[PATCH -next] spi: Fix missing unlock on error in sp7021_spi_master_transfer_one()

[Yang Yingliang]

Add the missing unlock before return from sp7021_spi_master_transfer_one()
in the error handling case.

Fixes: f62ca4e2a863 ("spi: Add spi driver for Sunplus SP7021")
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
---
 drivers/spi/spi-sunplus-sp7021.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/spi/spi-sunplus-sp7021.c b/drivers/spi/spi-sunplus-sp7021.c
index 627b9c3024e9..cbbb1664017e 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;
 		}
 
-- 
2.25.1