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| author |   Liang He <windhl@126.com> | 2022-07-18 21:36:32 +0800 |
|---|---|---|
| committer |   Viresh Kumar <viresh.kumar@linaro.org> | 2022-07-19 11:07:02 +0530 |
| commit | 3466ea2cd6b66e4647a9af2381c0d0cd3d579354 (patch) | |
| tree | 1e673682efbb6b56767bc25de157eea3553f18b4 | |
| parent | OPP: Don't drop opp_table->np reference while it is still in use (diff) | |
| download | wireguard-linux-3466ea2cd6b66e4647a9af2381c0d0cd3d579354.tar.xz wireguard-linux-3466ea2cd6b66e4647a9af2381c0d0cd3d579354.zip | |
OPP: Don't drop opp->np reference while it is still in use
The struct dev_pm_opp contains a reference of the DT node, opp->np,
throughout its lifetime. We should increase the refcount for the same
from _opp_add_static_v2(), and drop it while removing the OPP finally.
Signed-off-by: Liang He <windhl@126.com>
[ Viresh: Updated subject / commit log, create _of_clear_opp() and drop
reference from it]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
| -rw-r--r-- | drivers/opp/core.c | 2 | ||||
| -rw-r--r-- | drivers/opp/of.c | 12 | ||||
| -rw-r--r-- | drivers/opp/opp.h | 6 |
3 files changed, 12 insertions, 8 deletions
diff --git a/drivers/opp/core.c b/drivers/opp/core.c index 4f4a285886fa..77d1ba3a4154 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -1553,7 +1553,7 @@ static void _opp_kref_release(struct kref *kref) * frequency/voltage list. */ blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_REMOVE, opp); - _of_opp_free_required_opps(opp_table, opp); + _of_clear_opp(opp_table, opp); opp_debug_remove_one(opp); kfree(opp); } diff --git a/drivers/opp/of.c b/drivers/opp/of.c index e4002b075422..7fa8263e38cb 100644 --- a/drivers/opp/of.c +++ b/drivers/opp/of.c @@ -254,8 +254,8 @@ void _of_clear_opp_table(struct opp_table *opp_table) * Release all resources previously acquired with a call to * _of_opp_alloc_required_opps(). */ -void _of_opp_free_required_opps(struct opp_table *opp_table, - struct dev_pm_opp *opp) +static void _of_opp_free_required_opps(struct opp_table *opp_table, + struct dev_pm_opp *opp) { struct dev_pm_opp **required_opps = opp->required_opps; int i; @@ -275,6 +275,12 @@ void _of_opp_free_required_opps(struct opp_table *opp_table, kfree(required_opps); } +void _of_clear_opp(struct opp_table *opp_table, struct dev_pm_opp *opp) +{ + _of_opp_free_required_opps(opp_table, opp); + of_node_put(opp->np); +} + /* Populate all required OPPs which are part of "required-opps" list */ static int _of_opp_alloc_required_opps(struct opp_table *opp_table, struct dev_pm_opp *opp) @@ -938,7 +944,7 @@ static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table, new_opp->turbo = of_property_read_bool(np, "turbo-mode"); - new_opp->np = np; + new_opp->np = of_node_get(np); new_opp->dynamic = false; new_opp->available = true; diff --git a/drivers/opp/opp.h b/drivers/opp/opp.h index 816009eaafee..3a6e077df386 100644 --- a/drivers/opp/opp.h +++ b/drivers/opp/opp.h @@ -267,14 +267,12 @@ static inline bool lazy_linking_pending(struct opp_table *opp_table) void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index); void _of_clear_opp_table(struct opp_table *opp_table); struct opp_table *_managed_opp(struct device *dev, int index); -void _of_opp_free_required_opps(struct opp_table *opp_table, - struct dev_pm_opp *opp); +void _of_clear_opp(struct opp_table *opp_table, struct dev_pm_opp *opp); #else static inline void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index) {} static inline void _of_clear_opp_table(struct opp_table *opp_table) {} static inline struct opp_table *_managed_opp(struct device *dev, int index) { return NULL; } -static inline void _of_opp_free_required_opps(struct opp_table *opp_table, - struct dev_pm_opp *opp) {} +static inline void _of_clear_opp(struct opp_table *opp_table, struct dev_pm_opp *opp) {} #endif #ifdef CONFIG_DEBUG_FS |