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

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Message-Id: <1243817268.4375.28.camel@concordia>
Date:	Mon, 01 Jun 2009 10:47:48 +1000
From:	Michael Ellerman <michael@...erman.id.au>
To:	Alemao <xcarandiru@...il.com>
Cc:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: MPC8343 - serial8250: too much work

On Fri, 2009-05-29 at 17:07 -0300, Alemao wrote:
> Im facing some problems with serial, linux-2.6.23, getting flooded
> with this message in logs:
> 
> ---
> serial8250: too much work for irq16
> ---
> 
> Something I notice, in my .dts I have the following lines:
> 
> serial0: serial@...0,  interrupts   =  <9  0x8>
> serial1: serial@...0,  interrupts   =  <10 0x8>
> spi:       spi@...0,     interrupts   =  <16 0x8>
> 
> 
> But when kernel starts:
> 
> ---
> Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
> serial8250.0: ttyS0 at MMIO 0xe0004500 (irq = 16) is a 16550A
> ---
> 
> Why IRQ 16? Shouldn't it be IRQ 9?

No. Interrupt numbers are remapped on powerpc. If you were running a
mainline kernel you'd see a message something like:

irq: irq 9 on host ?? mapped to virtual irq 16

cheers


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