linux-kernel - Re: [PATCH 1/1] Char: moxa, prevent opening unavailable ports

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Date:	Wed, 10 Jun 2009 00:34:29 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jiri Slaby <jirislaby@...il.com>, linux-kernel@...r.kernel.org,
	eibach@...ys.de
Subject: Re: [PATCH 1/1] Char: moxa, prevent opening unavailable ports

> btw, what's this code in moxa_open() doing?
> 
> 	if (port == MAX_PORTS) {
> 		return capable(CAP_SYS_ADMIN) ? 0 : -EPERM;
> 	}
> 
> why does it return 0 if CAP_SYS_ADMIN?				

0-MAX_PORTS-1  = tty devices
MAX_PORTS = magic secret control channel

Alan
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