diff options
| author | Douglas Anderson <dianders@chromium.org> | 2020-05-04 10:50:17 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-06-20 10:25:19 +0200 |
| commit | f3ba3399626e8ec5fe6c95c667e36f0bf4a9894e (patch) | |
| tree | ce5afd53921c1321f20259b3e2157277e60dff5d | |
| parent | 6cb89d191b9beed523046b2c8e9265ff5d91bf1a (diff) | |
| download | omap-f3ba3399626e8ec5fe6c95c667e36f0bf4a9894e.tar.gz | |
kernel/cpu_pm: Fix uninitted local in cpu_pm
commit b5945214b76a1f22929481724ffd448000ede914 upstream.
cpu_pm_notify() is basically a wrapper of notifier_call_chain().
notifier_call_chain() doesn't initialize *nr_calls to 0 before it
starts incrementing it--presumably it's up to the callers to do this.
Unfortunately the callers of cpu_pm_notify() don't init *nr_calls.
This potentially means you could get too many or two few calls to
CPU_PM_ENTER_FAILED or CPU_CLUSTER_PM_ENTER_FAILED depending on the
luck of the stack.
Let's fix this.
Fixes: ab10023e0088 ("cpu_pm: Add cpu power management notifiers")
Cc: stable@vger.kernel.org
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20200504104917.v6.3.I2d44fc0053d019f239527a4e5829416714b7e299@changeid
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | kernel/cpu_pm.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/cpu_pm.c b/kernel/cpu_pm.c index 67b02e138a47..2ed6351e2a7e 100644 --- a/kernel/cpu_pm.c +++ b/kernel/cpu_pm.c @@ -89,7 +89,7 @@ EXPORT_SYMBOL_GPL(cpu_pm_unregister_notifier); */ int cpu_pm_enter(void) { - int nr_calls; + int nr_calls = 0; int ret = 0; ret = cpu_pm_notify(CPU_PM_ENTER, -1, &nr_calls); @@ -140,7 +140,7 @@ EXPORT_SYMBOL_GPL(cpu_pm_exit); */ int cpu_cluster_pm_enter(void) { - int nr_calls; + int nr_calls = 0; int ret = 0; ret = cpu_pm_notify(CPU_CLUSTER_PM_ENTER, -1, &nr_calls); |