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Date:   Thu, 5 Apr 2018 09:02:01 +0000
From:   Grigor Tovmasyan <Grigor.Tovmasyan@...opsys.com>
To:     Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Amelie Delaunay <amelie.delaunay@...com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v4] usb: dwc2: dwc2_vbus_supply_init: fix error check

On 4/5/2018 12:11 PM, Tomeu Vizoso wrote:
> 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@...com>
>>> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
>>>
>>> ---
>>>
>>> v2: Only overwrite the error in the pointer after checking it (Heiko
>>>        Stübner <heiko@...ech.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@...el.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.

Sorry for inconvenience. We fixed the problem.
No need to rebase.

Thanks,
Grigor.

> 
> Thanks,
> 
> Tomeu
> --
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