linux-kernel - Re: [linux-usb-devel] 2.6.20-rc4: usb somehow broken

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Message-ID: <20070115175601.GA21679@kroah.com>
Date:	Mon, 15 Jan 2007 09:56:01 -0800
From:	Greg KH <greg@...ah.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Oliver Neukum <oliver@...kum.org>,
	linux-usb-devel@...ts.sourceforge.net, icxcnika@....tar.cc,
	linux-kernel@...r.kernel.org
Subject: Re: [linux-usb-devel] 2.6.20-rc4: usb somehow broken

On Mon, Jan 15, 2007 at 11:03:35AM -0500, Alan Stern wrote:
> On Mon, 15 Jan 2007, Oliver Neukum wrote:
> 
> > Am Sonntag, 14. Januar 2007 20:47 schrieb icxcnika@....tar.cc:
> > > > Can anyone suggest another approach?
> > > >
> > > > Alan Stern
> > > 
> > > Just a thought, you could use both a blacklist approach, and a module 
> > > paramater, or something in sysfs, to allow specifying devices that won't 
> > > be suspend and resume compatible.
> > 
> > Upon further thought, a module parameter won't do as the problem
> > will arise without a driver loaded. A sysfs parameter turns the whole
> > affair into a race condition. Will you set the guard parameter before the
> > autosuspend logic strikes?
> > Unfortunately this leaves only the least attractive solution.
> 
> There could be a mixed approach: a builtin blacklist that is extensible 
> via a procfs- or sysfs-based interface.

Yes, I think this is the best solution, allow users to add their devices
to the kernel through a sysfs interface as a temporary solution, while
providing a built-in list for known broken devices.

And yeah, I hate blacklists too, but they are necessary at times :(

thanks,

greg k-h
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