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[v3,1/2] dmaengine: omap-dma: Add memory barrier to dma_resume path

Message ID 1410896757-3848-2-git-send-email-peter.ujfalusi@ti.com (mailing list archive)
State Accepted
Headers show

Commit Message

Peter Ujfalusi Sept. 16, 2014, 7:45 p.m. UTC 
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@ti.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 drivers/dma/omap-dma.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

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;
 	}