Re: [RFC] [PATCH] Adding ctrl-o sysrq hack support to 8250 driver

[Olaf Hering <olh@suse.de>]

 On Wed, Dec 07, Russell King wrote:

> Easily.  Have a look at the internals of uart_handle_break() in
> include/linux/serial_core.h

This one works for me, tested with 2.6.5.


 drivers/serial/8250.c |    7 +++++++
 1 files changed, 7 insertions(+)

Index: linux-2.6.15-rc5-olh/drivers/serial/8250.c
===================================================================
--- linux-2.6.15-rc5-olh.orig/drivers/serial/8250.c
+++ linux-2.6.15-rc5-olh/drivers/serial/8250.c
@@ -1154,6 +1154,13 @@ receive_chars(struct uart_8250_port *up,
 			 */
 		}
 		ch = serial_inp(up, UART_RX);
+
+#if defined(CONFIG_MAGIC_SYSRQ) && defined(CONFIG_SERIAL_CORE_CONSOLE)
+		/* Handle the SysRq ^O Hack, but only on the system console */
+		if (ch == '\x0f' && uart_handle_break(&up->port))
+			goto ignore_char;
+#endif
+
 		flag = TTY_NORMAL;
 		up->port.icount.rx++;
 

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 alias appserv=wotan