From: Sean Paul <seanp...@chromium.org>
drm_atomic_get_crtc_state() returns an error pointer when it fails, so
the null check is doing nothing here.
Credit to 0-day/Dan Carpenter for reporting this.
Fixes: 6f3b62781bbd ("drm: Convert connector_helper_funcs->atomic_check to
accept drm_atomic_state")
Cc: Daniel Vetter <dan...@ffwll.ch>
Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
Cc: Jani Nikula <jani.nik...@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahti...@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
Cc: Ben Skeggs <bske...@redhat.com>
Cc: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
Cc: Kieran Bingham <kieran.bingham+rene...@ideasonboard.com>
Cc: Eric Anholt <e...@anholt.net>
Cc: Laurent Pinchart <laurent.pinch...@ideasonboard.com> [for rcar lvds]
Cc: Sean Paul <seanp...@chromium.org>
Cc: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
Cc: Maxime Ripard <maxime.rip...@bootlin.com>
Cc: Sean Paul <s...@poorly.run>
Cc: David Airlie <airl...@linux.ie>
Cc: Lyude Paul <ly...@redhat.com>
Cc: Karol Herbst <karolher...@gmail.com>
Cc: Ilia Mirkin <imir...@alum.mit.edu>
Cc: dri-de...@lists.freedesktop.org
Cc: intel-gfx@lists.freedesktop.org
Cc: linux-renesas-...@vger.kernel.org
Reported-by: kbuild test robot <l...@intel.com>
Reported-by: Dan Carpenter <dan.carpen...@oracle.com>
Signed-off-by: Sean Paul <seanp...@chromium.org>
---
drivers/gpu/drm/rcar-du/rcar_lvds.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c
b/drivers/gpu/drm/rcar-du/rcar_lvds.c
index f2a5d4d997073..1c62578590f46 100644
--- a/drivers/gpu/drm/rcar-du/rcar_lvds.c
+++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c
@@ -115,8 +115,8 @@ static int rcar_lvds_connector_atomic_check(struct
drm_connector *connector,
/* We're not allowed to modify the resolution. */
crtc_state = drm_atomic_get_crtc_state(state, conn_state->crtc);
- if (!crtc_state)
- return -EINVAL;
+ if (IS_ERR(crtc_state))
+ return PTR_ERR(crtc_state);
if (crtc_state->mode.hdisplay != panel_mode->hdisplay ||
crtc_state->mode.vdisplay != panel_mode->vdisplay)
--
Sean Paul, Software Engineer, Google / Chromium OS
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