opp: Reduce the size of critical section in _opp_table_kref_release()

[ Upstream commit e0df59de670b48a923246fae1f972317b84b2764 ]

There is a lot of stuff here which can be done outside of the big
opp_table_lock, do that. This helps avoiding few circular dependency
lockdeps around debugfs and interconnects.

Reported-by: Rob Clark <robdclark@gmail.com>
Reported-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 8867bab72e1715c1156921abc532e03cf9ec9e04..088c93dc0085c5a0739a132da233f40475e1eedd 100644 (file)
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -1046,6 +1046,10 @@ static void _opp_table_kref_release(struct kref *kref)
        struct opp_table *opp_table = container_of(kref, struct opp_table, kref);
        struct opp_device *opp_dev, *temp;
 
+       /* Drop the lock as soon as we can */
+       list_del(&opp_table->node);
+       mutex_unlock(&opp_table_lock);
+
        _of_clear_opp_table(opp_table);
 
        /* Release clk */
@@ -1067,10 +1071,7 @@ static void _opp_table_kref_release(struct kref *kref)
 
        mutex_destroy(&opp_table->genpd_virt_dev_lock);
        mutex_destroy(&opp_table->lock);
-       list_del(&opp_table->node);
        kfree(opp_table);
-
-       mutex_unlock(&opp_table_lock);
 }
 
 void dev_pm_opp_put_opp_table(struct opp_table *opp_table)