linux-kernel - [PATCH] drm/ssd130x: Fix possible uninitialized usage of crtc

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Message-ID: <20231020225338.1686974-1-javierm@redhat.com>
Date:   Sat, 21 Oct 2023 00:52:57 +0200
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Javier Martinez Canillas <javierm@...hat.com>,
        Dan Carpenter <dan.carpenter@...aro.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...il.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH] drm/ssd130x: Fix possible uninitialized usage of crtc_state variable

Avoid a possible uninitialized use of the crtc_state variable in function
ssd132x_primary_plane_atomic_check() and avoid the following Smatch warn:

    drivers/gpu/drm/solomon/ssd130x.c:921 ssd132x_primary_plane_atomic_check()
    error: uninitialized symbol 'crtc_state'.

Fixes: fdd591e00a9c ("drm/ssd130x: Add support for the SSD132x OLED controller family")
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Closes: https://lore.kernel.org/dri-devel/7dd6ca45-8263-44fe-a318-2fd9d761425d@moroto.mountain/
Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
---

 drivers/gpu/drm/solomon/ssd130x.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/solomon/ssd130x.c b/drivers/gpu/drm/solomon/ssd130x.c
index 32f0857aec9f..e0174f82e353 100644
--- a/drivers/gpu/drm/solomon/ssd130x.c
+++ b/drivers/gpu/drm/solomon/ssd130x.c
@@ -910,7 +910,7 @@ static int ssd132x_primary_plane_atomic_check(struct drm_plane *plane,
 	struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
 	struct ssd130x_plane_state *ssd130x_state = to_ssd130x_plane_state(plane_state);
 	struct drm_crtc *crtc = plane_state->crtc;
-	struct drm_crtc_state *crtc_state;
+	struct drm_crtc_state *crtc_state = NULL;
 	const struct drm_format_info *fi;
 	unsigned int pitch;
 	int ret;
-- 
2.41.0