diff --git a/drivers/net/slip/slip.c b/drivers/net/slip/slip.c
index 2a3892528ec3..062c20214dac 100644
--- a/drivers/net/slip/slip.c
+++ b/drivers/net/slip/slip.c
@@ -693,6 +693,8 @@ static void slip_receive_buf(struct tty_struct *tty, const unsigned char *cp,
 	if (!sl || sl->magic != SLIP_MAGIC || !netif_running(sl->dev))
 		return;
 
+	spin_lock_bh(&sl->lock);
+
 	/* Read the characters out of the buffer */
 	while (count--) {
 		if (fp && *fp++) {
@@ -708,6 +710,8 @@ static void slip_receive_buf(struct tty_struct *tty, const unsigned char *cp,
 #endif
 			slip_unesc(sl, *cp++);
 	}
+
+	spin_unlock_bh(&sl->lock);
 }
 
 /************************************