linux-kernel - Re: [PATCH: 2/2] [SERIAL] avoid stalling suspend if serial port won't drain

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Message-ID: <20080114102108.1e2aaa89@lxorguk.ukuu.org.uk>
Date:	Mon, 14 Jan 2008 10:21:08 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Russell King <rmk+lkml@....linux.org.uk>
Cc:	Pavel Machek <pavel@....cz>,
	Linux Kernel List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH: 2/2] [SERIAL] avoid stalling suspend if serial port
 won't drain

> - what if its a port with 256 characters in the FIFO, and its programmed
>   for 110 baud?
> - what if loopback isn't supported?
> - what if, while doing this operation, the remote end is sending characters
>   because you can't deassert RTS?

More importantly it is unlikely that serial state will or should survive
across a suspend/resume cycle this way. The chances are you modem did not
suspend and resume the phone call.

Alan
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