cpufreq: Make cpufreq_quick_get() safe to call
authorRichard Cochran <rcochran@linutronix.de>
Fri, 11 Mar 2016 08:43:07 +0000 (09:43 +0100)
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>
Fri, 18 Mar 2016 00:49:01 +0000 (01:49 +0100)
commitc75361c0b08a59d3c9863a5a673ae039d5118c35
treed406a57cfcbdf87374400d333f28dc47b064db05
parent4fec7ad5f637159525265a45f66482cf8817b45f
cpufreq: Make cpufreq_quick_get() safe to call

The function, cpufreq_quick_get, accesses the global 'cpufreq_driver' and
its fields without taking the associated lock, cpufreq_driver_lock.

Without the locking, nothing guarantees that 'cpufreq_driver' remains
consistent during the call.  This patch fixes the issue by taking the lock
before accessing the data structure.

Signed-off-by: Richard Cochran <rcochran@linutronix.de>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
drivers/cpufreq/cpufreq.c