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drm/ttm: alter cpu_writers to return -EBUSY in ttm_execbuf_util reservations

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This is similar to other platforms that don't allow command submission
to buffers locked on the cpu.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Maarten Lankhorst
2012-11-06 14:39:43 +01:00
committed by Dave Airlie
parent 6c1e963cc5
commit 654aa79259
4 changed files with 5 additions and 32 deletions
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5
include/drm/ttm/ttm_bo_api.h
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@@ -424,8 +424,9 @@ extern void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev,
* @no_wait: Return immediately if buffer is busy.
*
* Synchronizes a buffer object for CPU RW access. This means
* blocking command submission that affects the buffer and
* waiting for buffer idle. This lock is recursive.
* command submission that affects the buffer will return -EBUSY
* until ttm_bo_synccpu_write_release is called.
*
* Returns
* -EBUSY if the buffer is busy and no_wait is true.
* -ERESTARTSYS if interrupted by a signal.