dmaengine: at_xdmac: fix missing spin_unlock

Lock taken when entering the function but unlock missing before it
returns.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
index bf2aacbbf4cc..586275fe1120 100644
--- a/drivers/dma/at_xdmac.c
+++ b/drivers/dma/at_xdmac.c
@@ -901,6 +901,7 @@ at_xdmac_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
          */
         if (!desc->active_xfer) {
                 dma_set_residue(txstate, desc->xfer_size);
+                spin_unlock_bh(&atchan->lock);
                 return ret;
         }