[PATCH 3/6] drm/msm: Map command buffers to kernel only if required

[Jordan Crouse]

From: Sushmita Susheelendra <ssusheel at codeaurora.org>

Map command buffers to the kernel address space only if
relocs are specified for the submission. This reduces some
overhead on the submission path.

Signed-off-by: Sushmita Susheelendra <ssusheel at codeaurora.org>
Signed-off-by: Jordan Crouse <jcrouse at codeaurora.org>
---
 drivers/gpu/drm/msm/msm_gem_submit.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
index 2708d3a..2d2aa65 100644
--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -320,6 +320,9 @@ static int submit_reloc(struct msm_gem_submit *submit, struct msm_gem_object *ob
 		return -EINVAL;
 	}
 
+	if (nr_relocs == 0)
+		return 0;
+
 	/* For now, just map the entire thing.  Eventually we probably
 	 * to do it page-by-page, w/ kmap() if not vmap()d..
 	 */
-- 
1.9.1