[PATCH] spi: spi-zynqmp-gqspi: unlock on error path in exec_op

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

If the allocation fails then we need to drop the &xqspi->op_lock mutex
before returning.

Fixes: a0f65be6e880 ("spi: spi-zynqmp-gqspi: add mutex locking for exec_op")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
 drivers/spi/spi-zynqmp-gqspi.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c
index 9494da9aea40..d08ca6d5670c 100644
--- a/drivers/spi/spi-zynqmp-gqspi.c
+++ b/drivers/spi/spi-zynqmp-gqspi.c
@@ -965,8 +965,10 @@ static int zynqmp_qspi_exec_op(struct spi_mem *mem,
 
 	if (op->cmd.opcode) {
 		tmpbuf = kzalloc(op->cmd.nbytes, GFP_KERNEL | GFP_DMA);
-		if (!tmpbuf)
-			return -ENOMEM;
+		if (!tmpbuf) {
+			err = -ENOMEM;
+			goto return_err;
+		}
 		tmpbuf[0] = op->cmd.opcode;
 		reinit_completion(&xqspi->data_completion);
 		xqspi->txbuf = tmpbuf;
-- 
2.30.2