linux-kernel - Re: [PATCH v2] phy: sun4i: check PMU presence when poking unknown bit of pmu

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Date:   Fri, 28 Oct 2016 20:15:53 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     icenowy@...c.xyz, Kishon Vijay Abraham I <kishon@...com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2] phy: sun4i: check PMU presence when poking unknown bit
 of pmu

Hi,

On 28-10-16 18:27, Icenowy Zheng wrote:
> Allwinner SoC's PHY 0, when used as OTG controller, have no pmu part.
> The code that poke some unknown bit of PMU for H3/A64 didn't check
> the PHY, and will cause kernel oops when PHY 0 is used.
>
> This patch will check whether the pmu is not NULL before poking.
>
> Fixes: b3e0d141ca9f (phy: sun4i: add support for A64 usb phy)
>
> Signed-off-by: Icenowy Zheng <icenowy@...c.xyz>
> Acked-by: Maxime Ripard <maxime.ripard@...e-electrons.com>

Patch LGTM too:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans


> ---
>  drivers/phy/phy-sun4i-usb.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
> index b9342a2..fec34f5 100644
> --- a/drivers/phy/phy-sun4i-usb.c
> +++ b/drivers/phy/phy-sun4i-usb.c
> @@ -264,7 +264,7 @@ static int sun4i_usb_phy_init(struct phy *_phy)
>  		return ret;
>  	}
>
> -	if (data->cfg->enable_pmu_unk1) {
> +	if (phy->pmu && data->cfg->enable_pmu_unk1) {
>  		val = readl(phy->pmu + REG_PMU_UNK1);
>  		writel(val & ~2, phy->pmu + REG_PMU_UNK1);
>  	}
>