On Thu, Sep 25, 2014 at 11:14:12AM +0800, Yijing Wang wrote:

Currently, PCI drivers will initialize bus->msi in
pcibios_add_bus(). pcibios_add_bus() will be called
in every pci bus initialization. So the bus->msi
assignment in pci_alloc_child_bus() is useless.

I think this should be the other way around. The default should be to
inherit bus->msi from the parent. That way drivers don't typically have
to do it, yet they can still opt to override it if they need to.

For Tegra for example I think it would work if we assigned the MSI chip
to the root bus (in tegra_pcie_scan_bus()) and then have it propagated
to child busses in pci_alloc_child_bus() so that tegra_pcie_add_bus()
can be removed altogether.

Thierry
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