From: Jonas Aaberg <jonas.aberg@stericsson.com>
Date: Mon, 9 Aug 2010 12:09:12 +0000 (+0000)
Subject: DMAENGINE: ste_dma40: don't pause/resume non-executing channels
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=3ac012af3b1b3a6b373f3a9f19c5362974856c2c;p=linux-beck.git

DMAENGINE: ste_dma40: don't pause/resume non-executing channels

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

Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index c9f485e3baeb..05d0a9937617 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)