Re: PCI IRQ issue since 4.2 kernel

[Rob Groner <rgroner@rtd.com>]

On Thu, 2016-03-31 at 10:14 -0500, Bjorn Helgaas wrote:
> On Thu, Mar 31, 2016 at 11:05:57AM -0400, Rob Groner wrote:
> > 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
> > 
> > I installed the 4.5 kernel from https://na01.safelinks.protection.outlook.com/?url=kernel.org&data=01%7c01%7crgroner%40rtd.com%7c008e1e58aa0c4690a8b208d359771c14%7c16f82b7977b8423dbafdd6c19032e267%7c1&sdata=rZhvAmnOFRBM9kCk97hFxVJ4Q%2fharqu1CpSfPhyawyY%3d and my issue has been
> > resolved.  Thank you very much!
> > 
> > Will this revert possibly make it into 4.3 and 4.4, or will I have to
> > tell people to avoid those versions?
> 
> Shoot, I forgot to mark that revert for stable.  I'll see if I can
> figure out how to do that after the fact.  Of course, you'll still
> have to tell people to use the latest 4.3.x or 4.4.x stable kernels,
> not the original 4.3 and 4.5.
> 
> Bjorn

Ok, will do.  Thanks!

Rob