From: Simon Tatham <anakin@pobox.com>

Make sysrq-K work on serial console by passing in the tty.

Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 include/linux/serial_core.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN include/linux/serial_core.h~magic-sysrq-sak-does-nothing-on-serial-consoles include/linux/serial_core.h
--- a/include/linux/serial_core.h~magic-sysrq-sak-does-nothing-on-serial-consoles
+++ a/include/linux/serial_core.h
@@ -414,7 +414,7 @@ uart_handle_sysrq_char(struct uart_port 
 #ifdef SUPPORT_SYSRQ
 	if (port->sysrq) {
 		if (ch && time_before(jiffies, port->sysrq)) {
-			handle_sysrq(ch, regs, NULL);
+			handle_sysrq(ch, regs, port->info->tty);
 			port->sysrq = 0;
 			return 1;
 		}
_