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@emcraft.com>
Tested-by: Ameya Palande <2ameya@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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 dca9d3369cdd..c97d2f590855 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) {