linux-kernel - Re: [PATCH net 2/4] net: stmmac: dwmac-sun8i: Balance internal PHY resource references

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Message-ID: <CAGb2v66j+xj-Pq5ijcb+HwLUf0TZkDDnpHcTjj20Q+M2UEtqUQ@mail.gmail.com>
Date:   Mon, 4 Jan 2021 21:42:52 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Corentin Labbe <clabbe@...libre.com>,
        Ondrej Jirman <megous@...ous.com>,
        netdev <netdev@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH net 2/4] net: stmmac: dwmac-sun8i: Balance internal PHY
 resource references

On Sun, Jan 3, 2021 at 7:17 PM Samuel Holland <samuel@...lland.org> wrote:
>
> While stmmac_pltfr_remove calls sun8i_dwmac_exit, the sun8i_dwmac_init
> and sun8i_dwmac_exit functions are also called by the stmmac_platform
> suspend/resume callbacks. They may be called many times during the
> device's lifetime and should not release resources used by the driver.
>
> Furthermore, there was no error handling in case registering the MDIO
> mux failed during probe, and the EPHY clock was never released at all.
>
> Fix all of these issues by moving the deinitialization code to a driver
> removal callback. Also ensure the EPHY is powered down before removal.
>
> Fixes: 634db83b8265 ("net: stmmac: dwmac-sun8i: Handle integrated/external MDIOs")
> Signed-off-by: Samuel Holland <samuel@...lland.org>

Reviewed-by: Chen-Yu Tsai <wens@...e.org>