linux-kernel - Re: [PATCH] AT91 Serial: update the powersave handler to match serial core

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Message-ID: <20080919171115.08594550@hskinnemo-gx745.norway.atmel.com>
Date:	Fri, 19 Sep 2008 17:11:15 +0200
From:	Haavard Skinnemoen <haavard.skinnemoen@...el.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Anti Sullin <anti.sullin@...ecdesign.ee>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] AT91 Serial: update the powersave handler to match
 serial core

Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> > Maybe the tty layer ensures that the buffer is empty before
> > suspending...would be interesting to know. In any case, any such bug  
> 
> It doesn't - but calling tty_wait_until_sent(tty, some_timeout) will do
> that for you providing you call it in a sleep capable context.

Looks like it doesn't matter -- the serial core shuts the port down
completely, which will among other things disable the DMA controller.

Haavard
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