Daniel Barkalow wrote:
I have a device that supports MSI and INTX-disable, and, with MSI on (and
delivering interrupts successfully) also sends legacy interrupts (on
the IRQ that is no longer associated with the device) unless INTX is
disabled. Without the intx_disable(), the kernel disables the IRQ
entirely and breaks a random other device in my system.
That sort of behavior is an example of why I wrote pci_intx() in the
first place, and employed it by default throughout the ATA drivers
(before it migrated into PCI core).
Jeff
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