Freezer: Fix s2disk resume from initrd

Add appropriate freezer annotations to handle_initrd(), so that it's possible
to resume from disk from an initrd.

http://bugzilla.kernel.org/show_bug.cgi?id=9345

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Nigel Cunningham <nigel@nigel.suspend2.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Chris Friedhoff <chris@friedhoff.org>
Signed-off-by: Len Brown <len.brown@intel.com>

init/do_mounts_initrd.c

@@ -55,12 +55,18 @@ static void __init handle_initrd(void)
 	sys_mount(".", "/", NULL, MS_MOVE, NULL);
 	sys_chroot(".");
 
+	/*
+	 * In case that a resume from disk is carried out by linuxrc or one of
+	 * its children, we need to tell the freezer not to wait for us.
+	 */
+	current->flags |= PF_FREEZER_SKIP;
+
 	pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);
 	if (pid > 0)
-		while (pid != sys_wait4(-1, NULL, 0, NULL)) {
-			try_to_freeze();
+		while (pid != sys_wait4(-1, NULL, 0, NULL))
 			yield();
-		}
+
+	current->flags &= ~PF_FREEZER_SKIP;
 
 	/* move initrd to rootfs' /old */
 	sys_fchdir(old_fd);