linux-kernel - [PATCH] Fix failure to resume from initrds

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Message-Id: <200709141422.18788.rjw@sisk.pl>
Date:	Fri, 14 Sep 2007 14:22:18 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Nigel Cunningham <nigel@...el.suspend2.net>,
	Pavel Machek <pavel@....cz>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] Fix failure to resume from initrds

[Please consider as 2.6.23 material]
---
From: Nigel Cunningham <nigel@...el.suspend2.net>

Commit 831441862956fffa17b9801db37e6ea1650b0f69 (Freezer: make kernel threads
nonfreezable by default) breaks freezing when attempting to resume from an
initrd, because the init (which is freezeable) spins while waiting for another
thread to run /linuxrc, but doesn't check whether it has been told to enter
the refrigerator. The original patch replaced a call to try_to_freeze() with a
call to yield(). I believe a simple reversion is wrong because
if !CONFIG_PM_SLEEP, try_to_freeze() is a noop. It should still yield.

Signed-off-by: Nigel Cunningham <nigel@...el.suspend2.net>
Acked-by: Rafael J. Wysocki <rjw@...k.pl>
---
 init/do_mounts_initrd.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: linux-2.6.23-rc6/init/do_mounts_initrd.c
===================================================================
--- linux-2.6.23-rc6.orig/init/do_mounts_initrd.c
+++ linux-2.6.23-rc6/init/do_mounts_initrd.c
@@ -57,8 +57,10 @@ static void __init handle_initrd(void)
 
 	pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);
 	if (pid > 0)
-		while (pid != sys_wait4(-1, NULL, 0, NULL))
+		while (pid != sys_wait4(-1, NULL, 0, NULL)) {
+			try_to_freeze();
 			yield();
+		}
 
 	/* move initrd to rootfs' /old */
 	sys_fchdir(old_fd);
-
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