TTY: pdc_cons, fix open vs timer race

The timer is initialized too late. tty->open may fire an invalid
timer. So initialize the timer earlier using DEFINE_TIMER.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 5 deletions

diff --git a/arch/parisc/kernel/pdc_cons.c b/arch/parisc/kernel/pdc_cons.c
index c1db65fc4525..8ad05215d4b1 100644
--- a/arch/parisc/kernel/pdc_cons.c
+++ b/arch/parisc/kernel/pdc_cons.c
@@ -90,7 +90,8 @@ static int pdc_console_setup(struct console *co, char *options)
 
 #define PDC_CONS_POLL_DELAY (30 * HZ / 1000)
 
-static struct timer_list pdc_console_timer;
+static void pdc_console_poll(unsigned long unused);
+static DEFINE_TIMER(pdc_console_timer, pdc_console_poll, 0, 0);
 
 static int pdc_console_tty_open(struct tty_struct *tty, struct file *filp)
 {
@@ -205,10 +206,6 @@ static int __init pdc_console_tty_driver_init(void)
 
         pdc_console_tty_driver = drv;
 
-        /* No need to initialize the pdc_console_timer if tty isn't allocated */
-        init_timer(&pdc_console_timer);
-        pdc_console_timer.function = pdc_console_poll;
-
         return 0;
 }