linux-kernel - [PATCH -next v2] drm/mcde: dsi: Fix return value check in mcde_dsi

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Message-ID: <20200430073145.52321-1-weiyongjun1@huawei.com>
Date:   Thu, 30 Apr 2020 07:31:45 +0000
From:   Wei Yongjun <weiyongjun1@...wei.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
CC:     Wei Yongjun <weiyongjun1@...wei.com>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>
Subject: [PATCH -next v2] drm/mcde: dsi: Fix return value check in mcde_dsi_bind()

The of_drm_find_bridge() function returns NULL on error, it doesn't return
error pointers so this check doesn't work.

Fixes: 5fc537bfd000 ("drm/mcde: Add new driver for ST-Ericsson MCDE")
Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
---
v1 - > v2: add fixes and fix the subject
---
 drivers/gpu/drm/mcde/mcde_dsi.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/mcde/mcde_dsi.c b/drivers/gpu/drm/mcde/mcde_dsi.c
index 7af5ebb0c436..e705afc08c4e 100644
--- a/drivers/gpu/drm/mcde/mcde_dsi.c
+++ b/drivers/gpu/drm/mcde/mcde_dsi.c
@@ -1073,10 +1073,9 @@ static int mcde_dsi_bind(struct device *dev, struct device *master,
 			panel = NULL;
 
 			bridge = of_drm_find_bridge(child);
-			if (IS_ERR(bridge)) {
-				dev_err(dev, "failed to find bridge (%ld)\n",
-					PTR_ERR(bridge));
-				return PTR_ERR(bridge);
+			if (!bridge) {
+				dev_err(dev, "failed to find bridge\n");
+				return -EINVAL;
 			}
 		}
 	}