linux-kernel - Re: [RFC for-5.8] usb: dwc2: Cleanup debugfs when usb_add_gadget

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Message-ID: <87eep2o027.fsf@kernel.org>
Date:   Thu, 23 Jul 2020 16:03:44 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        "gregkh\@linuxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-usb\@vger.kernel.org" <linux-usb@...r.kernel.org>
Cc:     "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        "marex\@denx.de" <marex@...x.de>,
        "stable\@vger.kernel.org" <stable@...r.kernel.org>
Subject: Re: [RFC for-5.8] usb: dwc2: Cleanup debugfs when usb_add_gadget_udc() fails

Minas Harutyunyan <Minas.Harutyunyan@...opsys.com> writes:

> Hi Martin,
>
> On 6/29/2020 10:03 PM, Martin Blumenstingl wrote:
>> Call dwc2_debugfs_exit() when usb_add_gadget_udc() has failed. This
>> ensure that the debugfs entries created by dwc2_debugfs_init() are
>> cleaned up in the error path.
>> 
>> Fixes: 207324a321a866 ("usb: dwc2: Postponed gadget registration to the udc class driver")
>> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
>> ---
>> This patch is compile-tested only. I found this while trying to
>> understand the latest changes to dwc2/platform.c.
>> 
>> 
>>   drivers/usb/dwc2/platform.c | 4 +++-
>>   1 file changed, 3 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
>> index c347d93eae64..02b6da7e21d7 100644
>> --- a/drivers/usb/dwc2/platform.c
>> +++ b/drivers/usb/dwc2/platform.c
>> @@ -582,12 +582,14 @@ static int dwc2_driver_probe(struct platform_device *dev)
>>   		retval = usb_add_gadget_udc(hsotg->dev, &hsotg->gadget);
>>   		if (retval) {
>>   			dwc2_hsotg_remove(hsotg);
>> -			goto error_init;
>> +			goto error_debugfs;
>>   		}
>>   	}
>>   #endif /* CONFIG_USB_DWC2_PERIPHERAL || CONFIG_USB_DWC2_DUAL_ROLE */
>>   	return 0;
>>   
>> +error_debugfs:
>> +	dwc2_debugfs_exit(hsotg);
>>   error_init:
>>   	if (hsotg->params.activate_stm_id_vb_detection)
>>   		regulator_disable(hsotg->usb33d);
>> 
> I'm Ok with this fix. One more thing. I missed to remove hcd also in 
> fail case. Could you please add dwc2_hcd_remove() call after 
> dwc2_debugfs_exit(hsotg) and submit as patch:
>
> +error_debugfs:
> +	dwc2_debugfs_exit(hsotg);
> +	if (hsotg->hcd_enabled)
> +		dwc2_hcd_remove(hsotg);
>    error_init:

looks like it should be a separate patch though. Right?

-- 
balbi

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