linux-kernel - mtd: nand: use dma_mapping

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Date:   Tue,  8 Aug 2017 22:35:42 +0800
From:   Pan Bian <bianpan2016@....com>
To:     Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Pan Bian <bianpan2016@....com>
Subject: mtd: nand: use dma_mapping_error to check map errors

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@....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