[+cc Joerg]
On Fri, Sep 18, 2015 at 03:08:54PM -0600, Alex Williamson wrote:
> SR-IOV creates a virtual bus where bus->self is NULL. This results
> in a segfault as VFs are added and we scan for an MSI domain without
> taking that into account. Detect this and scan up to the parent bus
> until we find a real bridge.
>
> Fixes: 44aa0c657e3e ("PCI/MSI: Add hooks to populate the msi_domain field")
> Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
Applied to for-linus with changelog below for v4.3, thanks!
PCI/MSI: Fix MSI IRQ domains for VFs on virtual buses
SR-IOV creates a virtual bus where bus->self is NULL. When we add VFs and
scan for an MSI domain, pci_set_bus_msi_domain() dereferences bus->self,
which causes a kernel NULL pointer dereference oops.
Scan up to the parent bus until we find a real bridge where we can get the
MSI domain.
[bhelgaas: changelog]
Fixes: 44aa0c657e3e ("PCI/MSI: Add hooks to populate the msi_domain field")
Tested-by: Joerg Roedel <joro@xxxxxxxxxx>
Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <helgaas@xxxxxxxxxx>
Acked-by: Marc Zyngier <marc.zyngier@xxxxxxx>
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