linux-kernel - [PATCH next] mtd: nand: realtek-ecc: Fix a IS

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Message-ID: <aN-XoqpP2Jz75pjj@stanley.mountain>
Date: Fri, 3 Oct 2025 12:30:10 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Markus Stockhausen <markus.stockhausen@....de>
Cc: Miquel Raynal <miquel.raynal@...tlin.com>,
	Richard Weinberger <richard@....at>,
	Vignesh Raghavendra <vigneshr@...com>,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH next] mtd: nand: realtek-ecc: Fix a IS_ERR() vs NULL bug in
 probe

The dma_alloc_noncoherent() function doesn't return error pointers, it
returns NULL on error.  Fix the error checking to match.

Fixes: 3148d0e5b1c5 ("mtd: nand: realtek-ecc: Add Realtek external ECC engine support")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/mtd/nand/ecc-realtek.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/nand/ecc-realtek.c b/drivers/mtd/nand/ecc-realtek.c
index 7d718934c909..7c275f1eb4a7 100644
--- a/drivers/mtd/nand/ecc-realtek.c
+++ b/drivers/mtd/nand/ecc-realtek.c
@@ -418,8 +418,8 @@ static int rtl_ecc_probe(struct platform_device *pdev)
 
 	rtlc->buf = dma_alloc_noncoherent(dev, RTL_ECC_DMA_SIZE, &rtlc->buf_dma,
 					  DMA_BIDIRECTIONAL, GFP_KERNEL);
-	if (IS_ERR(rtlc->buf))
-		return PTR_ERR(rtlc->buf);
+	if (!rtlc->buf)
+		return -ENOMEM;
 
 	rtlc->dev = dev;
 	rtlc->engine.dev = dev;
-- 
2.51.0