Date: Tue, 14 Jan 2014 12:08:11 +0000
From: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
To: Pavel Roskin <proski@gnu.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jiri Slaby <jslaby@suse.cz>, linux-kernel@vger.kernel.org
Subject: Re: serial8250: bogus low_latency destabilizes kernel, need sanity
 check
Message-ID: <20140114120811.648571ea@alan.etchedpixels.co.uk>
In-Reply-To: <20140113193547.47b7a646@IRBT4585>
References: <20140113193547.47b7a646@IRBT4585>
Organization: Intel Corporation
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Sender: linux-kernel-owner@vger.kernel.org

> 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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