Flushing writes to PCI devices

[Alan Stern]

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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