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Subject: Re: [PATCH v4] usb: dwc2: dwc2_vbus_supply_init: fix error check
To:     Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Cc:     Felipe Balbi <felipe.balbi@linux.intel.com>,
        Heiko Stuebner <heiko@sntech.de>,
        Amelie Delaunay <amelie.delaunay@st.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>
References: <20180322093943.49717-1-tomeu.vizoso@collabora.com>
 <20180326090001.57627-1-tomeu.vizoso@collabora.com>
 <410670D7E743164D87FA6160E7907A560113AE527D@am04wembxb.internal.synopsys.com>
From:   Tomeu Vizoso <tomeu.vizoso@collabora.com>
Message-ID: <fe9292c5-e90b-96fd-aa73-ea82e7497281@collabora.com>
Date:   Thu, 5 Apr 2018 10:10:44 +0200
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Hi Minas,

On 04/05/2018 09:54 AM, Minas Harutyunyan wrote:
> Hi Tomeu,
> 
> On 3/26/2018 1:01 PM, Tomeu Vizoso wrote:
>> devm_regulator_get_optional returns -ENODEV if the regulator isn't
>> there, so if that's the case we have to make sure not to leave -ENODEV
>> in the regulator pointer.
>>
>> Also, make sure we return 0 in that case, but correctly propagate any
>> other errors. Also propagate the error from _dwc2_hcd_start.
>>
>> Fixes: 531ef5ebea96 ("usb: dwc2: add support for host mode external vbus supply")
>> Cc: Amelie Delaunay <amelie.delaunay@st.com>
>> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
>>
>> ---
>>
>> v2: Only overwrite the error in the pointer after checking it (Heiko
>>       Stübner <heiko@sntech.de>)
>> v3: Remove hunks that shouldn't be in this patch
>> v4: Don't overwrite the error code before returning it (kbuild test
>>       robot <lkp@intel.com>)
>> ---
>>    drivers/usb/dwc2/hcd.c | 13 ++++++++-----
>>    1 file changed, 8 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
>> index 190f95964000..c51b73b3e048 100644
>> --- a/drivers/usb/dwc2/hcd.c
>> +++ b/drivers/usb/dwc2/hcd.c
>> @@ -358,9 +358,14 @@ static void dwc2_gusbcfg_init(struct dwc2_hsotg *hsotg)
>>    
>>    static int dwc2_vbus_supply_init(struct dwc2_hsotg *hsotg)
>>    {
>> +	int ret;
>> +
>>    	hsotg->vbus_supply = devm_regulator_get_optional(hsotg->dev, "vbus");
>> -	if (IS_ERR(hsotg->vbus_supply))
>> -		return 0;
>> +	if (IS_ERR(hsotg->vbus_supply)) {
>> +		ret = PTR_ERR(hsotg->vbus_supply);
>> +		hsotg->vbus_supply = NULL;
>> +		return ret == -ENODEV ? 0 : ret;
>> +	}
>>    
>>    	return regulator_enable(hsotg->vbus_supply);
>>    }
>> @@ -4342,9 +4347,7 @@ static int _dwc2_hcd_start(struct usb_hcd *hcd)
>>    
>>    	spin_unlock_irqrestore(&hsotg->lock, flags);
>>    
>> -	dwc2_vbus_supply_init(hsotg);
>> -
>> -	return 0;
>> +	return dwc2_vbus_supply_init(hsotg);
>>    }
>>    
>>    /*
>>
> 
> Not able to apply patch. Please rebase to balbi/next

Are you sure? Just rebased and the resulting patch is identical to what 
was sent.

Thanks,

Tomeu