I failed to properly onion-wrap the unwind code: We acquire the vblank
reference before we start with the wait-wound locking dance, hence we
must make sure we retry before we drop the reference. Oops.
Fixes: 29dc0d1de182 ("drm: Roll out acquire context for the page_flip ioctl")
Cc: Harry Wentland <harry.wentland@xxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
Cc: Sean Paul <seanpaul@xxxxxxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Reported-by: Tommi Rantala <tt.rantala@xxxxxxxxx>
Cc: Tommi Rantala <tt.rantala@xxxxxxxxx>
Cc: Michel Dänzer <michel@xxxxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
---
drivers/gpu/drm/drm_plane.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index fedd4d60d9cd..24c8a611b98a 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -948,6 +948,11 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
}
out:
+ if (ret == -EDEADLK) {
+ drm_modeset_backoff(&ctx);
+ goto retry;
+ }
+
if (ret && crtc->funcs->page_flip_target)
drm_crtc_vblank_put(crtc);
if (fb)
@@ -956,11 +961,6 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
drm_framebuffer_put(crtc->primary->old_fb);
crtc->primary->old_fb = NULL;
- if (ret == -EDEADLK) {
- drm_modeset_backoff(&ctx);
- goto retry;
- }
-
drm_modeset_drop_locks(&ctx);
drm_modeset_acquire_fini(&ctx);
--
2.11.0
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