drm: Move drm_mode_setcrtc() local re-init to failure path

Instead of always re-initializing the variables we need to clean up on
out, move the re-initialization into the branch that goes back to retry
label.

This is a lateral move right now, but will allow us to pull out the
modeset locking into common code. I kept this change separate to make
things easier to review.

Changes in v2:
- None

Reviewed-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20181129150423.239081-2-sean@poorly.run

1 files changed, 9 insertions, 7 deletions

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 268a182ae189..af4b94ce8e94 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -570,9 +570,9 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
         struct drm_mode_crtc *crtc_req = data;
         struct drm_crtc *crtc;
         struct drm_plane *plane;
-        struct drm_connector **connector_set, *connector;
-        struct drm_framebuffer *fb;
-        struct drm_display_mode *mode;
+        struct drm_connector **connector_set = NULL, *connector;
+        struct drm_framebuffer *fb = NULL;
+        struct drm_display_mode *mode = NULL;
         struct drm_mode_set set;
         uint32_t __user *set_connectors_ptr;
         struct drm_modeset_acquire_ctx ctx;
@@ -601,10 +601,6 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
         mutex_lock(&crtc->dev->mode_config.mutex);
         drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
 retry:
-        connector_set = NULL;
-        fb = NULL;
-        mode = NULL;
-
         ret = drm_modeset_lock_all_ctx(crtc->dev, &ctx);
         if (ret)
                 goto out;
@@ -766,6 +762,12 @@ out:
         }
         kfree(connector_set);
         drm_mode_destroy(dev, mode);
+
+        /* In case we need to retry... */
+        connector_set = NULL;
+        fb = NULL;
+        mode = NULL;
+
         if (ret == -EDEADLK) {
                 ret = drm_modeset_backoff(&ctx);
                 if (!ret)