PM / OPP: Take reference of the OPP table while adding/removing OPPs

Take reference of the OPP table while adding and removing OPPs, that
helps us remove special checks in _remove_opp_table().

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c
index 1af349a..1a38b5d 100644 (file)
--- a/drivers/base/power/opp/core.c
+++ b/drivers/base/power/opp/core.c
@@ -971,9 +971,6 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_put_opp_table);
  */
 static void _remove_opp_table(struct opp_table *opp_table)
 {
-       if (!list_empty(&opp_table->opp_list))
-               return;
-
        dev_pm_opp_put_opp_table_unlocked(opp_table);
 }
 
@@ -1018,8 +1015,7 @@ static void _opp_remove(struct opp_table *opp_table, struct dev_pm_opp *opp)
        call_srcu(&opp_table->srcu_head.srcu, &opp->rcu_head, _kfree_opp_rcu);
 
        mutex_unlock(&opp_table->lock);
-
-       _remove_opp_table(opp_table);
+       dev_pm_opp_put_opp_table(opp_table);
 }
 
 /**
@@ -1170,6 +1166,9 @@ int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
 
        new_opp->opp_table = opp_table;
 
+       /* Get a reference to the OPP table */
+       _get_opp_table_kref(opp_table);
+
        ret = opp_debug_create_one(new_opp, opp_table);
        if (ret)
                dev_err(dev, "%s: Failed to register opp to debugfs (%d)\n",