linux-kernel - Re: USB: on suspend to ram/disk all usb devices are replugged

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Message-ID: <20070401152957.GA5068@ucw.cz>
Date:	Sun, 1 Apr 2007 15:29:57 +0000
From:	Pavel Machek <pavel@....cz>
To:	Maxim <maximlevitsky@...il.com>
Cc:	Pete Zaitcev <zaitcev@...hat.com>,
	Alan Stern <stern@...land.harvard.edu>, gregkh@...e.de,
	Kernel development list <linux-kernel@...r.kernel.org>,
	USB development list <linux-usb-devel@...ts.sourceforge.net>,
	davidz@...hat.com
Subject: Re: USB: on suspend to ram/disk all usb devices are replugged

Hi!

> > > In that case the user would see data corruption - just as if he mounts a piece
> > > of removable media in a USB card reader; yanks out the card and modifies it
> > > elsewhere, and then puts it back in.
> > 
> > > I my opinion we can't really defend ourselves against such users... We can of
> > > course add checks in the file system drivers in the resume hooks to validate the
> > > super block and mount read-only if something change. 
> > 
> > The GNOME hath spoken?

> 	I also thought about that,
> 	
> 	I think that the best solution is still to hide connect/disconnect of usb devices from userspace (now it also causes corruption)
> 	But to refuse suspend with any usb mass storage device connected with mounted systems (and add a module param override
> 	 for users who know what they are doing)
> 
> 	What do you think ?

Agreed... and notice how easy is to do that in userspace :-))).

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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