linux-kernel - Re: [PATCH 4/5] usb:Push BKL on open down into the drivers

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Message-Id: <201003300846.59307.oliver@neukum.org>
Date:	Tue, 30 Mar 2010 08:46:59 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Greg KH <greg@...ah.com>, USB list <linux-usb@...r.kernel.org>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] usb:Push BKL on open down into the drivers

Am Montag, 29. März 2010 15:46:59 schrieb Jiri Kosina:
> > it seems to me you cannot deadlock with the BKL and an rwsem,
> > as BKL will be dropped if a task blocks on the rwsem. 
> 
> Ah, right you are.
> 
> > This is not a nice feature of the BKL to use. Do you have an alternative 
> > idea?
> 
> Not right now, without introducing additional lock into USB core or 
> redesigning the hiddev node registration completely. Hmmm ...

Then you might want to add a comment so the next developer who wants to
eradicate BKL is warned.

	Regards
		Oliver
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