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| author | Jia-Ju Bai | 2018-01-26 09:48:49 +0100 |
|---|---|---|
| committer | Viresh Kumar | 2018-02-12 10:37:46 +0100 |
| commit | 4a823c0be80fa996234ebb41c80d40458b1bec1e (patch) | |
| tree | 114225c53980159bfb8c69957983bf5ad31dd8d7 /drivers/opp/cpu.c | |
| parent | Linux 4.16-rc1 (diff) | |
| download | kernel-qcow2-linux-4a823c0be80fa996234ebb41c80d40458b1bec1e.tar.gz kernel-qcow2-linux-4a823c0be80fa996234ebb41c80d40458b1bec1e.tar.xz kernel-qcow2-linux-4a823c0be80fa996234ebb41c80d40458b1bec1e.zip | |
opp: cpu: Replace GFP_ATOMIC with GFP_KERNEL in dev_pm_opp_init_cpufreq_table
After checking all possible call chains to
dev_pm_opp_init_cpufreq_table() here,
my tool finds that this function is never called in atomic context,
namely never in an interrupt handler or holding a spinlock.
And dev_pm_opp_init_cpufreq_table() calls dev_pm_opp_get_opp_count(),
which calls mutex_lock that can sleep.
It indicates that atmtcp_v_send() can call functions which may sleep.
Thus GFP_ATOMIC is not necessary, and it can be replaced with GFP_KERNEL.
This is found by a static analysis tool named DCNS written by myself.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'drivers/opp/cpu.c')
| -rw-r--r-- | drivers/opp/cpu.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/opp/cpu.c b/drivers/opp/cpu.c index 2d87bc1adf38..0c0910709435 100644 --- a/drivers/opp/cpu.c +++ b/drivers/opp/cpu.c @@ -55,7 +55,7 @@ int dev_pm_opp_init_cpufreq_table(struct device *dev, if (max_opps <= 0) return max_opps ? max_opps : -ENODATA; - freq_table = kcalloc((max_opps + 1), sizeof(*freq_table), GFP_ATOMIC); + freq_table = kcalloc((max_opps + 1), sizeof(*freq_table), GFP_KERNEL); if (!freq_table) return -ENOMEM; |