linux-kernel - Re: [PATCH] misc: use a proper range for minor number dynamic allocation

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Message-ID: <20091110110942.4cb70b13@lxorguk.ukuu.org.uk>
Date:	Tue, 10 Nov 2009 11:09:42 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, device@...ana.org,
	rubini@...ion.unipv.it, gregkh@...e.de, cluster-devel@...hat.com
Subject: Re: [PATCH] misc: use a proper range for minor number dynamic
 allocation

> We could consider buggy the caller which asks for the same device name
> more than once, without unregistering the first device. But better safe

If they ask for the same name we certainly should. Probably we should
error that request and use WARN_ON() to shame the offender in
kerneloops.org.

> than sorry: we should protect the correct drivers from the buggy ones
> and avoid a depletion of the minor numbers. And, in case the driver core
> returns another error for another reason (from device_create), we do the
> right thing.

Agreed we need to protect the working drivers.

Alan
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