linux-kernel - Re: [PATCH] driver core: fix shutdown races with probe/remove

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Date:	Tue, 5 Jun 2012 16:44:15 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
cc:	Ming Lei <ming.lei@...onical.com>,
	USB list <linux-usb@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH] driver core: fix shutdown races with probe/remove

On Wed, 6 Jun 2012, Greg Kroah-Hartman wrote:

> > On the whole, it might be easier just to hold the device lock during 
> > the shutdown call.
> 
> That sounds much simpler to me.

Maybe use device_trylock() in a loop, and if the lock can't be acquired 
within a second or so, either call the shutdown method without the lock 
or else skip the device entirely.

That way, crashed or buggy drivers will have less chance of interfering 
with system shutdown.

Alan Stern

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