linux-kernel - Re: [PATCH] move eject code from zd1211rw to usb-storage

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Date:	Tue, 15 Dec 2009 15:59:15 +0100
From:	Josua Dietze <digidietze@...isberghof.de>
To:	Stefan Seyfried <stefan.seyfried@...glemail.com>
CC:	linux-usb@...r.kernel.org, linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org, usb-storage@...ts.one-eyed-alien.net,
	Stefan Seyfried <seife@...airon.com>
Subject: Re: [PATCH] move eject code from zd1211rw to usb-storage

Stefan Seyfried schrieb:
 > But given that there is already an "option_zero_cd" parameter in

> usb-storage, it should be easy to massage this into a general "do not
> eject virtual installer media" flag so that people are still able to
> get the windows driver files off their devices should they need to do
> so.
> 
>> I'd like to see these devices removed from unusual_devs.h.
> 
> I'd like them to work with one driver, not two (one in kernel and one
> in userspace).

The more basic arguments that prevailed at the last time such an 
"eject" command was being considered for inclusion into usb-storage 
were:

1. Userspace can obviously react a lot quicker than kernel space to 
new or changed devices popping up.

2. Userspace works with older kernels immediately.

> That's a fundamental difference in opinions, and I fear I'm not the one
> who is going to decice how this will be handled ;)

Neither am I. But the number of known mode-switching USB devices is 
now at around 50. New ones are arriving by the month or even week.

A decision to handle *all of them* in usb-storage would lead to the 
disadvantages pointed out.

A decision to handle just *some of them* can hardly be made 
plausible if there are no immediate technical reasons.

Oh, and in most cases (including your suggestion) there *are* 
already two drivers necessary to make these devices work, 
independent of where the switching is happening ...

> Have fun,

You too!

Josh
-- 
Man is the only creature on earth enabled to take a
warm meal while flying!                      Loriot
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