From f44d188acdca1a34e4439ca6a173f85086e0e655 Mon Sep 17 00:00:00 2001 From: Nishanth Menon Date: Fri, 18 Jan 2013 19:52:32 +0000 Subject: [PATCH] cpufreq: OMAP: use RCU locks around usage of OPP OPP pointer is RCU protected, hence after finding it, de-reference also should be protected with the same RCU context else the OPP pointer may become invalid. Reported-by: Alexander Holler Tested-by: Alexander Holler Acked-by: Alexander Holler Signed-off-by: Nishanth Menon Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/omap-cpufreq.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/cpufreq/omap-cpufreq.c b/drivers/cpufreq/omap-cpufreq.c index 1f3417a..97102b0 100644 --- a/drivers/cpufreq/omap-cpufreq.c +++ b/drivers/cpufreq/omap-cpufreq.c @@ -110,13 +110,16 @@ static int omap_target(struct cpufreq_policy *policy, freq = ret; if (mpu_reg) { + rcu_read_lock(); opp = opp_find_freq_ceil(mpu_dev, &freq); if (IS_ERR(opp)) { + rcu_read_unlock(); dev_err(mpu_dev, "%s: unable to find MPU OPP for %d\n", __func__, freqs.new); return -EINVAL; } volt = opp_get_voltage(opp); + rcu_read_unlock(); tol = volt * OPP_TOLERANCE / 100; volt_old = regulator_get_voltage(mpu_reg); } -- 2.7.4