Re: [PATCH] 8250: option 'force_polling' for buggy IRQs

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From	One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
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Subject	Re: [PATCH] 8250: option 'force_polling' for buggy IRQs
Date	Fri, 29 Jul 2016 11:30:01 +0200
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> Serial consoles are already polled for output.  So nothing should
> care until userspace starts, and the full serial driver initializes.

At which point it hangs

> So I suspect either "irqfixup" or "irqpoll" would handle this for you.
> If not I am certain a small tweak to some of that code would work.

irqfixup won't usually help but irqpoll with HZ=1000 ought to, although
it has its own set of problems because not all devices with non shared
IRQ lines take kindly to irqpoll.

Alan

Thread

Re: [PATCH] 8250: option 'force_polling' for buggy IRQs Max Staudt <mstaudt@suse.de> - 2016-07-26 13:50 +0200
  Re: [PATCH] 8250: option 'force_polling' for buggy IRQs Greg KH <gregkh@linuxfoundation.org> - 2016-07-26 17:10 +0200
    Re: [PATCH] 8250: option 'force_polling' for buggy IRQs Max Staudt <mstaudt@suse.de> - 2016-07-26 18:20 +0200
      Re: [PATCH] 8250: option 'force_polling' for buggy IRQs One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-07-27 14:10 +0200
        Re: [PATCH] 8250: option 'force_polling' for buggy IRQs Max Staudt <mstaudt@suse.de> - 2016-07-27 14:20 +0200
          Re: [PATCH] 8250: option 'force_polling' for buggy IRQs Theodore Ts'o <tytso@mit.edu> - 2016-07-27 15:40 +0200
            Re: [PATCH] 8250: option 'force_polling' for buggy IRQs One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-07-27 22:10 +0200
            Re: [PATCH] 8250: option 'force_polling' for buggy IRQs Max Staudt <mstaudt@suse.de> - 2016-07-28 12:00 +0200
              Re: [PATCH] 8250: option 'force_polling' for buggy IRQs Greg KH <gregkh@linuxfoundation.org> - 2016-07-28 16:50 +0200
                Re: [PATCH] 8250: option 'force_polling' for buggy IRQs Theodore Ts'o <tytso@mit.edu> - 2016-07-28 18:10 +0200
              Re: [PATCH] 8250: option 'force_polling' for buggy IRQs ebiederm@xmission.com (Eric W. Biederman) - 2016-07-28 21:00 +0200
                Re: [PATCH] 8250: option 'force_polling' for buggy IRQs One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-07-29 11:30 +0200
                Re: [PATCH] 8250: option 'force_polling' for buggy IRQs Max Staudt <mstaudt@suse.de> - 2016-07-29 12:00 +0200
                Re: [PATCH] 8250: option 'force_polling' for buggy IRQs ebiederm@xmission.com (Eric W. Biederman) - 2016-07-29 20:00 +0200
                Re: [PATCH] 8250: option 'force_polling' for buggy IRQs One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-08-01 17:30 +0200

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