linux-kernel - [PATCH] dmaengine: ste_dma40: fix pm runtime ref counting

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Date:	Mon, 27 May 2013 16:03:40 +0200
From:	Rabin Vincent <rabin.vincent@...ricsson.com>
To:	<vinod.koul@...el.com>, <djbw@...com>
Cc:	<linus.walleij@...aro.org>, <rabin@....in>,
	<linux-kernel@...r.kernel.org>,
	Rabin Vincent <rabin.vincent@...ricsson.com>
Subject: [PATCH] dmaengine: ste_dma40: fix pm runtime ref counting

The pm runtime reference counting of the driver is broken for the case
when there is more than one transfer queued, leading to the device being
runtime suspend while active.  Fix it.

Signed-off-by: Rabin Vincent <rabin.vincent@...ricsson.com>
---
 drivers/dma/ste_dma40.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 1734fee..71bf4ec 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -1566,10 +1566,12 @@ static void dma_tc_handle(struct d40_chan *d40c)
 			return;
 		}
 
-		if (d40_queue_start(d40c) == NULL)
+		if (d40_queue_start(d40c) == NULL) {
 			d40c->busy = false;
-		pm_runtime_mark_last_busy(d40c->base->dev);
-		pm_runtime_put_autosuspend(d40c->base->dev);
+
+			pm_runtime_mark_last_busy(d40c->base->dev);
+			pm_runtime_put_autosuspend(d40c->base->dev);
+		}
 
 		d40_desc_remove(d40d);
 		d40_desc_done(d40c, d40d);
-- 
1.8.1.5

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