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| author | Nishanth Menon <nm@ti.com> | 2013-01-18 19:52:32 +0000 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-01-22 13:28:39 +0100 |
| commit | f44d188acdca1a34e4439ca6a173f85086e0e655 (patch) | |
| tree | af5fe5cd356ec1ee834dd1125b6bdc408402bd2f /drivers/cpufreq/omap-cpufreq.c | |
| parent | 25216865392a6e1f3032855aee7407de1fe0b70c (diff) | |
| download | linux-f44d188acdca1a34e4439ca6a173f85086e0e655.tar.gz linux-f44d188acdca1a34e4439ca6a173f85086e0e655.tar.bz2 linux-f44d188acdca1a34e4439ca6a173f85086e0e655.zip | |
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 <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>
Diffstat (limited to 'drivers/cpufreq/omap-cpufreq.c')
| -rw-r--r-- | drivers/cpufreq/omap-cpufreq.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/cpufreq/omap-cpufreq.c b/drivers/cpufreq/omap-cpufreq.c index 1f3417a8322d..97102b05843f 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); } |