4.4-stable review patch. If anyone has any objections, please let me know.
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From: Satendra Singh Thakur satendra.t@samsung.com
[ Upstream commit fc2a69f3903dfd97cd47f593e642b47918c949df ]
In the func drm_atomic_set_crtc_for_plane, with the current code, if crtc of the plane_state and crtc passed as argument to the func are same, entire func will executed in vein. It will get state of crtc and clear and set the bits in plane_mask. All these steps are not required for same old crtc. Ideally, we should do nothing in this case, this patch handles the same, and causes the program to return without doing anything in such scenario.
Signed-off-by: Satendra Singh Thakur satendra.t@samsung.com Cc: Madhur Verma madhur.verma@samsung.com Cc: Hemanshu Srivastava hemanshu.s@samsung.com Signed-off-by: Daniel Vetter daniel.vetter@ffwll.ch Link: https://patchwork.freedesktop.org/patch/msgid/1525326572-25854-1-git-send-em... Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/drm_atomic.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -960,7 +960,9 @@ drm_atomic_set_crtc_for_plane(struct drm { struct drm_plane *plane = plane_state->plane; struct drm_crtc_state *crtc_state; - + /* Nothing to do for same crtc*/ + if (plane_state->crtc == crtc) + return 0; if (plane_state->crtc) { crtc_state = drm_atomic_get_crtc_state(plane_state->state, plane_state->crtc);