[Bug 214789] ehci-hcd.c ISR

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

--- Comment #7 from Scott Arnold (scott.c.arnold@nasa.gov) ---
Anything you want me to try while I have the hardware available?

-----Original Message-----
From: bugzilla-daemon@bugzilla.kernel.org <bugzilla-daemon@bugzilla.kernel.org> 
Sent: Thursday, October 21, 2021 2:28 PM
To: Arnold, Scott C. (JSC-CD13)[SGT, INC] <scott.c.arnold@nasa.gov>
Subject: [EXTERNAL] [Bug 214789] ehci-hcd.c ISR

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--- Comment #5 from Alan Stern (stern@rowland.harvard.edu) --- Okay, but _why_
don't the timing card's interrupts get handled when ehci_irq uses spin_lock? 
And _why_ does changing to spin_lock_irqsave make a difference?

Do all of the card's interrupt requests get lost or only some of them?

Are you somehow getting recursive (nested) interrupts for the same IRQ line?

Is ehci_irq somehow getting called with interrupts enabled?

I don't want to make any changes to the driver until we know the answers to
these questions.

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