linux-kernel - [PATCH 10/13] s390: fix race in device

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Date:	Tue, 20 May 2008 15:34:57 -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>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>
Subject: [PATCH 10/13] s390: 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: Martin Schwidefsky <schwidefsky@...ibm.com>
Cc: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: Cornelia Huck <cornelia.huck@...ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 drivers/s390/char/vmlogrdr.c |    9 ++++-----
 1 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/s390/char/vmlogrdr.c b/drivers/s390/char/vmlogrdr.c
index e848734..2c2428c 100644
--- a/drivers/s390/char/vmlogrdr.c
+++ b/drivers/s390/char/vmlogrdr.c
@@ -762,10 +762,10 @@ static int vmlogrdr_register_device(struct vmlogrdr_priv_t *priv)
 		device_unregister(dev);
 		return ret;
 	}
-	priv->class_device = device_create(vmlogrdr_class, dev,
-					   MKDEV(vmlogrdr_major,
-						 priv->minor_num),
-					   "%s", dev->bus_id);
+	priv->class_device = device_create_drvdata(vmlogrdr_class, dev,
+						   MKDEV(vmlogrdr_major,
+							 priv->minor_num),
+						   priv, "%s", dev->bus_id);
 	if (IS_ERR(priv->class_device)) {
 		ret = PTR_ERR(priv->class_device);
 		priv->class_device=NULL;
@@ -773,7 +773,6 @@ static int vmlogrdr_register_device(struct vmlogrdr_priv_t *priv)
 		device_unregister(dev);
 		return ret;
 	}
-	dev->driver_data = priv;
 	priv->device = dev;
 	return 0;
 }
-- 
1.5.5.1

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