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cpufreq: unlock when failing cpufreq_update_policy()

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Commit bd0fa9bb45 introduced a failure path to cpufreq_update_policy() if
cpufreq_driver->get(cpu) returns NULL.  However, it jumps to the 'no_policy'
label, which exits without unlocking any of the locks the function acquired
earlier.  This causes later calls into cpufreq to hang.

Fix this by creating a new 'unlock' label and jumping to that instead.

Fixes: bd0fa9bb45 ("cpufreq: Return error if ->get() failed in cpufreq_update_policy()")
Link: https://devtalk.nvidia.com/default/topic/751903/kernel-3-15-and-nv-drivers-337-340-failed-to-initialize-the-nvidia-kernel-module-gtx-550-ti-/
Signed-off-by: Aaron Plattner <aplattner@nvidia.com>
Cc: 3.15+ <stable@vger.kernel.org> # 3.15+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Aaron Plattner 2014-06-18 11:27:32 -07:00 committed by Rafael J. Wysocki
parent 51d211e9c3
commit fefa8ff810
1 changed files with 4 additions and 6 deletions
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10
drivers/cpufreq/cpufreq.c
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@ -2242,10 +2242,8 @@ int cpufreq_update_policy(unsigned int cpu)
struct cpufreq_policy new_policy;
int ret;
if (!policy) {
ret = -ENODEV;
goto no_policy;
}
if (!policy)
return -ENODEV;
down_write(&policy->rwsem);
@ -2264,7 +2262,7 @@ int cpufreq_update_policy(unsigned int cpu)
new_policy.cur = cpufreq_driver->get(cpu);
if (WARN_ON(!new_policy.cur)) {
ret = -EIO;
goto no_policy;
goto unlock;
}
if (!policy->cur) {
@ -2279,10 +2277,10 @@ int cpufreq_update_policy(unsigned int cpu)
ret = cpufreq_set_policy(policy, &new_policy);
unlock:
up_write(&policy->rwsem);
cpufreq_cpu_put(policy);
no_policy:
return ret;
}
EXPORT_SYMBOL(cpufreq_update_policy);