linux-kernel - [PATCH] drm/stm: ltdc: fix warning in ltdc_crtc_update

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Message-ID: <20180410135312.3553-1-philippe.cornu@st.com>
Date:   Tue, 10 Apr 2018 15:53:12 +0200
From:   Philippe Cornu <philippe.cornu@...com>
To:     Yannick Fertre <yannick.fertre@...com>,
        Philippe Cornu <philippe.cornu@...com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Vincent Abriou <vincent.abriou@...com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        David Airlie <airlied@...ux.ie>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
CC:     Alexandre Torgue <alexandre.torgue@...com>
Subject: [PATCH] drm/stm: ltdc: fix warning in ltdc_crtc_update_clut()

Fix the warning
"warn: variable dereferenced before check 'crtc' (see line 390)"
by removing unnecessary checks as ltdc_crtc_update_clut() is
only called from ltdc_crtc_atomic_flush() where crtc and
crtc->state are not NULL.

Many thanks to Dan Carpenter for the bug report
https://lists.freedesktop.org/archives/dri-devel/2018-February/166918.html

Signed-off-by: Philippe Cornu <philippe.cornu@...com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/gpu/drm/stm/ltdc.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index 061d2b6e5157..e3121d9e4230 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -392,9 +392,6 @@ static void ltdc_crtc_update_clut(struct drm_crtc *crtc)
 	u32 val;
 	int i;
 
-	if (!crtc || !crtc->state)
-		return;
-
 	if (!crtc->state->color_mgmt_changed || !crtc->state->gamma_lut)
 		return;
 
-- 
2.15.1