PCI: tegra: Save MSI controller in pci_sys_data
Save MSI controller in pci_sys_data instead of assigning MSI controller pointer to every PCI bus in .add_bus(). [bhelgaas: use struct tegra_msi.chip, not ctrl] Signed-off-by: NYijing Wang <wangyijing@huawei.com> Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
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