linux-kernel - Re: [PATCH] Driver core: fix race in dev_driver

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Message-ID: <20091204165040.GB2180@suse.de>
Date:	Fri, 4 Dec 2009 08:50:40 -0800
From:	Greg KH <gregkh@...e.de>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	Alan Stern <stern@...land.harvard.edu>, stable@...nel.org,
	Rickard Bellini <rickard.bellini@...csson.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	Torgny Johansson <torgny.johansson@...csson.com>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Driver core: fix race in dev_driver_string

On Fri, Dec 04, 2009 at 05:16:19PM +0100, Oliver Neukum wrote:
> Am Freitag, 4. Dezember 2009 17:06:57 schrieb Alan Stern:
> > Oliver:
> > 
> > We don't have to worry about the device structure being deallocated 
> > while the routine is running.  If that happens it's a bug in the 
> > caller: improper refcounting.
> 
> That raises two points
> 
> 1. am I supposed to get a reference just so that I can use dev_err?

No, you should already have a reference on the device when doing the
call, right?

> 2. what happens if this is a soft disconnect and the device is reconnected?
> It seems to me that you'd print the wrong driver's name.

Then we can live with that, it's not that big of a deal.

thanks,

greg k-h
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