linux-kernel - [PATCH] dmaengine: fix cyclic dma usage

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Date:	Fri, 11 May 2012 11:54:09 +0530
From:	Vinod Koul <vinod.koul@...ux.intel.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	rmk <rmk@....linux.org.uk>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Mika Westerberg <mika.westerberg@....fi>
Subject: [PATCH] dmaengine: fix cyclic dma usage


>>From 24db9e25a31ac46327253f11908463c48518dec8 Mon Sep 17 00:00:00 2001
From: Vinod Koul <vinod.koul@...ux.intel.com>
Date: Fri, 11 May 2012 11:48:21 +0530
Subject: [PATCH] dmaengine: fix cyclic dma usage

for cyclic dma, dont mark the descriptor as complete.
Fix the remaining users of cyclic dma which do so

Signed-off-by: Vinod Koul <vinod.koul@...ux.intel.com>
---
Looking for tested by for these two
---
 drivers/dma/at_hdmac.c   |    4 +++-
 drivers/dma/ep93xx_dma.c |    4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 445fdf8..bf0d7e4 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -245,7 +245,9 @@ atc_chain_complete(struct at_dma_chan *atchan, struct at_desc *desc)
 	dev_vdbg(chan2dev(&atchan->chan_common),
 		"descriptor %u complete\n", txd->cookie);
 
-	dma_cookie_complete(txd);
+	/* mark the descriptor as complete for non cyclic cases only */
+	if (!atc_chan_is_cyclic(atchan))
+		dma_cookie_complete(txd);
 
 	/* move children to free_list */
 	list_splice_init(&desc->tx_list, &atchan->free_list);
diff --git a/drivers/dma/ep93xx_dma.c b/drivers/dma/ep93xx_dma.c
index e6f133b..f6e9b57 100644
--- a/drivers/dma/ep93xx_dma.c
+++ b/drivers/dma/ep93xx_dma.c
@@ -703,7 +703,9 @@ static void ep93xx_dma_tasklet(unsigned long data)
 	desc = ep93xx_dma_get_active(edmac);
 	if (desc) {
 		if (desc->complete) {
-			dma_cookie_complete(&desc->txd);
+			/* mark descriptor complete for non cyclic case only */
+			if (!test_bit(EP93XX_DMA_IS_CYCLIC, &edmac->flags))
+				dma_cookie_complete(&desc->txd);
 			list_splice_init(&edmac->active, &list);
 		}
 		callback = desc->txd.callback;
-- 
1.7.0.4


-- 
~Vinod

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