linux-kernel - Re: [ 061/128] 8250: blacklist Winbond CIR port

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Date:	Mon, 04 Feb 2013 00:23:51 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Sean Young <sean@...s.org>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	akpm@...ux-foundation.org, Alan Cox <alan@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [ 061/128] 8250: blacklist Winbond CIR port

On Sun, 2013-02-03 at 17:26 +0000, Sean Young wrote:
> On Sun, Feb 03, 2013 at 03:47:45PM +0100, Ben Hutchings wrote:
> > 3.2-stable review patch.  If anyone has any objections, please let me know.
> > 
> > ------------------
> > 
> > From: Sean Young <sean@...s.org>
> > 
> > commit 65ecc9c02dbad033a73a32916d17c107c5b25031 upstream.
> > 
> > The legacy serial driver will detect the Winbond CIR device as a serial
> > port, since it looks exactly like a serial port unless you know what
> > it is from the PNP ID.
> > 
> > Here we track this port as a special PORT_8250_CIR type, preventing the
> > legacy serial driver from probing it.
> 
> This commit relies on an earlier commit which ensures that 8250 PNP probe
> is done before legacy 8250 probe, else the Winbond CIR device will be 
> claimed by the legacy 8250 driver rendering above commit useless.
>
> commit 835d844d1a28efba81d5aca7385e24c29d3a6db2
> Author: Sean Young <sean@...s.org>
> Date:   Fri Sep 7 19:06:23 2012 +0100
> 
>     8250_pnp: do pnp probe before legacy probe
>     
>     We first probe the legacy serial ports and then check pnp. If there
>     is a non-standard configuration then this might not work, also this
>     change is needed so we can blacklist Winbond CIR based on PNP ID.
>     
>     For this to work the 8250_pnp driver must be merged into the 8250
>     module.

That looks a bit too disruptive for stable.  I added the Winbond CIR
patch because commit ebebd49a8eab ('8250/16?50: Add support for Broadcom
TruManage redirected serial port') textually depends on it and it looked
like a worthwhile fix too.  Since this doesn't do anything on its own,
I'll drop it and rebase the TruManage patch.

Ben.

-- 
Ben Hutchings
Everything should be made as simple as possible, but not simpler.
                                                           - Albert Einstein

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