[Bug 214789] ehci-hcd.c ISR

[bugzilla-daemon@bugzilla.kernel.org]

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

--- Comment #4 from Scott Arnold (scott.c.arnold@nasa.gov) ---
Hello,
Timing card is not receiving interrupts when sharing a IRQ (16) with the
ehci-hcd driver and the 5.11.17  (also tried 5.14.13) kernel.
I changed the spin_lock/spin_unlock back to spin_lock_irqsave/irqrestore in
ehci_irq in the 5.14.13 kernel and timing card now getting interrupts as
expected.
The 5.3 (and probably prior although I have not checked) are using the
irqsave/restore versions of spinlock in ehci_irq.
From 5.3:
       /*
         * For threadirqs option we use spin_lock_irqsave() variant to prevent
         * deadlock with ehci hrtimer callback, because hrtimer callbacks run
         * in interrupt context even when threadirqs is specified. We can go
         * back to spin_lock() variant when hrtimer callbacks become threaded.
         */
        spin_lock_irqsave(&ehci->lock, flags);

Thanks
Scott

-----Original Message-----
From: bugzilla-daemon@bugzilla.kernel.org <bugzilla-daemon@bugzilla.kernel.org> 
Sent: Thursday, October 21, 2021 11:03 AM
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 #3 from Alan Stern (stern@rowland.harvard.edu) --- Can you provide
more information about exactly what goes wrong?  And why shared IRQs should
make any difference?

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