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Subject: Re: [PATCH] serial: pmac_zilog: don't init if zilog is not available
To:     Finn Thain <fthain@telegraphics.com.au>
Cc:     Brad Boyer <brad@allandria.com>,
        Greg KH <gregkh@linuxfoundation.org>,
        linux-kernel@vger.kernel.org, Joshua Thompson <funaho@jurai.org>,
        linux-serial@vger.kernel.org,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        linux-m68k@lists.linux-m68k.org,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Paul Mackerras <paulus@samba.org>,
        linuxppc-dev@lists.ozlabs.org,
        Michael Ellerman <mpe@ellerman.id.au>
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From:   Laurent Vivier <laurent@vivier.eu>
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Message-ID: <8407af95-09a0-bc94-68c6-60dc79756fec@vivier.eu>
Date:   Thu, 22 Oct 2020 09:16:46 +0200
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Le 22/10/2020 à 05:23, Finn Thain a écrit :
> On Wed, 21 Oct 2020, Laurent Vivier wrote:
> 
>> Le 21/10/2020 à 01:43, Finn Thain a écrit :
>>
>>> Laurent, can we avoid the irq == 0 warning splat like this?
>>>
>>> diff --git a/drivers/tty/serial/pmac_zilog.c b/drivers/tty/serial/pmac_zilog.c
>>> index 96e7aa479961..7db600cd8cc7 100644
>>> --- a/drivers/tty/serial/pmac_zilog.c
>>> +++ b/drivers/tty/serial/pmac_zilog.c
>>> @@ -1701,8 +1701,10 @@ static int __init pmz_init_port(struct uart_pmac_port *uap)
>>>  	int irq;
>>>  
>>>  	r_ports = platform_get_resource(uap->pdev, IORESOURCE_MEM, 0);
>>> +	if (!r_ports)
>>> +		return -ENODEV;
>>>  	irq = platform_get_irq(uap->pdev, 0);
>>> -	if (!r_ports || irq <= 0)
>>> +	if (irq <= 0)
>>>  		return -ENODEV;
>>>  
>>>  	uap->port.mapbase  = r_ports->start;
>>>
>>
>> No, this doesn't fix the problem.
>>
> 
> Then I had better stop guessing and start up Aranym...
> 
> The patch below seems to fix the problem for me. Does it work on your 
> system(s)?

It works like a charm.

Thank you,
Laurent