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davinci-cpdma: fix locking issue in cpdma_chan_stop

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

Signed-off-by: Ilya Yanok <yanok@emcraft.com>
Tested-by: Ameya Palande <2ameya@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ilya Yanok 2011-12-18 10:02:04 +00:00 committed by David S. Miller
parent 2692ba61a8
commit 7746ab0abb
1 changed files with 2 additions and 0 deletions
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2
drivers/net/ethernet/ti/davinci_cpdma.c
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@ -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) {