linux-kernel - [PATCH] drivers/dma: Fix unsigned compared against 0

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Message-Id: <20241005093436.27728-1-advaitdhamorikar@gmail.com>
Date: Sat,  5 Oct 2024 15:04:36 +0530
From: Advait Dhamorikar <advaitdhamorikar@...il.com>
To: Vinod Koul <vkoul@...nel.org>
Cc: dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	skhan@...uxfoundation.org,
	anupnewsmail@...il.com,
	Advait Dhamorikar <advaitdhamorikar@...il.com>
Subject: [PATCH] drivers/dma: Fix unsigned compared against 0

An unsigned value can never be negative,
so this test will always evaluate the same way.
In ep93xx_dma_alloc_chan_resources: An unsigned dma_cfg.port's
value is checked against EP93XX_DMA_I2S1 which is 0.

Signed-off-by: Advait Dhamorikar <advaitdhamorikar@...il.com>
---
 drivers/dma/ep93xx_dma.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/dma/ep93xx_dma.c b/drivers/dma/ep93xx_dma.c
index 995427afe077..6d7f6bd12d76 100644
--- a/drivers/dma/ep93xx_dma.c
+++ b/drivers/dma/ep93xx_dma.c
@@ -929,8 +929,7 @@ static int ep93xx_dma_alloc_chan_resources(struct dma_chan *chan)
 
 	/* Sanity check the channel parameters */
 	if (!edmac->edma->m2m) {
-		if (edmac->dma_cfg.port < EP93XX_DMA_I2S1 ||
-		    edmac->dma_cfg.port > EP93XX_DMA_IRDA)
+		if (edmac->dma_cfg.port > EP93XX_DMA_IRDA)
 			return -EINVAL;
 		if (edmac->dma_cfg.dir != ep93xx_dma_chan_direction(chan))
 			return -EINVAL;
-- 
2.34.1