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cpufreq: OMAP: use RCU locks around usage of OPP

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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 <holler@ahsoftware.de>
Tested-by: Alexander Holler <holler@ahsoftware.de>
Acked-by: Alexander Holler <holler@ahsoftware.de>
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Nishanth Menon 2013-01-18 19:52:32 +00:00 committed by Rafael J. Wysocki
parent 2521686539
commit f44d188acd
1 changed files with 3 additions and 0 deletions
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3
drivers/cpufreq/omap-cpufreq.c
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@ -110,13 +110,16 @@ static int omap_target(struct cpufreq_policy *policy,
freq = ret; freq = ret;
if (mpu_reg) { if (mpu_reg) {
rcu_read_lock();
opp = opp_find_freq_ceil(mpu_dev, &freq); opp = opp_find_freq_ceil(mpu_dev, &freq);
if (IS_ERR(opp)) { if (IS_ERR(opp)) {
rcu_read_unlock();
dev_err(mpu_dev, "%s: unable to find MPU OPP for %d\n", dev_err(mpu_dev, "%s: unable to find MPU OPP for %d\n",
__func__, freqs.new); __func__, freqs.new);
return -EINVAL; return -EINVAL;
} }
volt = opp_get_voltage(opp); volt = opp_get_voltage(opp);
rcu_read_unlock();
tol = volt * OPP_TOLERANCE / 100; tol = volt * OPP_TOLERANCE / 100;
volt_old = regulator_get_voltage(mpu_reg); volt_old = regulator_get_voltage(mpu_reg);
} }