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author | Javi Merino <javi.merino@arm.com> | 2015-08-17 19:21:42 +0100 |
---|---|---|
committer | Eduardo Valentin <edubezval@gmail.com> | 2015-09-13 20:33:17 -0700 |
commit | 459ac37506d195713b5e82271a2ac44a777e47df (patch) | |
tree | 7a3071c20fcaa2b5d11b452b1969359ac722b5e6 | |
parent | 0847e26a84faa0fcb4572d7e42d0a44cab69a83d (diff) | |
download | op-kernel-dev-459ac37506d195713b5e82271a2ac44a777e47df.zip op-kernel-dev-459ac37506d195713b5e82271a2ac44a777e47df.tar.gz |
thermal: cpu_cooling: don't call kcalloc() under rcu_read_lock
build_dyn_power_table() allocates the power table while holding
rcu_read_lock. kcalloc using GFP_KERNEL may sleep, so it can't be
called in an RCU read-side path.
Move the rcu protection to the part of the function that really needs
it: the part that handles the dev_pm_opp pointer received from
dev_pm_opp_find_freq_ceil(). In the unlikely case that there is an OPP
added to the cpu while this function is running, return -EAGAIN.
Fixes: c36cf0717631 ("thermal: cpu_cooling: implement the power cooling device API")
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Eduardo Valentin <edubezval@gmail.com>
Signed-off-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
-rw-r--r-- | drivers/thermal/cpu_cooling.c | 47 |
1 files changed, 23 insertions, 24 deletions
diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c index 620dcd4..b327556 100644 --- a/drivers/thermal/cpu_cooling.c +++ b/drivers/thermal/cpu_cooling.c @@ -262,7 +262,9 @@ static int cpufreq_thermal_notifier(struct notifier_block *nb, * efficiently. Power is stored in mW, frequency in KHz. The * resulting table is in ascending order. * - * Return: 0 on success, -E* on error. + * Return: 0 on success, -EINVAL if there are no OPPs for any CPUs, + * -ENOMEM if we run out of memory or -EAGAIN if an OPP was + * added/enabled while the function was executing. */ static int build_dyn_power_table(struct cpufreq_cooling_device *cpufreq_device, u32 capacitance) @@ -270,11 +272,9 @@ static int build_dyn_power_table(struct cpufreq_cooling_device *cpufreq_device, struct power_table *power_table; struct dev_pm_opp *opp; struct device *dev = NULL; - int num_opps = 0, cpu, i, ret = 0; + int num_opps = 0, cpu, i; unsigned long freq; - rcu_read_lock(); - for_each_cpu(cpu, &cpufreq_device->allowed_cpus) { dev = get_cpu_device(cpu); if (!dev) { @@ -284,24 +284,20 @@ static int build_dyn_power_table(struct cpufreq_cooling_device *cpufreq_device, } num_opps = dev_pm_opp_get_opp_count(dev); - if (num_opps > 0) { + if (num_opps > 0) break; - } else if (num_opps < 0) { - ret = num_opps; - goto unlock; - } + else if (num_opps < 0) + return num_opps; } - if (num_opps == 0) { - ret = -EINVAL; - goto unlock; - } + if (num_opps == 0) + return -EINVAL; power_table = kcalloc(num_opps, sizeof(*power_table), GFP_KERNEL); - if (!power_table) { - ret = -ENOMEM; - goto unlock; - } + if (!power_table) + return -ENOMEM; + + rcu_read_lock(); for (freq = 0, i = 0; opp = dev_pm_opp_find_freq_ceil(dev, &freq), !IS_ERR(opp); @@ -309,6 +305,11 @@ static int build_dyn_power_table(struct cpufreq_cooling_device *cpufreq_device, u32 freq_mhz, voltage_mv; u64 power; + if (i >= num_opps) { + rcu_read_unlock(); + return -EAGAIN; + } + freq_mhz = freq / 1000000; voltage_mv = dev_pm_opp_get_voltage(opp) / 1000; @@ -326,18 +327,16 @@ static int build_dyn_power_table(struct cpufreq_cooling_device *cpufreq_device, power_table[i].power = power; } - if (i == 0) { - ret = PTR_ERR(opp); - goto unlock; - } + rcu_read_unlock(); + + if (i != num_opps) + return PTR_ERR(opp); cpufreq_device->cpu_dev = dev; cpufreq_device->dyn_power_table = power_table; cpufreq_device->dyn_power_table_entries = i; -unlock: - rcu_read_unlock(); - return ret; + return 0; } static u32 cpu_freq_to_power(struct cpufreq_cooling_device *cpufreq_device, |