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Merge branch 'opp/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm

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Pull operating performance points (OPP) framework fixes for 5.9-rc4 from
Viresh Kumar:

"This fixes reference counting for OPP tables. Few patches are getting
 queued (for various subsystems) for 5.10 which depend on this to be
 fixed first."

* 'opp/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm:
  opp: Don't drop reference for an OPP table that was never parsed
This commit is contained in:
Rafael J. Wysocki 2020-09-01 19:44:20 +02:00
commit 763700f5e0
2 changed files with 17 additions and 7 deletions
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22
drivers/opp/core.c
View File

@ -1296,13 +1296,19 @@ void dev_pm_opp_remove(struct device *dev, unsigned long freq)
} }
EXPORT_SYMBOL_GPL(dev_pm_opp_remove); EXPORT_SYMBOL_GPL(dev_pm_opp_remove);
void _opp_remove_all_static(struct opp_table *opp_table) bool _opp_remove_all_static(struct opp_table *opp_table)
{ {
struct dev_pm_opp *opp, *tmp; struct dev_pm_opp *opp, *tmp;
bool ret = true;
mutex_lock(&opp_table->lock); mutex_lock(&opp_table->lock);
if (!opp_table->parsed_static_opps || --opp_table->parsed_static_opps) if (!opp_table->parsed_static_opps) {
ret = false;
goto unlock;
}
if (--opp_table->parsed_static_opps)
goto unlock; goto unlock;
list_for_each_entry_safe(opp, tmp, &opp_table->opp_list, node) { list_for_each_entry_safe(opp, tmp, &opp_table->opp_list, node) {
@ -1312,6 +1318,8 @@ void _opp_remove_all_static(struct opp_table *opp_table)
unlock: unlock:
mutex_unlock(&opp_table->lock); mutex_unlock(&opp_table->lock);
return ret;
} }
/** /**
@ -2414,12 +2422,14 @@ void _dev_pm_opp_find_and_remove_table(struct device *dev)
return; return;
} }
_opp_remove_all_static(opp_table); /*
* Drop the extra reference only if the OPP table was successfully added
/* Drop reference taken by _find_opp_table() */ * with dev_pm_opp_of_add_table() earlier.
**/
if (_opp_remove_all_static(opp_table))
dev_pm_opp_put_opp_table(opp_table); dev_pm_opp_put_opp_table(opp_table);
/* Drop reference taken while the OPP table was added */ /* Drop reference taken by _find_opp_table() */
dev_pm_opp_put_opp_table(opp_table); dev_pm_opp_put_opp_table(opp_table);
} }

2
drivers/opp/opp.h
View File

@ -212,7 +212,7 @@ struct opp_table {
/* Routines internal to opp core */ /* Routines internal to opp core */
void dev_pm_opp_get(struct dev_pm_opp *opp); void dev_pm_opp_get(struct dev_pm_opp *opp);
void _opp_remove_all_static(struct opp_table *opp_table); bool _opp_remove_all_static(struct opp_table *opp_table);
void _get_opp_table_kref(struct opp_table *opp_table); void _get_opp_table_kref(struct opp_table *opp_table);
int _get_opp_count(struct opp_table *opp_table); int _get_opp_count(struct opp_table *opp_table);
struct opp_table *_find_opp_table(struct device *dev); struct opp_table *_find_opp_table(struct device *dev);