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PM: sleep: stats: Use locking in dpm_save_failed_dev() 

Because dpm_save_failed_dev() may be called simultaneously by multiple
failing device PM functions, the state of the suspend_stats fields
updated by it may become inconsistent.

Prevent that from happening by using a lock in dpm_save_failed_dev().

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Rafael J. Wysocki 2024-01-29 17:24:30 +01:00
parent 4add3e72f0
commit a6d38e991d
1 changed files with 5 additions and 0 deletions
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5
kernel/power/main.c
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@ -325,13 +325,18 @@ struct suspend_stats {
};
static struct suspend_stats suspend_stats;
static DEFINE_MUTEX(suspend_stats_lock);
void dpm_save_failed_dev(const char *name)
{
mutex_lock(&suspend_stats_lock);
strscpy(suspend_stats.failed_devs[suspend_stats.last_failed_dev],
name, sizeof(suspend_stats.failed_devs[0]));
suspend_stats.last_failed_dev++;
suspend_stats.last_failed_dev %= REC_FAILED_NUM;
mutex_unlock(&suspend_stats_lock);
}
void dpm_save_failed_step(enum suspend_stat_step step)