dereferencing it.
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@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>
Cc: Daniel Kiper <daniel.kiper@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/idle')
| -rw-r--r-- | drivers/idle/intel_idle.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index 8d1ebd332292..014364ab689b 100644 --- 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; } |