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| author | Jia-Ju Bai <baijiaju1990@gmail.com> | 2018-01-26 16:48:49 +0800 |
|---|---|---|
| committer | Viresh Kumar <viresh.kumar@linaro.org> | 2018-02-12 15:07:46 +0530 |
| commit | 4a823c0be80fa996234ebb41c80d40458b1bec1e (patch) | |
| tree | 114225c53980159bfb8c69957983bf5ad31dd8d7 /drivers/opp/cpu.c | |
| parent | 7928b2cbe55b2a410a0f5c1f154610059c57b1b2 (diff) | |
| download | linux-4a823c0be80fa996234ebb41c80d40458b1bec1e.tar.gz | |
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; |