From: Pan Bian <bianpan2016@163.com>
To: Boris Brezillon <boris.brezillon@free-electrons.com>,
Richard Weinberger <richard@nod.at>,
David Woodhouse <dwmw2@infradead.org>,
Brian Norris <computersforpeace@gmail.com>,
Marek Vasut <marek.vasut@gmail.com>,
Cyrille Pitchen <cyrille.pitchen@wedev4u.fr>
Cc: linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org,
Pan Bian <bianpan2016@163.com>
Subject: mtd: nand: use dma_mapping_error to check map errors
Date: Tue, 8 Aug 2017 22:35:42 +0800 [thread overview]
Message-ID: <1502202942-23984-1-git-send-email-bianpan2016@163.com> (raw)
The return value of dma_map_single() should be checked by
dma_mapping_error(). However, in function flctl_dma_fifo0_transfer(), its
return value is checked against NULL, which could result in failures.
Signed-off-by: Pan Bian <bianpan2016@163.com>
---
drivers/mtd/nand/sh_flctl.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mtd/nand/sh_flctl.c b/drivers/mtd/nand/sh_flctl.c
index 891ac7b..2404d66 100644
--- a/drivers/mtd/nand/sh_flctl.c
+++ b/drivers/mtd/nand/sh_flctl.c
@@ -411,7 +411,7 @@ static int flctl_dma_fifo0_transfer(struct sh_flctl *flctl, unsigned long *buf,
dma_addr = dma_map_single(chan->device->dev, buf, len, dir);
- if (dma_addr)
+ if (!dma_mapping_error(chan->device->dev, dma_addr))
desc = dmaengine_prep_slave_single(chan, dma_addr, len,
tr_dir, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
--
1.9.1
next reply other threads:[~2017-08-08 14:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-08 14:35 Pan Bian [this message]
2017-08-13 7:56 ` mtd: nand: use dma_mapping_error to check map errors Boris Brezillon
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