linux-kernel - Re: [PATCH] dma: imx-dma: fix signedness bug

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Date:	Wed, 20 Oct 2010 08:37:19 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Vasiliy Kulikov <segooon@...il.com>,
	kernel-janitors@...r.kernel.org,
	Linus Walleij <linus.walleij@...ricsson.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dma: imx-dma: fix signedness bug


mxdmac->channel was unsigned, so check (imxdmac->channel < 0) for
failed imx_dma_request_by_prio() made no sence.  Explicitly check
signed values.
Also, fix uninitialzed use of ret.

Signed-off-by: Vasiliy Kulikov <segooon@...il.com>
Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
---

Here's an updated patch fixing both issues.

 drivers/dma/imx-dma.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c
index 346be62..f629e49 100644
--- a/drivers/dma/imx-dma.c
+++ b/drivers/dma/imx-dma.c
@@ -335,8 +335,10 @@ static int __init imxdma_probe(struct platform_device *pdev)
 
 		imxdmac->imxdma_channel = imx_dma_request_by_prio("dmaengine",
 				DMA_PRIO_MEDIUM);
-		if (imxdmac->channel < 0)
+		if ((int)imxdmac->channel < 0) {
+			ret = -ENODEV;
 			goto err_init;
+		}
 
 		imx_dma_setup_handlers(imxdmac->imxdma_channel,
 		       imxdma_irq_handler, imxdma_err_handler, imxdmac);
-- 
1.7.2.3

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