1 files changed, 4 insertions, 4 deletions

diff --git a/include/linux/tty.h b/include/linux/tty.h
index 90b4fdc8a61f..1c3316a47d7e 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -208,7 +208,7 @@ struct tty_port {
         wait_queue_head_t       delta_msr_wait; /* Modem status change */
         unsigned long           flags;          /* TTY flags ASY_*/
         unsigned char           console:1,      /* port is a console */
-                                low_latency:1;  /* direct buffer flush */
+                                low_latency:1;  /* optional: tune for latency */
         struct mutex            mutex;          /* Locking */
         struct mutex            buf_mutex;      /* Buffer alloc lock */
         unsigned char           *xmit_buf;      /* Optional buffer */
@@ -518,9 +518,9 @@ extern void tty_port_put(struct tty_port *port);
 
 static inline struct tty_port *tty_port_get(struct tty_port *port)
 {
-        if (port)
-                kref_get(&port->kref);
-        return port;
+        if (port && kref_get_unless_zero(&port->kref))
+                return port;
+        return NULL;
 }
 
 /* If the cts flow control is enabled, return true. */