linux-kernel - [PATCH 2/9] PM/resume: wait for device probing to finish

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Message-Id: <200902140200.21022.rjw@sisk.pl>
Date:	Sat, 14 Feb 2009 02:00:19 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Len Brown <lenb@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Arve Hjønnevåg <arve@...roid.com>,
	Greg KH <gregkh@...e.de>, Ingo Molnar <mingo@...e.hu>,
	Johannes Weiner <hannes@...xchg.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pavel Machek <pavel@....cz>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Alan Jenkins <alan-jenkins@...fmail.co.uk>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Andrey Borzenkov <arvidjaar@...l.ru>
Subject: [PATCH 2/9] PM/resume: wait for device probing to finish

From: Arjan van de Ven <arjan@...ux.intel.com>

the resume code does not currently wait for device probing to finish.
Even without async function calls this is dicey and not correct,
but with async function calls during the boot sequence this is going
to get hit more...

This patch adds the synchronization using the newly introduced helper.

Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>
Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
 kernel/power/disk.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

Index: linux-2.6/kernel/power/disk.c
===================================================================
--- linux-2.6.orig/kernel/power/disk.c
+++ linux-2.6/kernel/power/disk.c
@@ -595,6 +595,12 @@ static int software_resume(void)
 	unsigned int flags;
 
 	/*
+	 * If the user said "noresume".. bail out early.
+	 */
+	if (noresume)
+		return 0;
+
+	/*
 	 * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
 	 * is configured into the kernel. Since the regular hibernate
 	 * trigger path is via sysfs which takes a buffer mutex before
@@ -610,6 +616,11 @@ static int software_resume(void)
 			mutex_unlock(&pm_mutex);
 			return -ENOENT;
 		}
+		/*
+		 * Some device discovery might still be in progress; we need
+		 * to wait for this to finish.
+		 */
+		wait_for_device_probe();
 		swsusp_resume_device = name_to_dev_t(resume_file);
 		pr_debug("PM: Resume from partition %s\n", resume_file);
 	} else {
--
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