From: Jeff Dike <jdike@addtoit.com>
Date: Mon, 10 Jul 2006 11:45:16 +0000 (-0700)
Subject: [PATCH] uml: make mconsole version requests happen in a process
X-Git-Tag: v2.6.18-rc2~149
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2d77f6fcf841261796f01cba19b4ea1ad8713936;p=linux-2.6

[PATCH] uml: make mconsole version requests happen in a process

Handling a host mconsole version request must be done in a process context
rather than interrupt context now that utsname information can be
process-specific rather than global.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/arch/um/drivers/mconsole_user.c b/arch/um/drivers/mconsole_user.c
index 4b109fe7ff..9bfd405c3b 100644
--- a/arch/um/drivers/mconsole_user.c
+++ b/arch/um/drivers/mconsole_user.c
@@ -18,7 +18,12 @@
 #include "umid.h"
 
 static struct mconsole_command commands[] = {
-	{ "version", mconsole_version, MCONSOLE_INTR },
+	/* With uts namespaces, uts information becomes process-specific, so
+	 * we need a process context.  If we try handling this in interrupt
+	 * context, we may hit an exiting process without a valid uts
+	 * namespace.
+	 */
+	{ "version", mconsole_version, MCONSOLE_PROC },
 	{ "halt", mconsole_halt, MCONSOLE_PROC },
 	{ "reboot", mconsole_reboot, MCONSOLE_PROC },
 	{ "config", mconsole_config, MCONSOLE_PROC },