drm: eliminate old_fb from drm_crtc_helper_set_config

Old framebuffer is stored in save_set.fb and it is
the same value that is later stored in old_fb.
This makes old_fb redundant so we can replace
it with save_set.fb.

Signed-off-by: Ilija Hadzic <ihadzic@research.bell-labs.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index 866dcfc..11040a5 100644 (file)
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -603,7 +603,6 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
        struct drm_device *dev;
        struct drm_crtc *save_crtcs, *new_crtc, *crtc;
        struct drm_encoder *save_encoders, *new_encoder, *encoder;
-       struct drm_framebuffer *old_fb = NULL;
        bool mode_changed = false; /* if true do a full mode set */
        bool fb_changed = false; /* if true and !mode_changed just do a flip */
        struct drm_connector *save_connectors, *connector;
@@ -798,14 +797,13 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
                        DRM_DEBUG_KMS("attempting to set mode from"
                                        " userspace\n");
                        drm_mode_debug_printmodeline(set->mode);
-                       old_fb = set->crtc->fb;
                        set->crtc->fb = set->fb;
                        if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
                                                      set->x, set->y,
-                                                     old_fb)) {
+                                                     save_set.fb)) {
                                DRM_ERROR("failed to set mode on [CRTC:%d]\n",
                                          set->crtc->base.id);
-                               set->crtc->fb = old_fb;
+                               set->crtc->fb = save_set.fb;
                                ret = -EINVAL;
                                goto fail;
                        }
@@ -820,13 +818,11 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
        } else if (fb_changed) {
                set->crtc->x = set->x;
                set->crtc->y = set->y;
-
-               old_fb = set->crtc->fb;
                set->crtc->fb = set->fb;
                ret = crtc_funcs->mode_set_base(set->crtc,
-                                               set->x, set->y, old_fb);
+                                               set->x, set->y, save_set.fb);
                if (ret != 0) {
-                       set->crtc->fb = old_fb;
+                       set->crtc->fb = save_set.fb;
                        goto fail;
                }
        }