linux-kernel - Re: [PATCH v2 2/2] usb: misc: onboard_hub: Fail silently when there is no platform device

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Date:   Thu, 22 Dec 2022 13:21:16 +0100
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Matthias Kaehlcke <mka@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        stable@...r.kernel.org, Douglas Anderson <dianders@...omium.org>,
        Ravi Chandra Sadineni <ravisadineni@...omium.org>
Subject: Re: [PATCH v2 2/2] usb: misc: onboard_hub: Fail silently when there
 is no platform device

Am 22.12.22 um 03:26 schrieb Matthias Kaehlcke:
> Some boards with an onboard USB hub supported by the onboard_hub
> driver have a device tree node for the hub, but the node doesn't
> specify all properties needed by the driver (which is not a DT
> error per se). For such a hub no onboard_hub platform device is
> created. However the USB portion of the onboard hub driver still
> probes and uses _find_onboard_hub() to find the platform device
> that corresponds to the hub. If the DT node of the hub doesn't
> have an associated platform device the function looks for a
> "peer-hub" node (to get the platform device from there), if
> that doesn't exist either it logs an error and returns -EINVAL.
>
> The absence of a platform device is expected in some
> configurations, so drop the error log and fail silently with
> -ENODEV.
>
> Fixes: 8bc063641ceb ("usb: misc: Add onboard_usb_hub driver")
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
>
Tested-by: Stefan Wahren <stefan.wahren@...e.com>