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Message-Id: <1211322900-12705-10-git-send-email-gregkh@suse.de>
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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