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Date: Wed, 11 Sep 2013 15:05:05 +0800 From: tianyu.lan@...el.com To: rjw@...k.pl, viresh.kumar@...aro.org, srivatsa.bhat@...ux.vnet.ibm.com Cc: Lan Tianyu <tianyu.lan@...el.com>, cpufreq@...r.kernel.org, linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH] Cpufreq: Acquire read lock in the cpufreq_policy_restore() rather than write lock From: Lan Tianyu <tianyu.lan@...el.com> In the cpufreq_policy_restore(), policy before system suspend is read from from percpu's cpufreq_cpu_data_fallback. It's read operation rather than write operation. So convert write lock to read lock Signed-off-by: Lan Tianyu <tianyu.lan@...el.com> --- drivers/cpufreq/cpufreq.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 81ceea6..b762f9b 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -912,11 +912,11 @@ static struct cpufreq_policy *cpufreq_policy_restore(unsigned int cpu) struct cpufreq_policy *policy; unsigned long flags; - write_lock_irqsave(&cpufreq_driver_lock, flags); + read_lock_irqsave(&cpufreq_driver_lock, flags); policy = per_cpu(cpufreq_cpu_data_fallback, cpu); - write_unlock_irqrestore(&cpufreq_driver_lock, flags); + read_unlock_irqrestore(&cpufreq_driver_lock, flags); return policy; } -- 1.8.4.rc0.1.g8f6a3e5.dirty -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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