[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>

1 files changed, 6 insertions, 1 deletions

diff --git a/arch/um/drivers/mconsole_user.c b/arch/um/drivers/mconsole_user.c
index 4b109fe7fff8..9bfd405c3bd8 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 },