linux-kernel - [PATCH 09/13] SOUND: fix race in device

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Date:	Tue, 20 May 2008 15:34:56 -0700
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	Kay Sievers <kay.sievers@...y.org>,
	Jaroslav Kysela <perex@...ex.cz>
Subject: [PATCH 09/13] SOUND: fix race in device_create

There is a race from when a device is created with device_create() and
then the drvdata is set with a call to dev_set_drvdata() in which a
sysfs file could be open, yet the drvdata will be NULL, causing all
sorts of bad things to happen.

This patch fixes the problem by using the new function,
device_create_drvdata().

Cc: Kay Sievers <kay.sievers@...y.org>
Cc: Jaroslav Kysela <perex@...ex.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 sound/core/sound.c |    8 +++-----
 1 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/sound/core/sound.c b/sound/core/sound.c
index 812f91b..6c8ab48 100644
--- a/sound/core/sound.c
+++ b/sound/core/sound.c
@@ -259,8 +259,9 @@ int snd_register_device_for_dev(int type, struct snd_card *card, int dev,
 		return minor;
 	}
 	snd_minors[minor] = preg;
-	preg->dev = device_create(sound_class, device, MKDEV(major, minor),
-				  "%s", name);
+	preg->dev = device_create_drvdata(sound_class, device,
+					  MKDEV(major, minor),
+					  private_data, "%s", name);
 	if (IS_ERR(preg->dev)) {
 		snd_minors[minor] = NULL;
 		mutex_unlock(&sound_mutex);
@@ -269,9 +270,6 @@ int snd_register_device_for_dev(int type, struct snd_card *card, int dev,
 		return minor;
 	}
 
-	if (preg->dev)
-		dev_set_drvdata(preg->dev, private_data);
-
 	mutex_unlock(&sound_mutex);
 	return 0;
 }
-- 
1.5.5.1

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