This fixes up
commit e8e89622ed361c46bf90ba4828e685a8b603f7e5
Author: Daniel Vetter <daniel.vetter@xxxxxxxx>
Date: Tue Dec 18 22:25:11 2012 +0100
drm/ttm: fix fence locking in ttm_buffer_object_transfer
which leaves behind a might_sleep in atomic context, since the
fence_lock spinlock is held over a kmalloc(GFP_KERNEL) call. The fix
is to revert the above commit and only take the lock where we need it,
around the call to ->sync_obj_ref.
Reported-by: Dave Airlie <airlied@xxxxxxxxx>
Cc: Jerome Glisse <jglisse@xxxxxxxxxx>
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
drivers/gpu/drm/ttm/ttm_bo_util.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
index d73d6e3..d4bb792 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -441,7 +441,9 @@ static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
fbo->vm_node = NULL;
atomic_set(&fbo->cpu_writers, 0);
+ spin_unlock(&bdev->fence_lock);
fbo->sync_obj = driver->sync_obj_ref(bo->sync_obj);
+ spin_lock(&bdev->fence_lock);
kref_init(&fbo->list_kref);
kref_init(&fbo->kref);
fbo->destroy = &ttm_transfered_destroy;
@@ -654,13 +656,11 @@ int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
*/
set_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
-
- /* ttm_buffer_object_transfer accesses bo->sync_obj */
- ret = ttm_buffer_object_transfer(bo, &ghost_obj);
spin_unlock(&bdev->fence_lock);
if (tmp_obj)
driver->sync_obj_unref(&tmp_obj);
+ ret = ttm_buffer_object_transfer(bo, &ghost_obj);
if (ret)
return ret;
--
1.7.10.4
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