linux-kernel - [PATCH -next] drm/shmob: Fix return value check in shmob_drm

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Date:   Mon, 17 Dec 2018 17:18:30 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <laurent.pinchart@...asonboard.com>,
        <kieran.bingham+renesas@...asonboard.com>, <airlied@...ux.ie>,
        <daniel@...ll.ch>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-renesas-soc@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>,
        YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH -next] drm/shmob: Fix return value check in shmob_drm_probe

In case of error, the function devm_ioremap_resource() returns ERR_PTR()
and never returns NULL. The NULL test in the return value check should
be replaced with IS_ERR().

Fixes: 8f1597c8f1a5 ("drm: shmobile: Perform initialization/cleanup at probe/remove time")
Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
 drivers/gpu/drm/shmobile/shmob_drm_drv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/shmobile/shmob_drm_drv.c b/drivers/gpu/drm/shmobile/shmob_drm_drv.c
index 8554102..f2cfd16 100644
--- a/drivers/gpu/drm/shmobile/shmob_drm_drv.c
+++ b/drivers/gpu/drm/shmobile/shmob_drm_drv.c
@@ -229,8 +229,8 @@ static int shmob_drm_probe(struct platform_device *pdev)
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	sdev->mmio = devm_ioremap_resource(&pdev->dev, res);
-	if (sdev->mmio == NULL)
-		return -ENOMEM;
+	if (IS_ERR(sdev->mmio))
+		return PTR_ERR(sdev->mmio);
 
 	ret = shmob_drm_setup_clocks(sdev, pdata->clk_source);
 	if (ret < 0)
-- 
2.7.0