diff --git a/drivers/spi/spi-sunplus-sp7021.c b/drivers/spi/spi-sunplus-sp7021.c
index 627b9c3024e96aceaffcb285f1ffed2d92557404..cbbb1664017eb7be2023016e079266082a3b0997 100644
--- a/drivers/spi/spi-sunplus-sp7021.c
+++ b/drivers/spi/spi-sunplus-sp7021.c
@@ -351,6 +351,7 @@ static int sp7021_spi_master_transfer_one(struct spi_controller *ctlr, struct sp
 
 		if (!wait_for_completion_interruptible_timeout(&pspim->isr_done, timeout)) {
 			dev_err(&spi->dev, "wait_for_completion err\n");
+			mutex_unlock(&pspim->buf_lock);
 			return -ETIMEDOUT;
 		}