linux-kernel - Re: MPC8343 - serial8250: too much work

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Message-ID: <d970ff420906020624r6988e99aq2d3ddae26e0d6585@mail.gmail.com>
Date:	Tue, 2 Jun 2009 10:24:15 -0300
From:	Alemao <xcarandiru@...il.com>
To:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: MPC8343 - serial8250: too much work

Hi all,

In a normal situation, I have something like this:

serial8250_interrupt()
serial8250_handle_port()
transmit_chars()
pass_counter: 0
serial8250_handle_port()
pass_counter: 1
serial8250_handle_port()
pass_counter: 2
pass_counter: 3

But when the problem happends:

serial8250_interrupt(16)
serial8250_handle_port()
transmit_chars()
uart_circ_empty()
pass_counter: 0
.
.
.
serial8250_handle_port()
transmit_chars()
uart_circ_empty()
pass_counter: 257
serial8250: too much work for irq16

If the circ buffer is empty, why iterate 256 times?

How can I trace the application that is calling serial routines?

Its difficult to debug cause I use serial console to communicate with the board.

Thanks in advance,

--
Alemao
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