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

--- Comment #6 from Scott Arnold (scott.c.arnold@nasa.gov) ---

Hello,
I don't know why it makes a difference but according to /proc/interrupts IRQ16
gets about 90 interrupts and stops, when working properly card generates 240
interrupts/second.
Works fine with irqsave/restore in the ehci-hcd isr.
Ehci-hcd is built in and not a module in our configuration.
I am having the card moved to another slot now.

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

https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugzilla.kernel.org%2Fshow_bug.cgi%3Fid%3D214789&amp;data=04%7C01%7Cscott.c.arnold%40nasa.gov%7C551e718474f3400d4b2508d994c8e126%7C7005d45845be48ae8140d43da96dd17b%7C0%7C0%7C637704412758963825%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=qrlaDQOIszpc5Q%2BNbQUxzpDh%2FIyBIvCclogFe2OAAm0%3D&amp;reserved=0

--- 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.

--
You may reply to this email to add a comment.

You are receiving this mail because:
You reported the bug.

-- 
You may reply to this email to add a comment.

You are receiving this mail because:
You are watching the assignee of the bug.