PCI/MSI: Only use the generic MSI layer when domain is hierarchical

Since d8a1cb757550 ("PCI/MSI: Let pci_msi_get_domain use struct
device::msi_domain"), we use the MSI domain associated with the PCI device.

But finding an 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
arch_setup_msi_irq() and arch_teardown_msi_irqs().

Check that the domain we just obtained is hierarchical.  If it is, we can
use the new generic MSI stuff.  Otherwise we have to fall back to the old
arch_setup_msi_irq() and arch_teardown_msi_irqs() interfaces.

This avoids an oops in msi_domain_alloc_irqs() on systems with R-Car,
Tegra, Armada 370, and probably other DesignWare-based host controllers.

Fixes: d8a1cb757550 ("PCI/MSI: Let pci_msi_get_domain use struct device::msi_domain")
Reported-by: Phil Edworthy <[email protected]>
Tested-by: Phil Edworthy <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Acked-by: Thomas Gleixner <[email protected]>
CC: [email protected]	# v4.3+

0 files changed, 0 insertions, 0 deletions