[PATCH 16/17] drm/vmwgfx: use rcu in vmw_user_dmabuf_synccpu_grab

Maarten Lankhorst
2014-07-09T12:30:44Z

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
---
drivers/gpu/drm/vmwgfx/vmwgfx_resource.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
index 20a1a866ceeb..79e950df3018 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
@@ -567,13 +567,16 @@ static int vmw_user_dmabuf_synccpu_grab(struct vmw_user_dma_buffer *user_bo,
int ret;

if (flags & drm_vmw_synccpu_allow_cs) {
- ret = ttm_bo_reserve(bo, true, !!(flags & drm_vmw_synccpu_dontblock), false, 0);
- if (!ret) {
- ret = ttm_bo_wait(bo, false, true,
- !!(flags & drm_vmw_synccpu_dontblock));
- ttm_bo_unreserve(bo);
- }
- return ret;
+ long lret;
+ if (flags & drm_vmw_synccpu_dontblock)
+ return reservation_object_test_signaled_rcu(bo->resv, true) ? 0 : -EBUSY;
+
+ lret = reservation_object_wait_timeout_rcu(bo->resv, true, true, MAX_SCHEDULE_TIMEOUT);
+ if (!lret)
+ return -EBUSY;
+ else if (lret < 0)
+ return lret;
+ return 0;
}

ret = ttm_bo_synccpu_write_grab