linux-kernel - Re: [Bluez-devel] Oops involving RFCOMM and sysfs

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Message-ID: <20080118112337.0b457c49@gondolin.boeblingen.de.ibm.com>
Date:	Fri, 18 Jan 2008 11:23:37 +0100
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	"Dave Young" <hidave.darkstar@...il.com>
Cc:	"Gabor Gombas" <gombasg@...aki.hu>, "Tejun Heo" <htejun@...il.com>,
	"Al Viro" <viro@...iv.linux.org.uk>, linux-kernel@...r.kernel.org,
	bluez-devel@...ts.sf.net, kay.sievers@...y.org,
	"Greg KH" <greg@...ah.com>,
	"Marcel Holtmann" <marcel@...tmann.org>, davem@...emloft.net
Subject: Re: [Bluez-devel] Oops involving RFCOMM and sysfs

On Fri, 18 Jan 2008 10:19:33 +0100,
Cornelia Huck <cornelia.huck@...ibm.com> wrote:

> > 
> > 1314         if (IS_ERR(new_parent_kobj)) {
> > 1315                 error = PTR_ERR(new_parent_kobj);
> > 1316                 put_device(new_parent);
> > 1317                 goto out;
> > 1318         }
> > 1319         pr_debug("DEVICE: moving '%s' to '%s'\n", dev->bus_id,
> > 1320                  new_parent ? new_parent->bus_id : "<NULL>");
> > 1321         error = kobject_move(&dev->kobj, new_parent_kobj);
> > 1322         if (error) {
> > 1323                 put_device(new_parent);
> > 
> > imagine new_parent is NULL, then the new_parent_kobj should be put
> 
> No, we would need a put_device_parent() (crappy name) which puts the
> reference iff get_device_parent() grabbed it.

And looking at Greg's patchset, it has cleanup_device_parent(), which
does just that. But it is only called in device_del(), not when
device_move() has errors.

(get_device_parent() also always returns a pointer to a kobject or
NULL, so we can get rid of those IS_ERR() checks in setup_parent() and
device_move() as well.)
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