linux-kernel - [PATCH 09/10] dma: imx-sdma: use a for loop

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Message-Id: <1434385144-4432-10-git-send-email-stillcompiling@gmail.com>
Date:	Mon, 15 Jun 2015 09:19:04 -0700
From:	Joshua Clayton <stillcompiling@...il.com>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	Joshua Clayton <stillcompiling@...il.com>,
	Dan Williams <dan.j.williams@...el.com>,
	dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Shawn Guo <shawn.guo@...aro.org>
Subject: [PATCH 09/10] dma: imx-sdma: use a for loop

Switch out the strange while loop for a for loop
Someone might have thought the this construction potects against
odd sized buffers, but num_periods will alwasy be no bigger than
the number of whole buffer descriptors

Signed-off-by: Joshua Clayton <stillcompiling@...il.com>
---
 drivers/dma/imx-sdma.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index 4d447be..dfebef9 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -1158,7 +1158,7 @@ static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic(
 	struct sdma_engine *sdma = to_sdma_engine(sdmac);
 	int num_periods = buf_len / period_len;
 	int channel = sdmac->channel;
-	int ret, i = 0, buf = 0;
+	int ret, i;
 
 	sdma_prep_common(sdmac, buf_len / period_len, direction);
 
@@ -1166,7 +1166,7 @@ static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic(
 
 	sdmac->flags |= IMX_DMA_SG_LOOP;
 
-	while (buf < buf_len) {
+	for (i = 0; i < num_periods; i++) {
 		struct sdma_buffer_descriptor *bd = &sdmac->bd[i];
 		int param;
 
@@ -1191,9 +1191,6 @@ static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic(
 		bd->mode.status = param;
 
 		dma_addr += period_len;
-		buf += period_len;
-
-		i++;
 	}
 
 	sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys;
-- 
2.1.4

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