linux-kernel - [PATCH v3 1/2] dmaengine: omap-dma: Add memory barrier to dma

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Message-ID: <1410896757-3848-2-git-send-email-peter.ujfalusi@ti.com>
Date:	Tue, 16 Sep 2014 22:45:56 +0300
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	<vinod.koul@...el.com>, <dan.j.williams@...el.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	<dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>
Subject: [PATCH v3 1/2] dmaengine: omap-dma: Add memory barrier to dma_resume path

Add mb() call to resume path to ensure the necessary barrier.
Resume can happen after waking up from suspend for example.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
Acked-by: Russell King <rmk+kernel@....linux.org.uk>
---
 drivers/dma/omap-dma.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index 4cf7d9a950d7..c01ea505ee7c 100644
--- a/drivers/dma/omap-dma.c
+++ b/drivers/dma/omap-dma.c
@@ -1017,6 +1017,8 @@ static int omap_dma_resume(struct omap_chan *c)
 		return -EINVAL;
 
 	if (c->paused) {
+		mb();
+
 		omap_dma_start(c, c->desc);
 		c->paused = false;
 	}
-- 
2.1.0

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