linux-kernel - Re: [PATCH] usb: cdc_acm: Add quirk for Elatec TWN3

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Date:   Mon, 16 Oct 2017 13:26:18 +0200
From:   Oliver Neukum <oneukum@...e.com>
To:     Maksim Salau <msalau@...echa.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH] usb: cdc_acm: Add quirk for Elatec TWN3

Am Mittwoch, den 11.10.2017, 11:10 +0300 schrieb Maksim Salau:
> Elatec TWN3 has the union descriptor on data interface. This results in
> failure to bind the device to the driver with the following log:
>   usb 1-1.2: new full speed USB device using streamplug-ehci and address 4
>   usb 1-1.2: New USB device found, idVendor=09d8, idProduct=0320
>   usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
>   usb 1-1.2: Product: RFID Device (COM)
>   usb 1-1.2: Manufacturer: OEM
>   cdc_acm 1-1.2:1.0: Zero length descriptor references
>   cdc_acm: probe of 1-1.2:1.0 failed with error -22
> 
> Adding the NO_UNION_NORMAL quirk for the device fixes the issue.
> 
> Signed-off-by: Maksim Salau <msalau@...echa.com>
Acked-by: Oliver Neukum <oneukum@...e.com>