serial: sprd: Fix missing spin_unlock in sprd_handle_irq()

Fix return from sprd_handle_irq() with spin_lock held.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/sprd_serial.c b/drivers/tty/serial/sprd_serial.c
index 594b63331ef40e42fa75a87cde1c139a46014398..bca975f5093b73fd5ebf3e0f4ec8c42e97dfea35 100644 (file)
--- a/drivers/tty/serial/sprd_serial.c
+++ b/drivers/tty/serial/sprd_serial.c
@@ -293,8 +293,10 @@ static irqreturn_t sprd_handle_irq(int irq, void *dev_id)
 
        ims = serial_in(port, SPRD_IMSR);
 
-       if (!ims)
+       if (!ims) {
+               spin_unlock(&port->lock);
                return IRQ_NONE;
+       }
 
        serial_out(port, SPRD_ICLR, ~0);