drm/legacy: Convert cursor ioctl locking to interruptible.

Pass DRM_MODESET_ACQUIRE_INTERRUPTIBLE to acquire_init, and handle
drm_modeset_backoff which can now fail by returning the error.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20170912133749.6532-4-maarten.lankhorst@linux.intel.com
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>

diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 85ab1ee..15549cc 100644 (file)
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -833,7 +833,7 @@ static int drm_mode_cursor_common(struct drm_device *dev,
                return -ENOENT;
        }
 
-       drm_modeset_acquire_init(&ctx, 0);
+       drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
 retry:
        ret = drm_modeset_lock(&crtc->mutex, &ctx);
        if (ret)
@@ -875,8 +875,9 @@ retry:
        }
 out:
        if (ret == -EDEADLK) {
-               drm_modeset_backoff(&ctx);
-               goto retry;
+               ret = drm_modeset_backoff(&ctx);
+               if (!ret)
+                       goto retry;
        }
 
        drm_modeset_drop_locks(&ctx);