On Thu, 3 Dec 2015 18:27:59 -0600
Bjorn Helgaas <helgaas@xxxxxxxxxx> wrote:
> On Mon, Nov 30, 2015 at 10:25:34AM +0000, Phil Edworthy wrote:
> > Cc'd linux-pci ml
> >
> > On 23 November 2015 14:27, Marc Zyngier wrote:
> >
> > Since d8a1cb757550 ("PCI/MSI: Let pci_msi_get_domain use struct
> > device::msi_domain"), we use the MSI domain associated to the PCI device.
> >
> > But finding a MSI domain doesn't mean that the domain is implemented
> > using the generic MSI domain API, and a number of MSI controllers
> > are still using the arch_setup_msi_irq/arch_teardown_msi_irqs.
> >
> > In order to avoid a firework on these systems, check that the domain
> > we just obtained is hierarchical. If not, don't use the generic MSI
> > stuff and stick with the old one. Not pretty, but reliable.
> >
> > Another insentive to rework those drivers and phase out this API.
> >
> > Reported-by: Phil Edworthy <phil.edworthy@xxxxxxxxxxx>
> > Tested-by: Phil Edworthy <phil.edworthy@xxxxxxxxxxx>
> > Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
>
> Thanks, I applied this with Thomas' ack to pci/msi for v4.5.
>
> It looks like d8a1cb757550 appeared in v4.3. Is this a fix for that
> commit? Does this need to be backported via a stable tag?
Hi Bjorn,
I think this really deserves to be queued as an immediate fix for 4.4
rather than 4.5, as some systems in mainline are affected by this bug:
http://www.spinics.net/lists/arm-kernel/msg465792.html
It would also deserve a stable tag for 4.3.
Thanks,
M.
--
Without deviation from the norm, progress is not possible.
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