linux-kernel - [PATCH 5/6] dma: dw: return DMA_SUCCESS immediately from device_tx

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Date:	Mon, 15 Jul 2013 15:04:40 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Viresh Kumar <viresh.linux@...il.com>,
	Vinod Koul <vinod.koul@...el.com>,
	linux-kernel@...r.kernel.org, spear-devel@...t.st.com
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH 5/6] dma: dw: return DMA_SUCCESS immediately from device_tx_status()

There is no point to go throught the rest of the function if first call to
dma_cookie_status() returned DMA_SUCCESS.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/dma/dw/core.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index f70c6b4..22fc7b3 100644
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -1098,12 +1098,12 @@ dwc_tx_status(struct dma_chan *chan,
 	enum dma_status		ret;
 
 	ret = dma_cookie_status(chan, cookie, txstate);
-	if (ret != DMA_SUCCESS) {
-		dwc_scan_descriptors(to_dw_dma(chan->device), dwc);
+	if (ret == DMA_SUCCESS)
+		return ret;
 
-		ret = dma_cookie_status(chan, cookie, txstate);
-	}
+	dwc_scan_descriptors(to_dw_dma(chan->device), dwc);
 
+	ret = dma_cookie_status(chan, cookie, txstate);
 	if (ret != DMA_SUCCESS)
 		dma_set_residue(txstate, dwc_get_residue(dwc));
 
-- 
1.8.3.2

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