Flushing writes to PCI devices

I've heard that to insure proper synchronization it's necessary to flush
MMIO writes (writel, writew, writeb) to PCI devices by reading from the
same area.  Is this equally true for I/O-space writes (inl, inw, inb)?  
What about configuration space writes (pci_write_config_dword etc.)?

Alan Stern

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