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dma-buf: add reservation_object_lock_interruptible()

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That's the only wrapper function missing and necessary to cleanup TTM.

Reviewed-and-Tested-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171109085909.1653-3-christian.koenig@amd.com
This commit is contained in:
Christian König 2017-11-09 09:59:05 +01:00 committed by Alex Deucher
parent b5e821bb86
commit 5d276a1aca
1 changed files with 23 additions and 0 deletions
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23
include/linux/reservation.h
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@ -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