linux-kernel - Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt handler

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Message-ID: <20080204133925.73733f5f@dhcp-252-066.norway.atmel.com>
Date:	Mon, 4 Feb 2008 13:39:25 +0100
From:	Haavard Skinnemoen <hskinnemoen@...el.com>
To:	"Remy Bohmer" <linux@...mer.net>
Cc:	michael <trimarchi@...dalf.sssup.it>, fabio@...dalf.sssup.it,
	"Andrew Victor" <linux@...im.org.za>,
	"Chip Coldwell" <coldwell@...hat.com>,
	"Marc Pignat" <marc.pignat@...s.ch>,
	"David Brownell" <david-b@...bell.net>,
	linux-kernel@...r.kernel.org, "Alan Cox" <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt handler

On Thu, 31 Jan 2008 20:36:25 +0100
"Remy Bohmer" <linux@...mer.net> wrote:

> A long shot, but can it be that the ringbuffer overflows, and that
> therefor characters are lost?

That's what I was thinking too. If this is indeed the cause, the
dev_err() added by the debug patch I posted should trigger and we may
consider boosting the priority of the tasklet (using
tasklet_hi_schedule.)

Other solutions may involve trying to figure out what exactly is
blocking the tasklet from running. I have a patch series for the macb
driver that optimizes the RX processing a bit, but it obviously won't
help at91rm9200 since it uses a different driver...

Haavard
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