linux-kernel - Re: [PATCH] driver-core: don't free devt

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Message-ID: <46433D42.2060101@gmail.com>
Date:	Thu, 10 May 2007 17:41:54 +0200
From:	Tejun Heo <htejun@...il.com>
To:	Kay Sievers <kay.sievers@...y.org>
CC:	Greg KH <greg@...ah.com>, Chris Rankin <rankincj@...oo.com>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-usb-devel@...ts.sourceforge.net,
	linux-kernel <linux-kernel@...r.kernel.org>, stable@...nel.org
Subject: Re: [PATCH] driver-core: don't free devt_attr till the device is
 released

Kay Sievers wrote:
> On 5/10/07, Tejun Heo <htejun@...il.com> wrote:
>> Currently, devt_attr for the "dev" file is freed immediately on device
>> removal, but if the "dev" sysfs file is open when a device is removed,
>> sysfs will access its attribute structure for further access including
>> close resulting in jumping to garbled address.  Fix it by postponing
>> freeing devt_attr to device release time.
>>
>> Note that devt_attr for class_device is already freed on release.
> 
> Hi Tejun,
> your rework removes the "owner" field from the attributes. I think we
> kept the "dev" and "uevent" attribute as part of "struct device" only
> to be able to assign it the actual owner of the module that has
> created the device. The attribute can probably just live as one
> instance statically in the driver core now?

Yeah, that's -mm and this is for -stable and -22.  For -mm, we can just
make all those attributes static which is the other patch is this
thread.  :-)

-- 
tejun
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