From 5d276a1acaa80f4b7a76577510a2b1835ce01f4f Mon Sep 17 00:00:00 2001 From: Christian König Date: Thu, 9 Nov 2017 09:59:05 +0100 Subject: dma-buf: add reservation_object_lock_interruptible() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit That's the only wrapper function missing and necessary to cleanup TTM. Reviewed-and-Tested-by: Michel Dänzer Signed-off-by: Christian König Signed-off-by: Alex Deucher Link: https://patchwork.freedesktop.org/patch/msgid/20171109085909.1653-3-christian.koenig@amd.com --- include/linux/reservation.h | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) (limited to 'include/linux/reservation.h') diff --git a/include/linux/reservation.h b/include/linux/reservation.h index 21fc84d82d41..02166e815afb 100644 --- a/include/linux/reservation.h +++ b/include/linux/reservation.h @@ -166,6 +166,29 @@ reservation_object_lock(struct reservation_object *obj, return ww_mutex_lock(&obj->lock, ctx); } +/** + * reservation_object_lock_interruptible - lock the reservation object + * @obj: the reservation object + * @ctx: the locking context + * + * Locks the reservation object interruptible 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. + * + * As the reservation object may be locked by multiple parties in an + * undefined order, a #ww_acquire_ctx is passed to unwind if a cycle + * is detected. See ww_mutex_lock() and ww_acquire_init(). A reservation + * object may be locked by itself by passing NULL as @ctx. + */ +static inline int +reservation_object_lock_interruptible(struct reservation_object *obj, + struct ww_acquire_ctx *ctx) +{ + return ww_mutex_lock_interruptible(&obj->lock, ctx); +} + + /** * reservation_object_trylock - trylock the reservation object * @obj: the reservation object -- cgit