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From: Oliver Neukum <oneukum@suse.com>
To: "Schmid, Carsten" <Carsten_Schmid@mentor.com>,
	"f.fainelli@gmail.com" <f.fainelli@gmail.com>
Cc: "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>
Subject: Re: AW: Strange behaviour of D-Link DUB-1312 USB 3.0 Adapters
Date: Wed, 14 Aug 2019 15:07:53 +0200
Message-ID: <1565788073.25764.8.camel@suse.com> (raw)
In-Reply-To: <f5e22fea4e1c4baeb2fc98d324ad9060@SVR-IES-MBX-03.mgc.mentorg.com>

Am Mittwoch, den 14.08.2019, 08:56 +0000 schrieb  Schmid, Carsten :

> > This is on a lower layer than ax88179. This comes from xhci_hcd.
> > Is this a regression?
> > 
> 
> I don't think its a regression.

It would be better to know than to assume.

> Is there something i can do to force an error message to be seen
> when the ETH2USB adapter stalls?

You can activate dynamic debugging for the xhci_hcd module
Remember that no data to transfer is not an error as such.

> My current assumption is that the signal quality of the USB port is at a
> corner case, and therefore some "better" Adapters work, some "bad ones"
> don't. But as there is no error message seen in the dmesg, i am somehow lost.

Two things you can do:

1. Generate a usbmon trace (it will be gigantic though)
2. Activate dynamic debugging for the xhci_hcd module


	Regards
		Oliver


  parent reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-14  8:17 Schmid, Carsten
2019-08-14  8:31 ` Oliver Neukum
2019-08-14  8:56   ` AW: " Schmid, Carsten
2019-08-14 10:22     ` Schmid, Carsten
2019-08-14 13:07     ` Oliver Neukum [this message]
2019-08-15 12:02       ` AW: " Schmid, Carsten
2019-08-16 11:56         ` Schmid, Carsten
2019-08-19 12:11         ` Oliver Neukum
2019-08-19 12:27           ` AW: " Schmid, Carsten

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