[PATCH weston 1/1] compositor-drm: Release current & next fb when deactivating the session

[Miguel A. Vico]

With

     commit 47224cc9312fef05c1a523ea0da0a1aae66f100d
     Author: Daniel Stone <daniels at collabora.com>
     Date:   Sat Nov 5 08:04:07 2016 +0000

         compositor-drm: Delete drm_backend_set_modes

we stopped forcing a modeset when restoring the session. The motivation
was that we would use a stale fb, so better to let the next repaint
handle it.

However, if drm_output::current != NULL, we won't issue a modeset upon
repaint.

This change releases both drm_output::current and drm_output::next when
deactivating the current session. This ensures the very first repaint
after restoring the session will issue a modeset.

Signed-off-by: Miguel A Vico Moya <mvicomoya at nvidia.com>
---
 libweston/compositor-drm.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/libweston/compositor-drm.c b/libweston/compositor-drm.c
index 3f7e97e6..6643d5c4 100644
--- a/libweston/compositor-drm.c
+++ b/libweston/compositor-drm.c
@@ -2998,6 +2998,14 @@ session_notify(struct wl_listener *listener, void *data)
 		wl_list_for_each(output, &compositor->output_list, base.link) {
 			output->base.repaint_needed = false;
 			drmModeSetCursor(b->drm.fd, output->crtc_id, 0, 0, 0);
+			if (output->current != NULL) {
+				drm_output_release_fb(output, output->current);
+				output->current = NULL;
+			}
+			if (output->next != NULL) {
+				drm_output_release_fb(output, output->next);
+				output->next = NULL;
+			}
 		}
 
 		output = container_of(compositor->output_list.next,
-- 
2.12.1