Re: [PATCH] PCI: vmd: Free up IRQs on suspend path

["Derrick, Jonathan" <jonathan.derrick@intel.com>]

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On Thu, 2019-02-07 at 12:07 +0100, Greg KH wrote:
> On Wed, Feb 06, 2019 at 02:36:16PM -0700, Sushma Kalakota wrote:
> > commit e2b1820bd5d09 upstream
> > 
> > Free up the IRQs we request on the suspend path and reallocate them
> > on the
> > resume path.
> > 
> > Fixes this error:
> > 
> >   CPU 111 disable failed: CPU has 9 vectors assigned and there are
> > only 0 available.
> >   Error taking CPU111 down: -34
> >   Non-boot CPUs are not disabled
> >   Enabling non-boot CPUs ...
> > 
> > For consistency, this patch also includes the VMD portion of:
> > 3eefa790c9681: PCI: host: Mark PCIe/PCI (MSI) cascade ISR as
> > IRQF_NO_THREAD
> > 
> > CC: Scott Bauer <scott.bauer@intel.com>
> > CC: Bjorn Helgaas <bhelgaas@google.com>
> > CC: Keith Busch <keith.busch@intel.com>
> > Reviewed-by: Jon Derrick <jonathan.derrick@intel.com>
> > Signed-off-by: Sushma Kalakota <sushmax.kalakota@intel.com>
> > ---
> >  drivers/pci/host/vmd.c | 18 +++++++++++++++++-
> >  1 file changed, 17 insertions(+), 1 deletion(-)
> > 
> 
> What stable kernel tree(s) do you want this patch applied to?  And
> why?
> 
> thanks,
> 
> greg k-h

Hi Greg,

This is for 4.9.y and intended to increase reliability of
suspend/resume not leading to a failure to suspend or failure to
resume, either of which would be undesireable to users of the feature,
and potentially make the overall feature unusable if suspend/resume
were user requirement.

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