linux-kernel - Re: serial8250: bogus low_latency destabilizes kernel, need sanity check

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Message-ID: <20140114120811.648571ea@alan.etchedpixels.co.uk>
Date:	Tue, 14 Jan 2014 12:08:11 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Pavel Roskin <proski@....org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org
Subject: Re: serial8250: bogus low_latency destabilizes kernel, need sanity
 check

> Maybe we should unset the low_latency flag as soon as DMA fails?  There
> are two flags, one is state->uart_port->flags and the other is
> port->low_latency.  I guess we need to unset both.

Well low latency and DMA are pretty much exclusive in the real world so
probably DMA ports shouldn't allow low_latency to be set at all in DMA
mode.

Alan
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