Re: [PATCH] USB: add USB test and measurement class driver - round 2

On Wed, 27 Aug 2008, Oliver Neukum wrote:

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.

IMO all char-device registration/deregistration routines should use a
similar rwsem. Then device drivers wouldn't need to worry about it.

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.

I don't feel competent to start writing such a file. Greg, what do you
think? Maybe all that's needed to get going is to "borrow" some of the
material in LDD3. :-)

Alan Stern

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