linux-kernel - [PATCH v3 10/12] dma: edma: Check if MAX_NR

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Date:	Mon, 5 Aug 2013 11:14:55 -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 10/12] dma: edma: Check if MAX_NR_SG is even in prep function

Splitting of MAX available slots into 2 sets of size MAX_NR_LS
requires to the MAX_NR_SG function to be even. We ensure the same
in prep 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 70923a2..061f0cf 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -354,6 +354,9 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg(
 	int src_bidx, dst_bidx, src_cidx, dst_cidx;
 	int i, num_slots_needed;
 
+	if (MAX_NR_SG & 1)
+		dev_err(dev, "%s: MAX_NR_SG must be even\n", __func__);
+
 	if (unlikely(!echan || !sgl || !sg_len))
 		return NULL;
 
-- 
1.7.9.5

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