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--- a/net/nfc/nci/uart.c
+++ b/net/nfc/nci/uart.c
@@ -439,9 +439,17 @@ void nci_uart_set_config(struct nci_uart
if (!nu->tty)
return;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,12,0)
down_read(&nu->tty->termios_rwsem);
+#else
+ mutex_lock(&nu->tty->termios_mutex);
+#endif /* if LINUX_VERSION_CODE >= KERNEL_VERSION(3,12,0) */
new_termios = nu->tty->termios;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,12,0)
up_read(&nu->tty->termios_rwsem);
+#else
+ mutex_unlock(&nu->tty->termios_mutex);
+#endif /* if LINUX_VERSION_CODE >= KERNEL_VERSION(3,12,0) */
tty_termios_encode_baud_rate(&new_termios, baudrate, baudrate);
if (flow_ctrl)
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