diff options
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/metag_da.c | 14 |
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); |