linux-kernel - [PATCH -next] mtd: nand: omap2: fix return value check in omap_nand

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Message-Id: <1468498005-10664-1-git-send-email-weiyj_lk@163.com>
Date:	Thu, 14 Jul 2016 12:06:45 +0000
From:	weiyj_lk@....com
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Richard Weinberger <richard@....at>,
	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	"Cooper Jr., Franklin" <fcooper@...com>
Cc:	Wei Yongjun <yongjun_wei@...ndmicro.com.cn>,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH -next] mtd: nand: omap2: fix return value check in omap_nand_probe()

From: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>

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

Fixes: aa7abd312c11 ('mtd: nand: omap2: Support parsing dma channel
information from DT')
Signed-off-by: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
---
 drivers/mtd/nand/omap2.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index a36ad3d..26fbe29 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1922,9 +1922,9 @@ static int omap_nand_probe(struct platform_device *pdev)
 		dma_cap_set(DMA_SLAVE, mask);
 		info->dma = dma_request_chan(pdev->dev.parent, "rxtx");
 
-		if (!info->dma) {
+		if (IS_ERR(info->dma)) {
 			dev_err(&pdev->dev, "DMA engine request failed\n");
-			err = -ENXIO;
+			err = PTR_ERR(info->dma);
 			goto return_error;
 		} else {
 			struct dma_slave_config cfg;