[Xen-devel] allow ^O through console when doubled

[Ben Pfaff <blp@xxxxxxxxxxxxxxx>]

The Xen console intercepts ^O and prevents it from propagating
through to the guest.  However, ^O is a useful key in bash and in
Emacs.  This patch changes the console to pass a single ^O
through to the guest when it is pressed twice.

Signed-off-by: Ben Pfaff <blp@xxxxxxxxxxxxxxx>

diff -r 6e03c621b579 -r b377228321f6 
linux-2.6-xen-sparse/drivers/xen/console/console.c
--- a/linux-2.6-xen-sparse/drivers/xen/console/console.c        Tue Mar 06 
15:40:06 2007 -0800
+++ b/linux-2.6-xen-sparse/drivers/xen/console/console.c        Thu Mar 08 
14:26:26 2007 -0800
@@ -348,8 +348,11 @@ void xencons_rx(char *buf, unsigned len,
 #ifdef CONFIG_MAGIC_SYSRQ
                if (sysrq_enabled) {
                        if (buf[i] == '\x0f') { /* ^O */
-                               sysrq_requested = jiffies;
-                               continue; /* don't print the sysrq key */
+                               if (!sysrq_requested) {
+                                       sysrq_requested = jiffies;
+                                       continue; /* don't print the sysrq key 
*/
+                               }
+                               sysrq_requested = 0;
                        } else if (sysrq_requested) {
                                unsigned long sysrq_timeout =
                                        sysrq_requested + HZ*2;

-- 
Ben Pfaff 
blp@xxxxxxxxxxxxxxx
http://benpfaff.org


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