linux-kernel - [PATCH -next] staging: mt7621-eth: fix return value check in mt7621_gsw

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Message-ID: <1521684607-77277-1-git-send-email-weiyongjun1@huawei.com>
Date:   Thu, 22 Mar 2018 02:10:07 +0000
From:   Wei Yongjun <weiyongjun1@...wei.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        John Crispin <blogic@...nwrt.org>, NeilBrown <neil@...wn.name>
CC:     Wei Yongjun <weiyongjun1@...wei.com>, <devel@...verdev.osuosl.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <kernel-janitors@...r.kernel.org>
Subject: [PATCH -next] staging: mt7621-eth: fix return value check in mt7621_gsw_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: f079b6406348 ("staging: mt7621-eth: add gigabit switch driver (GSW)")
Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
---
 drivers/staging/mt7621-eth/gsw_mt7621.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/mt7621-eth/gsw_mt7621.c b/drivers/staging/mt7621-eth/gsw_mt7621.c
index b49ee94..ce8d7d7 100644
--- a/drivers/staging/mt7621-eth/gsw_mt7621.c
+++ b/drivers/staging/mt7621-eth/gsw_mt7621.c
@@ -263,8 +263,8 @@ static int mt7621_gsw_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	gsw->base = devm_ioremap_resource(&pdev->dev, res);
-	if (!gsw->base)
-		return -EADDRNOTAVAIL;
+	if (IS_ERR(gsw->base))
+		return PTR_ERR(gsw->base);
 
 	gsw->dev = &pdev->dev;
 	gsw->irq = irq_of_parse_and_map(pdev->dev.of_node, 0);