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Merge branch 'pm-opp' 

* pm-opp:
  opp: Don't drop extra references to OPPs accidentally
This commit is contained in:
Rafael J. Wysocki 2021-03-12 18:47:22 +01:00
parent b7dea0cb3d bee7359f65
commit 7180323227
2 changed files with 27 additions and 23 deletions
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48
drivers/opp/core.c
View File

@ -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);

2
drivers/opp/opp.h
View File

@ -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;