linux-kernel - Re: [PATCH] USB: add USB test and measurement class driver

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Date:	Wed, 27 Aug 2008 21:05:49 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Greg KH <greg@...ah.com>, USB list <linux-usb@...r.kernel.org>,
	Stefan Kopp <stefan_kopp@...lent.com>,
	Marcel Janssen <korgull@...e.nl>,
	Felipe Balbi <me@...ipebalbi.com>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] USB: add USB test and measurement class driver - round 2

Am Mittwoch 27 August 2008 20:58:08 schrieb Alan Stern:
> > And this rule depends on sharing the USB major or not. This needs
> > a big fat mention in Documentation.
> 
> You mean that the open/disconnect locking rule applies only to drivers 
> that call usb_register_dev, i.e, drivers using the USB major.  Right?

Yes. In fact drivers not using the USB major but their own char devices
will need such a lock. This is tricky.

> I agree that it deserves to be mentioned in the documentation 
> somewhere.  Where would be a good place?  None of the existing files in 
> Documentation/usb seem appropriate.

The USB major merits a file of its own.

	Regards
		Oliver
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