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authorSrivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>2013-09-12 01:42:59 +0530
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-09-11 23:29:57 +0200
commit0d66b91ebff49841f607a3c079984c907c8a4199 (patch)
treef6902da36a77353a0034bf17d0120f1ae5e4dbd3 /drivers/cpufreq
parent6cdcdb793791f776ea9408581b1242b636d43b37 (diff)
cpufreq: Fix crash in cpufreq-stats during suspend/resume
Stephen Warren reported that the cpufreq-stats code hits a NULL pointer dereference during the second attempt to suspend a system. He also pin-pointed the problem to commit 5302c3f "cpufreq: Perform light-weight init/teardown during suspend/resume". That commit actually ensured that the cpufreq-stats table and the cpufreq-stats sysfs entries are *not* torn down (ie., not freed) during suspend/resume, which makes it all the more surprising. However, it turns out that the root-cause is not that we access an already freed memory, but that the reference to the allocated memory gets moved around and we lose track of that during resume, leading to the reported crash in a subsequent suspend attempt. In the suspend path, during CPU offline, the value of policy->cpu is updated by choosing one of the surviving CPUs in that policy, as long as there is atleast one CPU in that policy. And cpufreq_stats_update_policy_cpu() is invoked to update the reference to the stats structure by assigning it to the new CPU. However, in the resume path, during CPU online, we end up assigning a fresh CPU as the policy->cpu, without letting cpufreq-stats know about this. Thus the reference to the stats structure remains (incorrectly) associated with the old CPU. So, in a subsequent suspend attempt, during CPU offline, we end up accessing an incorrect location to get the stats structure, which eventually leads to the NULL pointer dereference. Fix this by letting cpufreq-stats know about the update of the policy->cpu during CPU online in the resume path. (Also, move the update_policy_cpu() function higher up in the file, so that __cpufreq_add_dev() can invoke it). Reported-and-tested-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/cpufreq.c37
1 files changed, 24 insertions, 13 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 5a64f66d36e0..62bdb955ea56 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -947,6 +947,18 @@ static void cpufreq_policy_free(struct cpufreq_policy *policy)
kfree(policy);
}
+static void update_policy_cpu(struct cpufreq_policy *policy, unsigned int cpu)
+{
+ policy->last_cpu = policy->cpu;
+ policy->cpu = cpu;
+
+#ifdef CONFIG_CPU_FREQ_TABLE
+ cpufreq_frequency_table_update_policy_cpu(policy);
+#endif
+ blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
+ CPUFREQ_UPDATE_POLICY_CPU, policy);
+}
+
static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif,
bool frozen)
{
@@ -1000,7 +1012,18 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif,
if (!policy)
goto nomem_out;
- policy->cpu = cpu;
+
+ /*
+ * In the resume path, since we restore a saved policy, the assignment
+ * to policy->cpu is like an update of the existing policy, rather than
+ * the creation of a brand new one. So we need to perform this update
+ * by invoking update_policy_cpu().
+ */
+ if (frozen && cpu != policy->cpu)
+ update_policy_cpu(policy, cpu);
+ else
+ policy->cpu = cpu;
+
policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
cpumask_copy(policy->cpus, cpumask_of(cpu));
@@ -1092,18 +1115,6 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
return __cpufreq_add_dev(dev, sif, false);
}
-static void update_policy_cpu(struct cpufreq_policy *policy, unsigned int cpu)
-{
- policy->last_cpu = policy->cpu;
- policy->cpu = cpu;
-
-#ifdef CONFIG_CPU_FREQ_TABLE
- cpufreq_frequency_table_update_policy_cpu(policy);
-#endif
- blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
- CPUFREQ_UPDATE_POLICY_CPU, policy);
-}
-
static int cpufreq_nominate_new_policy_cpu(struct cpufreq_policy *policy,
unsigned int old_cpu, bool frozen)
{