linux-kernel - [PATCH v3 08/12] dma: edma: Add one more required slot to MAX slots

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Date:	Mon, 5 Aug 2013 11:14:53 -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 08/12] dma: edma: Add one more required slot to MAX slots

We'd now need a separate slot just for the channel and separate
ones for the 2 linked sets, so we make adjustments to allocate
an extra channel accordingly.

Signed-off-by: Joel Fernandes <joelf@...com>
---
 drivers/dma/edma.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index a242269..df50a04 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -48,7 +48,7 @@
 
 /* Max of 16 segments per channel to conserve PaRAM slots */
 #define MAX_NR_SG		16
-#define EDMA_MAX_SLOTS		MAX_NR_SG
+#define EDMA_MAX_SLOTS		(MAX_NR_SG+1)
 #define EDMA_DESCRIPTORS	16
 
 struct edma_desc {
@@ -311,6 +311,9 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg(
 
 	num_slots_needed = sg_len > MAX_NR_SG ? MAX_NR_SG : sg_len;
 
+	/* Allocate one extra to account for the channel itself */
+	num_slots_needed++;
+
 	for (i = 0; i < num_slots_needed; i++) {
 		if (echan->slot[i] < 0) {
 			echan->slot[i] =
-- 
1.7.9.5

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