Re: Possible bug in xhci-ring.c

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Hi Maciej,

On Tue, Jul 15, 2014 at 11:29 AM, Maciej Puzio <mx34567@xxxxxxxxx> wrote:
> Julius, I tested the patch on kernel 3.2.61, on two USB 3.0 host
> controllers (Asmedia and NEC), and four USB 3.0 devices (three of
> which were previously triggering the issue, and one worked fine). On
> the Asmedia controller, the patch fixes the regression, but with one
> of the devices (Areca ARC-5040) I still occasionally get the following
> messages in the log:
>
> Jul 15 12:34:50 ubuntu kernel: [ 1855.902804] usb 4-1: reset
> SuperSpeed USB device number 2 using xhci_hcd
> Jul 15 12:34:50 ubuntu kernel: [ 1855.920190] xhci_hcd 0000:03:00.0:
> xHCI xhci_drop_endpoint called with disabled ep ffff880423628480
> Jul 15 12:34:50 ubuntu kernel: [ 1855.920197] xhci_hcd 0000:03:00.0:
> xHCI xhci_drop_endpoint called with disabled ep ffff8804236284c0
>
> These messages appear out of nowhere, seemingly without any cause,
> usually some time after the device has been plugged in (time varies
> from 30 sec to 30 min). This worries me a little, because these exact
> messages were one of the symptoms of the regression. However, the
> device seems to work fine and remains accessible. Without your patch,
> such messages were logged every 30 seconds, and the device was not
> accessible until they stopped.
> I did not notice any problems with other devices on the Asmedia
> controller (with the patch), nor with any devices on the NEC
> controller (with or without the patch).

I *think* those messages are harmless. I've seen them often enough in
other logs, they shouldn't have anything to do with this bug. You
would probably see them without either of my two patches as well.

> I have not yet tested any other kernel version; I intend to compile
> and test the newest available kernel tomorrow. Where should I add the
> "Tested-by" tag?

Just respond with 'Tested-by: Your Name <email>' to the patch email
and the the maintainer should merge that into the commit message when
he picks it up (at least that's how I've seen this done before).
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