linux-kernel - [PATCH] drm/pl111: Fix missing unwind goto in pl111_amba

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Date:   Wed, 29 Mar 2023 10:18:24 -0700
From:   Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
To:     emma@...olt.net, eric@...olt.net, tom.cooksey@....com
Cc:     error27@...il.com, daniel@...ll.ch, airlied@...il.com,
        linus.walleij@...aro.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
Subject: [PATCH] drm/pl111: Fix missing unwind goto in pl111_amba_probe()

Smatch reports:
	drivers/gpu/drm/pl111/pl111_drv.c:300
	pl111_amba_probe() warn: missing unwind goto?

When devm_request_irq() returns non-zero value, we need to drop the
reference for drm device and also release reserved memory which is
done in "dev_put" label. So instead of directly returning, goto dev_put
to fix this bug.

Fixes: bed41005e617 ("drm/pl111: Initial drm/kms driver for pl111")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
---
This is based on static analysis, Only Compile tested.
---
 drivers/gpu/drm/pl111/pl111_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/pl111/pl111_drv.c b/drivers/gpu/drm/pl111/pl111_drv.c
index 4b2a9e9753f6..72c5d3681b47 100644
--- a/drivers/gpu/drm/pl111/pl111_drv.c
+++ b/drivers/gpu/drm/pl111/pl111_drv.c
@@ -297,7 +297,7 @@ static int pl111_amba_probe(struct amba_device *amba_dev,
 			       variant->name, priv);
 	if (ret != 0) {
 		dev_err(dev, "%s failed irq %d\n", __func__, ret);
-		return ret;
+		goto dev_put;
 	}
 
 	ret = pl111_modeset_init(drm);
-- 
2.38.1