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authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2016-09-20 17:56:28 +0300
committerThomas Gleixner <tglx@linutronix.de>2016-09-20 17:59:21 +0300
commit5372e054a1928fe704cf0a5e2e139645a777b50a (patch)
treef49d3bbc2ac21e1dc537277eb3a40e9ca37ff654 /drivers/cpufreq
parentb067a7be411ccb31b6cc866fc213670c3acf4001 (diff)
downloadlinux-5372e054a1928fe704cf0a5e2e139645a777b50a.tar.xz
cpufreq: Fix up conversion to hotplug state machine
The function cpufreq_register_driver() returns zero on success and since commit 27622b061eb4 ("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: 27622b061eb4 ("cpufreq: Convert to hotplug state machine") Reported-by: Borislav Petkov <bp@alien8.de> Reported-and-tested-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: peterz@infradead.org Cc: rjw@rjwysocki.net Link: http://lkml.kernel.org/r/20160920145628.lp2bmq72ip3oiash@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/cpufreq.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index e0bc632a259e..8b44de4d7438 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -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;