diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2017-02-21 09:30:00 +0000 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2017-02-26 22:43:44 +0100 |
| commit | 2955b73def6712b693fc7ad82b34b3831faaa146 (patch) | |
| tree | 95983cbd22bb21266c19ee0e4abafc4641d34190 /include/linux/reservation.h | |
| parent | 5f15257689bfaacfc1ecd7d91a2e0515a5d3d104 (diff) | |
dma-buf/reservation: Wrap ww_mutex_trylock
In a similar fashion to reservation_object_lock() and
reservation_object_unlock(), ww_mutex_trylock is also useful and so is
worth wrapping for consistency.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
[danvet: Add __must_check Joonas wants.]
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170221093000.22802-1-chris@chris-wilson.co.uk
Diffstat (limited to 'include/linux/reservation.h')
| -rw-r--r-- | include/linux/reservation.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/reservation.h b/include/linux/reservation.h index 2b5a4679daea..156cfd330b66 100644 --- a/include/linux/reservation.h +++ b/include/linux/reservation.h @@ -167,6 +167,26 @@ reservation_object_lock(struct reservation_object *obj, } /** + * reservation_object_trylock - trylock the reservation object + * @obj: the reservation object + * + * Tries to lock the reservation object for exclusive access and modification. + * Note, that the lock is only against other writers, readers will run + * concurrently with a writer under RCU. The seqlock is used to notify readers + * if they overlap with a writer. + * + * Also note that since no context is provided, no deadlock protection is + * possible. + * + * Returns true if the lock was acquired, false otherwise. + */ +static inline bool __must_check +reservation_object_trylock(struct reservation_object *obj) +{ + return ww_mutex_trylock(&obj->lock); +} + +/** * reservation_object_unlock - unlock the reservation object * @obj: the reservation object * |