cpufreq: stats: return -EEXIST when stats are already allocated

__cpufreq_stats_create_table() is called from:

- cpufreq notifier on creation of a new policy. Stats will always be
  NULL here.
- cpufreq_stats_init() for all CPUs as cpufreq-stats might have been
  initialized after cpufreq driver. For any policy, 'stats' will be
  NULL for the first CPU only and will be valid for all other CPUs
  managed by the same policy.

While we return for other CPUs, we don't return the right error value.
It's not that we would fail with -EBUSY. But generally, this is what
these return values mean:
- EBUSY: we are busy right now, try again. And the retry attempt might
  be immediate.
- EEXIST: We already have what you are trying to create and there is no
  need to create it again, and so no more tries are required.

Reviewed-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
index 80801f880dd8628779dfad0805c191c5b27727ba..d2299ca2fc2c296ce06708ce2b313f55db395bf5 100644 (file)
--- a/drivers/cpufreq/cpufreq_stats.c
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -192,8 +192,10 @@ static int __cpufreq_stats_create_table(struct cpufreq_policy *policy)
        if (unlikely(!table))
                return 0;
 
+       /* stats already initialized */
        if (per_cpu(cpufreq_stats_table, cpu))
-               return -EBUSY;
+               return -EEXIST;
+
        stat = kzalloc(sizeof(*stat), GFP_KERNEL);
        if ((stat) == NULL)
                return -ENOMEM;