serial/8250: Increase number of serial ports detected to 32

[Yegor Yefremov]

On Fri, Nov 12, 2010 at 5:11 PM, Yegor Yefremov
<yegorslists at googlemail.com> wrote:
> On Fri, Nov 12, 2010 at 9:47 AM, Andy Whitcroft <apw at canonical.com> wrote:
>> On Thu, Nov 11, 2010 at 09:18:22AM +0100, Yegor Yefremov wrote:
>>> Hello,
>>>
>>> our company is developing multi port serial cards among other
>>> products. The main problem is, when the customers first install this
>>> devices especially those with 8 ports, they get only 2-3 ports
>>> detected, cause CONFIG_SERIAL_8250_RUNTIME_UARTS is set to 4. There
>>> are also many such requests all over the net. Serial interface is
>>> still not dead in spite of new technologies. So this change is really
>>> needed. I tried to propagate this change to serial tree maintainers,
>>> but it ended in proposal to change this through Linux distribution
>>> maintainers. After all they configure the kernels themselves, not
>>> necessarily using kernel default values. See this thread:
>>> http://www.spinics.net/lists/linux-serial/msg03020.html
>>>
>>> What do you think about this? Should I open a bug request?
>>
>> I would be interested to know if there are any downsides to increasing
>> this, are static structures sized based on it etc.
>
> Actually you have already spent this memory with defining
> CONFIG_SERIAL_8250_NR_UARTS = 48. So there is almost no difference.
>
>> A bug is probabally appropriate, please do reply with the number on this
>> thread so we can find it easily.
>
> I'll open a bug request next week. As for now see the same bug request
> by opensuse: https://bugzilla.novell.com/show_bug.cgi?id=652954.

I've filed a bug:
https://bugs.launchpad.net/ubuntu/+source/linux-meta/+bug/675453

Yegor