Multiport serial port bug in 12 and 13

[David Cross]

Awesome. Thanks!

> On Feb 17, 2021, at 6:37 PM, Warner Losh <imp at bsdimp.com> wrote:
> 
> 
> beta3 is too soon (it's tomorrow which bends the 3-day wait general rule a bit much), but RC1 should be possible.
> 
> Warner
> 
>> On Wed, Feb 17, 2021 at 3:30 PM David Cross <david at crossfamilyweb.com> wrote:
>> Awesome.
>> 
>> Too much of an ask for mfc for beta3?  It is effectively a selective revert of a previous commit
>> 
>> 
>> 
>>>> On Feb 17, 2021, at 5:12 PM, Warner Losh <imp at bsdimp.com> wrote:
>>>> 
>>> 
>>> Committed as 955b6109bb36036e9357006be42dfa89cd7cb0f2
>>> 
>>> Warner
>>> 
>>>> On Tue, Feb 16, 2021 at 12:38 PM David Cross <david at crossfamilyweb.com> wrote:
>>>> I posted an updated bug report (235016) which has been open for 2 years. The patch effectively backs out a change for enabling MSI interrupts on a range of multiport serial cards that never worked in the first place.
>>>> 
>>>> Very low risk change
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