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cpufreq: Fix up conversion to hotplug state machine

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The function cpufreq_register_driver() returns zero on success and since
commit 27622b061e ("cpufreq: Convert to hotplug state machine")
erroneously a positive number. Due to the "if (x) assume_error" construct
all callers assumed an error and as a consequence the cpu freq kworker
crashes with a NULL pointer dereference.

Reset the return value back to zero in the success case.

Fixes: 27622b061e ("cpufreq: Convert to hotplug state machine")
Reported-by: Borislav Petkov <[email protected]>
Reported-and-tested-by: Ingo Molnar <[email protected]>
Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Sebastian Andrzej Siewior 2016-09-20 16:56:28 +02:00 • committed by Thomas Gleixner
commit 5372e054a1
1 changed files with 1 additions and 0 deletions
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1
drivers/cpufreq/cpufreq.c
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@ -2503,6 +2503,7 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data)
if (ret < 0)
goto err_if_unreg;
hp_online = ret;
ret = 0;
pr_debug("driver %s up and running\n", driver_data->name);
goto out;