linux-kernel - Re: refcounting drivers' data structures used in sysfs buffers

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Message-ID: <Pine.LNX.4.44L0.0703081101230.4086-100000@iolanthe.rowland.org>
Date:	Thu, 8 Mar 2007 11:02:21 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Oliver Neukum <oneukum@...e.de>
cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Maneesh Soni <maneesh@...ibm.com>, <gregkh@...e.de>,
	<linux-kernel@...r.kernel.org>
Subject: Re: refcounting drivers' data structures used in sysfs buffers

On Thu, 8 Mar 2007, Oliver Neukum wrote:

> Hi,
> 
> after a lightning bolt from high above I've been looking into refcounting
> the data structures drivers use to provide the data used to refill sysfs
> buffers. I've come to the following conclusion.
> 
> 1. struct sysfs_buffer must have a struct kref * and probably a destructor
> pointer
> 2. drivers must be able to pass these pointers through an extended
> device_create_file()
> 3. Drivers must use refcounting if they want to use attributes
> 4. read/write/poll must do refcounting
> 
> I am not sure where to store the pointers. struct sysfs_dirent() looks
> like the obvious choice. Comments?

Can you explain the reasoning that led to these conclusions?  And what 
exactly was your lightning bolt?

Alan Stern

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