dma-buf: Provide wrappers for reservation's lock
Joonas complained that writing ww_mutex_lock(&resv->lock, ctx) was too intrusive compared to reservation_object_lock(resv, ctx); 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> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20161115154642.31850-1-chris@chris-wilson.co.uk
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@ -144,6 +144,40 @@ reservation_object_get_list(struct reservation_object *obj)
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reservation_object_held(obj));
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}
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/**
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* reservation_object_lock - lock the reservation object
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* @obj: the reservation object
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* @ctx: the locking context
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*
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* Locks the reservation object for exclusive access and modification. Note,
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* that the lock is only against other writers, readers will run concurrently
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* with a writer under RCU. The seqlock is used to notify readers if they
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* overlap with a writer.
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*
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* As the reservation object may be locked by multiple parties in an
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* undefined order, a #ww_acquire_ctx is passed to unwind if a cycle
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* is detected. See ww_mutex_lock() and ww_acquire_init(). A reservation
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* object may be locked by itself by passing NULL as @ctx.
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*/
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static inline int
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reservation_object_lock(struct reservation_object *obj,
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struct ww_acquire_ctx *ctx)
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{
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return ww_mutex_lock(&obj->lock, ctx);
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}
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/**
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* reservation_object_unlock - unlock the reservation object
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* @obj: the reservation object
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*
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* Unlocks the reservation object following exclusive access.
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*/
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static inline void
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reservation_object_unlock(struct reservation_object *obj)
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{
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ww_mutex_unlock(&obj->lock);
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}
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/**
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* reservation_object_get_excl - get the reservation object's
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* exclusive fence, with update-side lock held
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