linux-kernel - Re: [PATCH 5/5] opticon: Fix resume logic

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Message-ID: <20091006232331.5684bbee@lxorguk.ukuu.org.uk>
Date:	Tue, 6 Oct 2009 23:23:31 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	Alan Cox <alan@...ux.intel.com>,
	Alan Stern <stern@...land.harvard.edu>, greg@...ah.com,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 5/5] opticon: Fix resume logic

On Tue, 6 Oct 2009 23:12:17 +0200
Oliver Neukum <oliver@...kum.org> wrote:

> Am Dienstag, 6. Oktober 2009 17:06:57 schrieb Alan Cox:
> > Opticon now takes the right mutex to check the port status but the status
> > check is done wrongly for the modern serial code, so fix it.
> 
> As Alan Stern noticed, it seems like we have an ab-ba deadlock here
> between open and resume regarding pm_mutex and port->mutex.

Oh well I guess someone with hardware will have to fix that.

Do we actually need a separate pm_mutex anyway ?
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