linux-kernel - [PATCH] drm/panthor: Fix NULL vs IS_ERR() bug in panthor

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Date: Tue,  2 Apr 2024 03:40:40 -0700
From: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
To: Boris Brezillon <boris.brezillon@...labora.com>,
        Steven Price <steven.price@....com>, Liviu Dudau <liviu.dudau@....com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Grant Likely <grant.likely@...aro.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc: dan.carpenter@...aro.org, kernel-janitors@...r.kernel.org,
        error27@...il.com, harshit.m.mogalapalli@...cle.com
Subject: [PATCH] drm/panthor: Fix NULL vs IS_ERR() bug in panthor_probe()

The devm_drm_dev_alloc() function returns error pointers.
Update the error handling to check for error pointers instead of NULL.

Fixes: 4bdca1150792 ("drm/panthor: Add the driver frontend block")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
---
This is spotted by smatch and the patch is only compile tested
---
 drivers/gpu/drm/panthor/panthor_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/panthor/panthor_drv.c
index 11b3ccd58f85..1b588b37db98 100644
--- a/drivers/gpu/drm/panthor/panthor_drv.c
+++ b/drivers/gpu/drm/panthor/panthor_drv.c
@@ -1385,7 +1385,7 @@ static int panthor_probe(struct platform_device *pdev)
 
 	ptdev = devm_drm_dev_alloc(&pdev->dev, &panthor_drm_driver,
 				   struct panthor_device, base);
-	if (!ptdev)
+	if (IS_ERR(ptdev))
 		return -ENOMEM;
 
 	platform_set_drvdata(pdev, ptdev);
-- 
2.39.3