linux-kernel - Re: [PATCH] serial: do not call ->pm() on initialization for console port

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Message-ID: <20071018161827.GB16244@flint.arm.linux.org.uk>
Date:	Thu, 18 Oct 2007 17:18:27 +0100
From:	Russell King <rmk+lkml@....linux.org.uk>
To:	Atsushi Nemoto <anemo@....ocn.ne.jp>
Cc:	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH] serial: do not call ->pm() on initialization for console port

On Fri, Oct 19, 2007 at 01:13:55AM +0900, Atsushi Nemoto wrote:
> This commit in current git tree broke serial console for serial_txx9 driver.
> 
> > commit 97d97224ff361e08777fb33e0fd193ca877dac28
> > Author: Russell King <rmk@...-67.arm.linux.org.uk>
> > Date:   Sat Sep 1 21:25:09 2007 +0100
> > 
> >     [SERIAL] Fix console initialisation ordering
> 
> The serial_txx9 driver initialize its port entirely on its ->pm()
> method if new state was 0.  With the commit, serial_core calls ->pm()
> even if the port was used for console.

This'll break some of the ARM drivers, and although I investigated
this a month or so ago, I've completely forgotten the details.

> Attached patch fixes this problem.  Is this a right way?
> If not, I will fix the serial_txx9 driver to skip the initialization in
> ->pm() if oldstate was -1.

I'll have to investigate further to refresh myself with what's going
on here, but your patch looks wrong.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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