[PATCH] 2.4.3 and SysRq over serial console

Tom Rini (trini@kernel.crashing.org)
Sat, 31 Mar 2001 16:38:08 -0700


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Hello all. Without the attached patch, SysRq doesn't work over a serial
console here. Has anyone else seen this problem?

-- 
Tom Rini (TR1265)
http://gate.crashing.org/~trini/

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diff -Nru a/linux/drivers/char/n_tty.c b/linux/drivers/char/n_tty.c --- a/linux/drivers/char/n_tty.c Sat Mar 31 16:30:44 2001 +++ b/linux/drivers/char/n_tty.c Sat Mar 31 16:30:44 2001 @@ -40,6 +40,10 @@ #include <linux/string.h> #include <linux/slab.h> #include <linux/poll.h> +#ifdef CONFIG_MAGIC_SYSRQ /* Handle the SysRq Hack */ +#include <linux/sysrq.h> +#include <linux/console.h> +#endif #include <asm/uaccess.h> #include <asm/system.h> @@ -458,6 +462,12 @@ static inline void n_tty_receive_break(struct tty_struct *tty) { +#ifdef CONFIG_MAGIC_SYSRQ /* Handle the SysRq Hack */ + struct console *c = console_drivers; + if (c && c->device && (c->device(c) == tty->device) + && !test_and_change_bit(TTY_DOING_SYSRQ, &tty->flags)) + return; +#endif if (I_IGNBRK(tty)) return; if (I_BRKINT(tty)) { @@ -506,6 +516,12 @@ { unsigned long flags; +#ifdef CONFIG_MAGIC_SYSRQ /* Handle the SysRq Hack */ + if (test_and_clear_bit(TTY_DOING_SYSRQ, &tty->flags)) { + handle_sysrq(c, NULL, NULL, tty); + return; + } +#endif if (tty->raw) { put_tty_queue(c, tty); return; diff -Nru a/linux/include/linux/tty.h b/linux/include/linux/tty.h --- a/linux/include/linux/tty.h Sat Mar 31 16:30:44 2001 +++ b/linux/include/linux/tty.h Sat Mar 31 16:30:44 2001 @@ -329,6 +329,9 @@ #define TTY_PUSH 6 #define TTY_CLOSING 7 #define TTY_DONT_FLIP 8 +#ifdef CONFIG_MAGIC_SYSRQ /* Handle the SysRq Hack */ +#define TTY_DOING_SYSRQ 9 +#endif #define TTY_HW_COOK_OUT 14 #define TTY_HW_COOK_IN 15 #define TTY_PTY_LOCK 16

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