The patch below does not apply to the 3.12-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 72368d122c7479aa6e14fbbd334717b8a0c157a6 Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@xxxxxxxxx>
Date: Fri, 27 Dec 2013 01:07:11 +0100
Subject: [PATCH] cpufreq: Clean up after a failing light-weight initialization
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
If cpufreq_policy_restore() returns NULL during system resume,
__cpufreq_add_dev() should just fall back to the full initialization
instead of returning an error, because that may actually make things
work. Moreover, it should not leave stale fallback data behind after
it has failed to restore a previously existing policy.
This change is based on Viresh Kumar's work.
Fixes: 5302c3fb2e62 ("cpufreq: Perform light-weight init/teardown during suspend/resume")
Reported-by: Bjørn Mork <bjorn@xxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Acked-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Cc: 3.12+ <stable@xxxxxxxxxxxxxxx> # 3.12+
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 16d7b4ac94be..f13a663d1da5 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1016,15 +1016,17 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif,
read_unlock_irqrestore(&cpufreq_driver_lock, flags);
#endif
- if (frozen)
- /* Restore the saved policy when doing light-weight init */
- policy = cpufreq_policy_restore(cpu);
- else
+ /*
+ * Restore the saved policy when doing light-weight init and fall back
+ * to the full init if that fails.
+ */
+ policy = frozen ? cpufreq_policy_restore(cpu) : NULL;
+ if (!policy) {
+ frozen = false;
policy = cpufreq_policy_alloc();
-
- if (!policy)
- goto nomem_out;
-
+ if (!policy)
+ goto nomem_out;
+ }
/*
* In the resume path, since we restore a saved policy, the assignment
@@ -1118,8 +1120,11 @@ err_get_freq:
if (cpufreq_driver->exit)
cpufreq_driver->exit(policy);
err_set_policy_cpu:
- if (frozen)
+ if (frozen) {
+ /* Do not leave stale fallback data behind. */
+ per_cpu(cpufreq_cpu_data_fallback, cpu) = NULL;
cpufreq_policy_put_kobj(policy);
+ }
cpufreq_policy_free(policy);
nomem_out:
--
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