netdev - [PATCH] davinci-cpdma: fix locking issue in cpdma_chan

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Message-Id: <1324238524-21330-1-git-send-email-yanok@emcraft.com>
Date:	Sun, 18 Dec 2011 21:02:04 +0100
From:	Ilya Yanok <yanok@...raft.com>
To:	netdev@...r.kernel.org, linux-omap@...r.kernel.org
Cc:	Ilya Yanok <yanok@...raft.com>
Subject: [PATCH] davinci-cpdma: fix locking issue in cpdma_chan_stop

Free the channel lock before calling __cpdma_chan_process to prevent
dead lock.

Signed-off-by: Ilya Yanok <yanok@...raft.com>
---
 drivers/net/ethernet/ti/davinci_cpdma.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ethernet/ti/davinci_cpdma.c b/drivers/net/ethernet/ti/davinci_cpdma.c
index dca9d33..c97d2f5 100644
--- a/drivers/net/ethernet/ti/davinci_cpdma.c
+++ b/drivers/net/ethernet/ti/davinci_cpdma.c
@@ -836,11 +836,13 @@ int cpdma_chan_stop(struct cpdma_chan *chan)
 	chan_write(chan, cp, CPDMA_TEARDOWN_VALUE);
 
 	/* handle completed packets */
+	spin_unlock_irqrestore(&chan->lock, flags);
 	do {
 		ret = __cpdma_chan_process(chan);
 		if (ret < 0)
 			break;
 	} while ((ret & CPDMA_DESC_TD_COMPLETE) == 0);
+	spin_lock_irqsave(&chan->lock, flags);
 
 	/* remaining packets haven't been tx/rx'ed, clean them up */
 	while (chan->head) {
-- 
1.7.6.4

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