linux-kernel - Re: [PATCH v9 2/6] usb:gadget Separated decoding functions from dwc3 driver.

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Message-ID: <b66216dd-6fcf-2900-e67b-42fdb81af78a@ti.com>
Date:   Wed, 7 Aug 2019 13:17:39 +0300
From:   Roger Quadros <rogerq@...com>
To:     Pawel Laszczak <pawell@...ence.com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "hdegoede@...hat.com" <hdegoede@...hat.com>,
        "heikki.krogerus@...ux.intel.com" <heikki.krogerus@...ux.intel.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jbergsagel@...com" <jbergsagel@...com>,
        "nsekhar@...com" <nsekhar@...com>, "nm@...com" <nm@...com>,
        Suresh Punnoose <sureshp@...ence.com>,
        "peter.chen@....com" <peter.chen@....com>,
        Jayshri Dajiram Pawar <jpawar@...ence.com>,
        Rahul Kumar <kurahul@...ence.com>
Subject: Re: [PATCH v9 2/6] usb:gadget Separated decoding functions from dwc3
 driver.



On 05/07/2019 14:44, Pawel Laszczak wrote:
> 
>> EXTERNAL MAIL
>>
>>
>>
>> Hi,
>>
>> Pawel Laszczak <pawell@...ence.com> writes:
>>> diff --git a/include/linux/usb/ch9.h b/include/linux/usb/ch9.h
>>> index da82606be605..d388a3a5ab7e 100644
>>> --- a/include/linux/usb/ch9.h
>>> +++ b/include/linux/usb/ch9.h
>>> @@ -70,4 +70,29 @@ extern enum usb_device_speed usb_get_maximum_speed(struct device *dev);
>>>   */
>>>  extern const char *usb_state_string(enum usb_device_state state);
>>>
>>> +/**
>>> + * usb_decode_ctrl - Returns human readable representation of control request.
>>> + * @str: buffer to return a human-readable representation of control request.
>>> + *       This buffer should have about 200 bytes.
>>> + * @size: size of str buffer.
>>> + * @bRequestType: matches the USB bmRequestType field
>>> + * @bRequest: matches the USB bRequest field
>>> + * @wValue: matches the USB wValue field (CPU byte order)
>>> + * @wIndex: matches the USB wIndex field (CPU byte order)
>>> + * @wLength: matches the USB wLength field (CPU byte order)
>>> + *
>>> + * Function returns decoded, formatted and human-readable description of
>>> + * control request packet.
>>> + *
>>> + * The usage scenario for this is for tracepoints, so function as a return
>>> + * use the same value as in parameters. This approach allows to use this
>>> + * function in TP_printk
>>> + *
>>> + * Important: wValue, wIndex, wLength parameters before invoking this function
>>> + * should be processed by le16_to_cpu macro.
>>> + */
>>> +extern const char *usb_decode_ctrl(char *str, size_t size, __u8 bRequestType,
>>> +				   __u8 bRequest, __u16 wValue, __u16 wIndex,
>>> +				   __u16 wLength);
>>> +
>>
>> where's the stub when !TRACING?
> 
> Right, I will add 
> #ifdef	CONFIG_TRACING 
> 	.....
> #endif 

Can usb_decode_ctrl() be used even when CONFIG_TRACING is not set?
If yes then above #ifdefe is not sufficient.

You might need to do something like

#if defined(CONFIG_TRACING)

extern const char *usb_decode_ctrl(..)

#else

static inline const char *usb_decode_ctrl(..) {
	return NULL;
}

#endif

--
cheers,
-roger 
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
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