linux-kernel - [PATCH v3 12/12] dma: edma: Return if nothing left todo in edma

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Date:	Mon, 5 Aug 2013 11:14:57 -0500
From:	Joel Fernandes <joelf@...com>
To:	Tony Lindgren <tony@...mide.com>, Sekhar Nori <nsekhar@...com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Sricharan R <r.sricharan@...com>,
	Rajendra Nayak <rnayak@...com>,
	Lokesh Vutla <lokeshvutla@...com>,
	Matt Porter <matt@...orter.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Vinod Koul <vinod.koul@...el.com>, Dan Williams <djbw@...com>,
	Mark Brown <broonie@...aro.org>,
	Benoit Cousson <benoit.cousson@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	Balaji TK <balajitk@...com>,
	Gururaja Hebbar <gururaja.hebbar@...com>,
	Chris Ball <cjb@...top.org>,
	Jason Kridner <jkridner@...gleboard.org>
CC:	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Joel Fernandes <joelf@...com>
Subject: [PATCH v3 12/12] dma: edma: Return if nothing left todo in edma_execute

It is possible edma_execute is called even when all the SG
elements have been submitted for transmission, we add a check
for the same and avoid executing the rest of the function.

Signed-off-by: Joel Fernandes <joelf@...com>
---
 drivers/dma/edma.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index eca1b47..62987fc 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -168,6 +168,9 @@ static void edma_execute(struct edma_chan *echan)
 	total_left = edesc->pset_nr - edesc->total_processed;
 	total_link_set = total_left > MAX_NR_LS ? MAX_NR_LS : total_left;
 
+	if (!total_left)
+		return;
+
 	/* First time, setup 2 cyclically linked sets, each containing half
 	   the slots allocated for this channel */
 	if (edesc->total_processed == 0) {
-- 
1.7.9.5

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