On Thu, 2016-03-31 at 09:40 -0400, Bjorn Helgaas wrote:
> Hi Rob,
>
> On Thu, Mar 31, 2016 at 09:26:35AM -0400, Rob Groner wrote:
> > We became aware of an issue with our Linux drivers when used with a 4.4
> > kernel. These drivers had worked previously from 2.6.35 to 4.2 kernels.
> > The symptoms were that, even though the request_irq() call was
> > successful, we did not receive any IRQs. IRQs did arrive on a different
> > IRQ line, however, and the kernel disabled that line because there was
> > no handler.
>
> Others have seen similar issues, so we reverted 991de2e59090 ("PCI, x86:
> Implement pcibios_alloc_irq() and pcibios_free_irq()").
>
> The revert, 6c777e8799a9 ("Revert "PCI, x86: Implement pcibios_alloc_irq()
> and pcibios_free_irq()""), appeared in v4.5-rc6, so if you try that or a
> later kernel (including v4.5), it should work.
>
> Let us know if you still see problems.
>
> Bjorn
Thank you! I will try the 4.5 kernel from kernel.org today.
Rob
> > -----------------------------------------------------------------------
> > rtd@kernel-dev:~/git/kernels/linux$ git bisect good
> > 991de2e59090e55c65a7f59a049142e3c480f7bd is the first bad commit
> > commit 991de2e59090e55c65a7f59a049142e3c480f7bd
> > Author: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
> > Date: Wed Jun 10 16:54:59 2015 +0800
> >
> > PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq()
> >
> > To support IOAPIC hotplug, we need to allocate PCI IRQ resources on
> > demand
> > and free them when not used anymore.
> >
> > Implement pcibios_alloc_irq() and pcibios_free_irq() to dynamically
> > allocate and free PCI IRQs.
> >
> > Remove mp_should_keep_irq(), which is no longer used.
> >
> > [bhelgaas: changelog]
> > Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
> > Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> > Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> >
> > :040000 040000 765e2d5232d53247ec260b34b51589c3bccb36ae
> > f680234a27685e94b1a35ae2a7218f8eafa9071a M arch
> > :040000 040000 d55a682bcde72682e883365e88ad1df6186fd54d
> > f82c470a04a6845fcf5e0aa934512c75628f798d M drivers
> > ----------------------------------------------------------------
> >
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