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-rw-r--r--drivers/tty/metag_da.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/tty/metag_da.c b/drivers/tty/metag_da.c
index 7332e2ca4615..3774600741d8 100644
--- a/drivers/tty/metag_da.c
+++ b/drivers/tty/metag_da.c
@@ -17,6 +17,7 @@
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
+#include <linux/moduleparam.h>
#include <linux/mutex.h>
#include <linux/sched.h>
#include <linux/serial.h>
@@ -70,6 +71,15 @@ static struct tty_driver *channel_driver;
static struct timer_list put_timer;
static struct task_struct *dashtty_thread;
+/*
+ * The console_poll parameter determines whether the console channel should be
+ * polled for input.
+ * By default the console channel isn't polled at all, in order to avoid the
+ * overhead, but that means it isn't possible to have a login on /dev/console.
+ */
+static bool console_poll;
+module_param(console_poll, bool, S_IRUGO);
+
#define RX_BUF_SIZE 1024
enum {
@@ -353,7 +363,7 @@ static int dashtty_port_activate(struct tty_port *port, struct tty_struct *tty)
* possible to have a login on /dev/console.
*
*/
- if (dport != &dashtty_ports[CONSOLE_CHANNEL])
+ if (console_poll || dport != &dashtty_ports[CONSOLE_CHANNEL])
if (atomic_inc_return(&num_channels_need_poll) == 1)
add_poll_timer(&poll_timer);
@@ -372,7 +382,7 @@ static void dashtty_port_shutdown(struct tty_port *port)
unsigned int count;
/* stop reading */
- if (dport != &dashtty_ports[CONSOLE_CHANNEL])
+ if (console_poll || dport != &dashtty_ports[CONSOLE_CHANNEL])
if (atomic_dec_and_test(&num_channels_need_poll))
del_timer_sync(&poll_timer);