[Bug 214789] ehci-hcd.c ISR

[bugzilla-daemon@bugzilla.kernel.org]

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

--- Comment #10 from Johan Hovold (johan@kernel.org) ---
On Thu, Oct 21, 2021 at 08:04:06PM +0000, bugzilla-daemon@bugzilla.kernel.org
wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=214789
> 
> --- Comment #9 from Scott Arnold (scott.c.arnold@nasa.gov) ---
> Hello,
> The timing card driver receives no interrupts according to debug.
> IRQ16:  IO-APIC   16-fasteoi   ehci_hcd:usb1, hpilo, rt_pcclk

So the IRQ is also shared with some (mainline) HP management-processor
driver (hpilo).

> Ehci_hcd entries in /sys/kernel/debug/usb/devices:
> 
> T:  Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=480  MxCh= 2
> B:  Alloc=  0/800 us ( 0%), #Int=  4, #Iso=  0
> D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
> P:  Vendor=1d6b ProdID=0002 Rev= 5.11
> S:  Manufacturer=Linux 5.11.17_OBCS_1 ehci_hcd
> S:  Product=EHCI Host Controller
> S:  SerialNumber=0000:00:1a.0
> C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=  0mA
> I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
> E:  Ad=81(I) Atr=03(Int.) MxPS=   4 Ivl=256ms

Just to be clear: Are there any USB devices physically connected to this
bus?

What does "lsusb -s1:" say?

> I have not tried enabling debug in ehci_hcd yet.

Try adding

        WARN_ON_ONCE(!irqs_disabled());

at the start of ehci_irq() before grabbing the lock.

That should give us a stack dump in case there's someone calling the
interrupt handler with interrupts enabled (which seems to be the case).

Johan

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