[PATCH 4/5] drm/legacy: Convert cursor ioctl locking to interruptible.

[Maarten Lankhorst]

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 at linux.intel.com>
---
 drivers/gpu/drm/drm_plane.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 4997229d397b..63ced2e69386 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -715,7 +715,7 @@ 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)
@@ -757,8 +757,9 @@ static int drm_mode_cursor_common(struct drm_device *dev,
 	}
 out:
 	if (ret == -EDEADLK) {
-		drm_modeset_backoff(&ctx);
-		goto retry;
+		ret = drm_modeset_backoff(&ctx);
+		if (!ret)
+			goto retry;
 	}
 
 	drm_modeset_drop_locks(&ctx);
-- 
2.11.0