Re: [PATCH] PCI/MSI: Fix MSI IRQ domains for SR-IOV

[Bjorn Helgaas]

[+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>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/