dma-buf/reservation: Wrap ww_mutex_trylock (2955b73d) · Commits · 戴 / test

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

include/linux/reservation.h

+20 −0

Original line number	Diff line number	Diff line
		@@ -166,6 +166,26 @@ reservation_object_lock(struct reservation_object *obj,
		return ww_mutex_lock(&obj->lock, ctx);
		}

		/**
		* 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

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