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
> -----------------------------------------------------------------------
> 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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