linux-kernel - [PATCH 5/8] PM: fix new mutex-locking bug in the PM core

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Date:	Tue,  4 Mar 2008 15:18:49 -0800
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 5/8] PM: fix new mutex-locking bug in the PM core

From: Alan Stern <stern@...land.harvard.edu>

This patch (as1041) fixes a bug introduced by the
acquire-all-device-semaphores reversion.  The error pathway of
dpm_suspend() fails to reacquire a mutex it should be holding.

Signed-off-by: Alan Stern <stern@...land.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 drivers/base/power/main.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index b0c16f6..d887d5c 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -428,6 +428,7 @@ static int dpm_suspend(pm_message_t state)
 
 		mutex_unlock(&dpm_list_mtx);
 		error = suspend_device(dev, state);
+		mutex_lock(&dpm_list_mtx);
 		if (error) {
 			printk(KERN_ERR "Could not suspend device %s: "
 					"error %d%s\n",
@@ -438,7 +439,6 @@ static int dpm_suspend(pm_message_t state)
 					""));
 			break;
 		}
-		mutex_lock(&dpm_list_mtx);
 		if (!list_empty(&dev->power.entry))
 			list_move(&dev->power.entry, &dpm_off);
 	}
-- 
1.5.4.3

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