linux-kernel - Re: Serial ports rearranged in 2.6.22?

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Message-ID: <46C1D4D8.2080202@redhat.com>
Date:	Tue, 14 Aug 2007 12:14:16 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
CC:	Michael Mauch <michael.mauch@....de>, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org, Yinghai Lu <yhlu.kernel@...il.com>
Subject: Re: Serial ports rearranged in 2.6.22?

On 08/13/2007 06:33 PM, Bjorn Helgaas wrote:
> On Monday 13 August 2007 04:28:00 pm Michael Mauch wrote:
>> Bjorn Helgaas wrote:
>>
>>> On Saturday 11 August 2007 09:49:25 am Michael Mauch wrote:
>>>> Yinghai Lu wrote:
>>>>
>>>>> On 8/10/07, Michael Mauch <michael.mauch@....de> wrote:
>>>>>> With 2.6.22 I get the names <-> ports/irqs the other way around:
>>>>>>
>>>>>> 00:08: ttyS0 at I/O 0x2f8 (irq = 3) is a 16550A
>>>>>> 00:09: ttyS1 at I/O 0x3f8 (irq = 4) is a 16550A
>>>>>> ...
>>>>> http://lkml.org/lkml/2007/7/25/455
>>>> Thanks - I applied that patch and the names are back to normal again:
>>>>
>>>> 00:06: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
>>>> 00:07: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
>>> Just FYI, the patch Yinghai mentioned above was experimental, and
>>> we decided it was the wrong solution.
>>>
>>> For 2.6.22, the easiest workaround is to boot with the 
>>> "legacy_serial.force" option.
>> Ah, ok, and load the legacy_serial module. Going from built-in serial to
>> modules I was already challenged to find serial_core, 8250, 8250_pnp
>> and/or 8250_pci (the help in "make menuconfig" does not seem to show the
>> help that is written in the Kconfig file for 8250_pnp and 8250_pci).
> 
> Yes, I messed up the legacy_serial module stuff.
> 
>>> For 2.6.23, we reverted my patch that caused the names to be swapped:
>>>   http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=57d4810ea0d9ca58a7bcc1336607f0cede0a2abf
>> Thanks for the information - I wondered how you decided. 
>>
>> What about 2.6.22.x? Or should the distro kernels use that revert patch
>> for their stable 2.6.22 kernels?
> 
> I would not recommend the experimental patch (http://lkml.org/lkml/2007/7/25/455).
> Using the revert patch is probably safest, since it also avoids
> the module load issues.
> 

Should that be submitted for 2.6.22-stable?
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