[PATCH 6/6] dmaengine: at_hdmac: fix race while monitoring channel status

[Nicolas Ferre <nicolas.ferre@atmel.com>]

We were reading channel status then taking a lock. This lead to a race because
this lock may delay us and then make this channel not idle anymore.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
---
 drivers/dma/at_hdmac.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 99942a5..3d7d705 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -853,11 +853,11 @@ static void atc_issue_pending(struct dma_chan *chan)
 
 	dev_vdbg(chan2dev(chan), "issue_pending\n");
 
+	spin_lock_bh(&atchan->lock);
 	if (!atc_chan_is_enabled(atchan)) {
-		spin_lock_bh(&atchan->lock);
 		atc_advance_work(atchan);
-		spin_unlock_bh(&atchan->lock);
 	}
+	spin_unlock_bh(&atchan->lock);
 }
 
 /**
-- 
1.7.3