[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>
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@ -151,6 +151,7 @@ unsigned char kbd_sysrq_xlate[KEY_MAX + 1] =
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"230\177\000\000\213\214\000\000\000\000\000\000\000\000\000\000" /* 0x50 - 0x5f */
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"\r\000/"; /* 0x60 - 0x6f */
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static int sysrq_down;
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static int sysrq_alt_use;
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#endif
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static int sysrq_alt;
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@ -1143,7 +1144,7 @@ static void kbd_keycode(unsigned int keycode, int down,
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kbd = kbd_table + fg_console;
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if (keycode == KEY_LEFTALT || keycode == KEY_RIGHTALT)
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sysrq_alt = down;
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sysrq_alt = down ? keycode : 0;
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#ifdef CONFIG_SPARC
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if (keycode == KEY_STOP)
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sparc_l1_a_state = down;
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@ -1163,9 +1164,14 @@ static void kbd_keycode(unsigned int keycode, int down,
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#ifdef CONFIG_MAGIC_SYSRQ /* Handle the SysRq Hack */
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if (keycode == KEY_SYSRQ && (sysrq_down || (down == 1 && sysrq_alt))) {
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sysrq_down = down;
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if (!sysrq_down) {
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sysrq_down = down;
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sysrq_alt_use = sysrq_alt;
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}
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return;
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}
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if (sysrq_down && !down && keycode == sysrq_alt_use)
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sysrq_down = 0;
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if (sysrq_down && down && !rep) {
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handle_sysrq(kbd_sysrq_xlate[keycode], regs, tty);
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return;
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