diff --git a/drivers/opp/core.c b/drivers/opp/core.c index c2689386a906..1556998425d5 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -1492,7 +1492,11 @@ static struct dev_pm_opp *_opp_get_next(struct opp_table *opp_table, mutex_lock(&opp_table->lock); list_for_each_entry(temp, &opp_table->opp_list, node) { - if (dynamic == temp->dynamic) { + /* + * Refcount must be dropped only once for each OPP by OPP core, + * do that with help of "removed" flag. + */ + if (!temp->removed && dynamic == temp->dynamic) { opp = temp; break; } @@ -1502,10 +1506,27 @@ static struct dev_pm_opp *_opp_get_next(struct opp_table *opp_table, return opp; } -bool _opp_remove_all_static(struct opp_table *opp_table) +/* + * Can't call dev_pm_opp_put() from under the lock as debugfs removal needs to + * happen lock less to avoid circular dependency issues. This routine must be + * called without the opp_table->lock held. + */ +static void _opp_remove_all(struct opp_table *opp_table, bool dynamic) { struct dev_pm_opp *opp; + while ((opp = _opp_get_next(opp_table, dynamic))) { + opp->removed = true; + dev_pm_opp_put(opp); + + /* Drop the references taken by dev_pm_opp_add() */ + if (dynamic) + dev_pm_opp_put_opp_table(opp_table); + } +} + +bool _opp_remove_all_static(struct opp_table *opp_table) +{ mutex_lock(&opp_table->lock); if (!opp_table->parsed_static_opps) { @@ -1520,13 +1541,7 @@ bool _opp_remove_all_static(struct opp_table *opp_table) mutex_unlock(&opp_table->lock); - /* - * Can't remove the OPP from under the lock, debugfs removal needs to - * happen lock less to avoid circular dependency issues. - */ - while ((opp = _opp_get_next(opp_table, false))) - dev_pm_opp_put(opp); - + _opp_remove_all(opp_table, false); return true; } @@ -1539,25 +1554,12 @@ bool _opp_remove_all_static(struct opp_table *opp_table) void dev_pm_opp_remove_all_dynamic(struct device *dev) { struct opp_table *opp_table; - struct dev_pm_opp *opp; - int count = 0; opp_table = _find_opp_table(dev); if (IS_ERR(opp_table)) return; - /* - * Can't remove the OPP from under the lock, debugfs removal needs to - * happen lock less to avoid circular dependency issues. - */ - while ((opp = _opp_get_next(opp_table, true))) { - dev_pm_opp_put(opp); - count++; - } - - /* Drop the references taken by dev_pm_opp_add() */ - while (count--) - dev_pm_opp_put_opp_table(opp_table); + _opp_remove_all(opp_table, true); /* Drop the reference taken by _find_opp_table() */ dev_pm_opp_put_opp_table(opp_table); diff --git a/drivers/opp/opp.h b/drivers/opp/opp.h index 50fb9dced3c5..407c3bfe51d9 100644 --- a/drivers/opp/opp.h +++ b/drivers/opp/opp.h @@ -56,6 +56,7 @@ extern struct list_head opp_tables, lazy_opp_tables; * @dynamic: not-created from static DT entries. * @turbo: true if turbo (boost) OPP * @suspend: true if suspend OPP + * @removed: flag indicating that OPP's reference is dropped by OPP core. * @pstate: Device's power domain's performance state. * @rate: Frequency in hertz * @level: Performance level @@ -78,6 +79,7 @@ struct dev_pm_opp { bool dynamic; bool turbo; bool suspend; + bool removed; unsigned int pstate; unsigned long rate; unsigned int level;