3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Wei Yongjun <redacted>

commit 720dfd250e48a8c7fd1b2b8645955413989c4ee0 upstream.

Add the missing unlock on the error handling path in function
imxdma_xfer_desc().

Signed-off-by: Wei Yongjun <redacted>
Signed-off-by: Vinod Koul <redacted>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/dma/imx-dma.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/dma/imx-dma.c
+++ b/drivers/dma/imx-dma.c

@@ -473,8 +473,10 @@ static int imxdma_xfer_desc(struct imxdm
 			slot = i;
 			break;
 		}
-		if (slot < 0)
+		if (slot < 0) {
+			spin_unlock_irqrestore(&imxdma->lock, flags);
 			return -EBUSY;
+		}
 
 		imxdma->slots_2d[slot].xsr = d->x;
 		imxdma->slots_2d[slot].ysr = d->y;