From: Nigel Cunningham <nigel@nigel.suspend2.net>
Date: Wed, 19 Sep 2007 05:46:25 +0000 (-0700)
Subject: Fix failure to resume from initrds
X-Git-Tag: v2.6.23-rc7~28
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=019ad4a0a60b09022945273848b5a686e39a78aa;p=linux-2.6

Fix failure to resume from initrds

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@nigel.suspend2.net>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index a6b4c0c08e..fd4fc12d26 100644
--- a/init/do_mounts_initrd.c
+++ b/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);