On Sat, 2015-11-21 at 09:06 +0530, Viresh Kumar wrote:

Subsys interface's ->remove_dev() is called when the cpufreq driver is unregistering or the CPU is getting physically removed. We keep removing the cpuX/cpufreq link for all CPUs except the last one, which is a mistake as all CPUs contain a link now.

Because of this, one CPU from each policy will still contain a link (to an already removed policyX directory), after the cpufreq driver is unregistered.

Fix that by removing the link first and then only see if the policy is required to be freed. That will make sure that no links are left out.

Fixes: 96bdda61f58b ("cpufreq: create cpu/cpufreq/policyX directories") Reported-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com

Tested-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com

...

Signed-off-by: Viresh Kumar viresh.kumar@linaro.org

[v2] Drop the unnecessary 'return', sorry about that :(

drivers/cpufreq/cpufreq.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 7c48e7316d91..a83c995a62df 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1401,13 +1401,10 @@ static void cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif) } cpumask_clear_cpu(cpu, policy->real_cpus);

• remove_cpu_dev_symlink(policy, cpu);

• if (cpumask_empty(policy->real_cpus)) {

• if (cpumask_empty(policy->real_cpus)) cpufreq_policy_free(policy, true);

• return;
  

• }
• remove_cpu_dev_symlink(policy, cpu);

} static void handle_update(struct work_struct *work)