[PATCH] PM: make it possible to disable console suspending

Change suspend_console() so that it waits for all consoles to flush the
remaining messages and make it possible to switch the console suspending off
with the help of a Kconfig option.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: Stefan Seyfried <seife@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 619ecabf7c58..4b6e2f18e056 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -36,6 +36,17 @@ config PM_DEBUG
         code. This is helpful when debugging and reporting various PM bugs, 
         like suspend support.
 
+config DISABLE_CONSOLE_SUSPEND
+        bool "Keep console(s) enabled during suspend/resume (DANGEROUS)"
+        depends on PM && PM_DEBUG
+        default n
+        ---help---
+        This option turns off the console suspend mechanism that prevents
+        debug messages from reaching the console during the suspend/resume
+        operations.  This may be helpful when debugging device drivers'
+        suspend/resume routines, but may itself lead to problems, for example
+        if netconsole is used.
+
 config PM_TRACE
         bool "Suspend/resume event tracing"
         depends on PM && PM_DEBUG && X86_32 && EXPERIMENTAL