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

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Date:   Sat, 5 Nov 2016 11:18:37 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Hans de Goede <hdegoede@...hat.com>, <icenowy@...c.xyz>,
        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



On Friday 28 October 2016 11:45 PM, Hans de Goede wrote:
> 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>

merged, thanks.

-Kishon
> 
> 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);
>>      }
>>