linux-kernel - [PATCH 1/2] pm_trace: Lock pm device list mutex.

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Message-Id: <201010092336.11548.james@albanarts.com>
Date:	Sat, 9 Oct 2010 23:36:11 +0100
From:	James Hogan <james@...anarts.com>
To:	linux-pm@...ts.linux-foundation.org
Cc:	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Randy Dunlap <rdunlap@...otime.net>,
	"Greg Kroah-Hartman" <gregkh@...e.de>,
	Alan Stern <stern@...land.harvard.edu>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	markgross <markgross@...gnar.org>
Subject: [PATCH 1/2] pm_trace: Lock pm device list mutex.

Lock the pm device list mutex using device_pm_lock() and
device_pm_unlock() around the list iteration in show_dev_hash().

show_dev_hash() was reverse iterating dpm_list without first locking the
mutex that the functions in drivers/base/power/main.c lock. I assume
this was unintentional since there is no comment suggesting why the lock
might not be necessary.

Signed-off-by: James Hogan <james@...anarts.com>
---
 drivers/base/power/trace.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/base/power/trace.c b/drivers/base/power/trace.c
index 0a1a2c4..17e24e3 100644
--- a/drivers/base/power/trace.c
+++ b/drivers/base/power/trace.c
@@ -188,8 +188,10 @@ static int show_file_hash(unsigned int value)
 static int show_dev_hash(unsigned int value)
 {
 	int match = 0;
-	struct list_head *entry = dpm_list.prev;
+	struct list_head *entry;
 
+	device_pm_lock();
+	entry = dpm_list.prev;
 	while (entry != &dpm_list) {
 		struct device * dev = to_device(entry);
 		unsigned int hash = hash_string(DEVSEED, dev_name(dev), DEVHASH);
@@ -199,6 +201,7 @@ static int show_dev_hash(unsigned int value)
 		}
 		entry = entry->prev;
 	}
+	device_pm_unlock();
 	return match;
 }
 
-- 
1.7.2.3

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