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[PATCH] fix magic sysrq on strange keyboards 

Magic sysrq fails to work on many keyboards, particulary most of notebook
keyboards.  This patch fixes it.

The idea is quite simple: Discard the SysRq break code if Alt is still being
held down.  This way the broken keyboard can send the break code (or the user
with a normal keyboard can release the SysRq key) and the kernel waits until
the next key is pressed or the Alt key is released.

Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Fredrik Roubert 2006-06-26 00:24:35 -07:00 committed by Linus Torvalds
parent 0c6856f702
commit d2be8ee538
1 changed files with 8 additions and 2 deletions
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10
drivers/char/keyboard.c
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@ -151,6 +151,7 @@ unsigned char kbd_sysrq_xlate[KEY_MAX + 1] =
"230\177\000\000\213\214\000\000\000\000\000\000\000\000\000\000" /* 0x50 - 0x5f */
"\r\000/"; /* 0x60 - 0x6f */
static int sysrq_down;
static int sysrq_alt_use;
#endif
static int sysrq_alt;
@ -1143,7 +1144,7 @@ static void kbd_keycode(unsigned int keycode, int down,
kbd = kbd_table + fg_console;
if (keycode == KEY_LEFTALT || keycode == KEY_RIGHTALT)
sysrq_alt = down;
sysrq_alt = down ? keycode : 0;
#ifdef CONFIG_SPARC
if (keycode == KEY_STOP)
sparc_l1_a_state = down;
@ -1163,9 +1164,14 @@ static void kbd_keycode(unsigned int keycode, int down,
#ifdef CONFIG_MAGIC_SYSRQ /* Handle the SysRq Hack */
if (keycode == KEY_SYSRQ && (sysrq_down || (down == 1 && sysrq_alt))) {
sysrq_down = down;
if (!sysrq_down) {
sysrq_down = down;
sysrq_alt_use = sysrq_alt;
}
return;
}
if (sysrq_down && !down && keycode == sysrq_alt_use)
sysrq_down = 0;
if (sysrq_down && down && !rep) {
handle_sysrq(kbd_sysrq_xlate[keycode], regs, tty);
return;