netdev - Re: [PATCH net,stable] qmi_wwan: re-add DW5821e pre-production variant

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Message-Id: <20200210.140249.727550899805828159.davem@davemloft.net>
Date:   Mon, 10 Feb 2020 14:02:49 +0100 (CET)
From:   David Miller <davem@...emloft.net>
To:     bjorn@...k.no
Cc:     netdev@...r.kernel.org, linux-usb@...r.kernel.org,
        larsm17@...il.com, aleksander@...ksander.es
Subject: Re: [PATCH net,stable] qmi_wwan: re-add DW5821e pre-production
 variant

From: Bjørn Mork <bjorn@...k.no>
Date: Sat,  8 Feb 2020 15:50:36 +0100

> Commit f25e1392fdb5 removed the support for the pre-production variant
> of the Dell DW5821e to avoid probing another USB interface unnecessarily.
> However, the pre-production samples are found in the wild, and this lack
> of support is causing problems for users of such samples.  It is therefore
> necessary to support both variants.
> 
> Matching on both interfaces 0 and 1 is not expected to cause any problem
> with either variant, as only the QMI function will be probed successfully
> on either.  Interface 1 will be rejected based on the HID class for the
> production variant:
 ...
> And interface 0 will be rejected based on too few endpoints for the
> pre-production variant:
 ...
> Fixes: f25e1392fdb5 ("qmi_wwan: fix interface number for DW5821e production firmware")
> Link: https://whrl.pl/Rf0vNk
> Reported-by: Lars Melin <larsm17@...il.com>
> Cc: Aleksander Morgado <aleksander@...ksander.es>
> Signed-off-by: Bjørn Mork <bjorn@...k.no>

Applied and queued up for -stable.