netdev - Re: [PATCH net 1/1] mdio_bus: fix mdio_register_device when RESET

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Message-Id: <20191118.180027.1114053540301054943.davem@davemloft.net>
Date:   Mon, 18 Nov 2019 18:00:27 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     marek.behun@....cz
Cc:     netdev@...r.kernel.org, dmitry.torokhov@...il.com, andrew@...n.ch,
        andriy.shevchenko@...ux.intel.com
Subject: Re: [PATCH net 1/1] mdio_bus: fix mdio_register_device when
 RESET_CONTROLLER is disabled

From: Marek Behún <marek.behun@....cz>
Date: Mon, 18 Nov 2019 19:15:05 +0100

> When CONFIG_RESET_CONTROLLER is disabled, the
> devm_reset_control_get_exclusive function returns -ENOTSUPP. This is not
> handled in subsequent check and then the mdio device fails to probe.
> 
> When CONFIG_RESET_CONTROLLER is enabled, its code checks in OF for reset
> device, and since it is not present, returns -ENOENT. -ENOENT is handled.
> Add -ENOTSUPP also.
> 
> This happened to me when upgrading kernel on Turris Omnia. You either
> have to enable CONFIG_RESET_CONTROLLER or use this patch.
> 
> Signed-off-by: Marek Behún <marek.behun@....cz>
> Fixes: 71dd6c0dff51b ("net: phy: add support for reset-controller")

Applied and queued up for -stable.