linux-kernel - Re: [PATCH] phy: rockchip-typec: Check for errors from tcphy_phy

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Message-ID: <CABXOdTdukST-8tRh6Z2mRTFYwseiknEzB7FL+uiz_PxYrYYjgw@mail.gmail.com>
Date:   Sat, 30 Sep 2017 03:38:18 -0700
From:   Guenter Roeck <groeck@...gle.com>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Guenter Roeck <groeck@...omium.org>,
        Chris <zyw@...k-chips.com>, wulf <wulf@...k-chips.com>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] phy: rockchip-typec: Check for errors from tcphy_phy_init()

On Fri, Sep 29, 2017 at 4:58 PM, Douglas Anderson <dianders@...omium.org> wrote:
> The function tcphy_phy_init() could return an error but the callers
> weren't checking the return value.  They should.  In at least one case
> while testing I saw the message "wait pma ready timeout" which
> indicates that tcphy_phy_init() really could return an error and we
> should account for it.
>
> Signed-off-by: Douglas Anderson <dianders@...omium.org>

Reviewed-by: Guenter Roeck <groeck@...omium.org>

> ---
>
>  drivers/phy/rockchip/phy-rockchip-typec.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/phy/rockchip/phy-rockchip-typec.c b/drivers/phy/rockchip/phy-rockchip-typec.c
> index 4d2c57f21d76..38831eebc934 100644
> --- a/drivers/phy/rockchip/phy-rockchip-typec.c
> +++ b/drivers/phy/rockchip/phy-rockchip-typec.c
> @@ -685,8 +685,11 @@ static int rockchip_usb3_phy_power_on(struct phy *phy)
>         if (tcphy->mode == new_mode)
>                 goto unlock_ret;
>
> -       if (tcphy->mode == MODE_DISCONNECT)
> -               tcphy_phy_init(tcphy, new_mode);
> +       if (tcphy->mode == MODE_DISCONNECT) {
> +               ret = tcphy_phy_init(tcphy, new_mode);
> +               if (ret)
> +                       goto unlock_ret;
> +       }
>
>         /* wait TCPHY for pipe ready */
>         for (timeout = 0; timeout < 100; timeout++) {
> @@ -760,10 +763,12 @@ static int rockchip_dp_phy_power_on(struct phy *phy)
>          */
>         if (new_mode == MODE_DFP_DP && tcphy->mode != MODE_DISCONNECT) {
>                 tcphy_phy_deinit(tcphy);
> -               tcphy_phy_init(tcphy, new_mode);
> +               ret = tcphy_phy_init(tcphy, new_mode);
>         } else if (tcphy->mode == MODE_DISCONNECT) {
> -               tcphy_phy_init(tcphy, new_mode);
> +               ret = tcphy_phy_init(tcphy, new_mode);
>         }
> +       if (ret)
> +               goto unlock_ret;
>
>         ret = readx_poll_timeout(readl, tcphy->base + DP_MODE_CTL,
>                                  val, val & DP_MODE_A2, 1000,
> --
> 2.14.2.822.g60be5d43e6-goog
>