From: Peter Ujfalusi <peter.ujfalusi@ti.com>
Date: Tue, 16 Sep 2014 19:45:56 +0000 (+0300)
Subject: dmaengine: omap-dma: Add memory barrier to dma_resume path
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b3d09da7e1771decc6833d1fa662bf994948c8e6;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

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@ti.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
---

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;
 	}