[Bug 214789] ehci-hcd.c ISR

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https://bugzilla.kernel.org/show_bug.cgi?id=214789

--- Comment #8 from Alan Stern (stern@xxxxxxxxxxxxxxxxxxx) ---
How many of those 90 interrupts were issued by the EHCI host controller as
opposed to the card?

Are there any USB devices attached to the host controller?  What does
/sys/kernel/debug/usb/devices have to say?

Does the card use edge-triggered interrupts rather than level-triggered?

Have you tried adding any debugging messages to ehci_irq to find out what's
going on when it runs?

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