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The PCIe DWC host controller is now using MSI (Message-signaled-interrupts) by default. While ath9k itself does support MSI here, a lot of wlan adapters do not. Avoid non-functioning cards by simply continue to disable MSI for now. This can be done by appending "pci=nomsi" to the boot cmdline. Also an extra fix needs to be backported which avoids MSI initialization which prevented legacy IRQ's init from taking over. Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>