[PATCH 13/14] DMAENGINE: ste_dma40: don't pause/resume non-executing channels

[Linus Walleij]

From: Jonas Aaberg <jonas.aberg@xxxxxxxxxxxxxx>

There is no point in pausing what isn't running.

Signed-off-by: Jonas Aaberg <jonas.aberg@xxxxxxxxxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxxxxxx>
---
 drivers/dma/ste_dma40.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index c9f485e..05d0a99 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -768,6 +768,9 @@ static int d40_pause(struct dma_chan *chan)
 	int res = 0;
 	unsigned long flags;
 
+	if (!d40c->busy)
+		return 0;
+
 	spin_lock_irqsave(&d40c->lock, flags);
 
 	res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
@@ -792,6 +795,9 @@ static int d40_resume(struct dma_chan *chan)
 	int res = 0;
 	unsigned long flags;
 
+	if (!d40c->busy)
+		return 0;
+
 	spin_lock_irqsave(&d40c->lock, flags);
 
 	if (d40c->base->rev == 0)
-- 
1.6.3.3

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