linux-kernel - Re: [PATCH v4 08/10] usb: gadget: remove useless parameter in alloc_ep

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Date:   Tue, 23 Aug 2016 14:01:01 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Felipe Ferreri Tonello <eu@...ipetonello.com>,
        linux-usb@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Michal Nazarewicz <mina86@...a86.com>
Subject: Re: [PATCH v4 08/10] usb: gadget: remove useless parameter in alloc_ep_req()


Hi,

Felipe Ferreri Tonello <eu@...ipetonello.com> writes:
>> "Felipe F. Tonello" <eu@...ipetonello.com> writes:
>>> The default_length parameter of alloc_ep_req was not really necessary
>>> and gadget drivers would almost always create an inline function to pass
>>> the same value to len and default_len.
>>>
>>> So this patch also removes duplicate code from few drivers.
>>>
>>> Signed-off-by: Felipe F. Tonello <eu@...ipetonello.com>
>>> ---
>>>  drivers/usb/gadget/function/f_hid.c        | 10 ++--------
>>>  drivers/usb/gadget/function/f_loopback.c   |  9 +--------
>>>  drivers/usb/gadget/function/f_midi.c       | 10 ++--------
>>>  drivers/usb/gadget/function/f_sourcesink.c | 11 ++---------
>>>  drivers/usb/gadget/u_f.c                   |  7 +++----
>>>  drivers/usb/gadget/u_f.h                   |  3 +--
>>>  6 files changed, 11 insertions(+), 39 deletions(-)
>>>
>>> diff --git a/drivers/usb/gadget/function/f_hid.c b/drivers/usb/gadget/function/f_hid.c
>>> index 51980c50546d..e82a7468252e 100644
>>> --- a/drivers/usb/gadget/function/f_hid.c
>>> +++ b/drivers/usb/gadget/function/f_hid.c
>>> @@ -362,12 +362,6 @@ static int f_hidg_open(struct inode *inode, struct file *fd)
>>>  /*-------------------------------------------------------------------------*/
>>>  /*                                usb_function                             */
>>>  
>>> -static inline struct usb_request *hidg_alloc_ep_req(struct usb_ep *ep,
>>> -						    unsigned length)
>>> -{
>>> -	return alloc_ep_req(ep, length, length);
>>> -}
>> 
>> actually, I prefer to keep these little helpers. I was recently playing
>> with adding SG list support to g_zero (I should have patches soon) and
>> it was actually very nice to have the sourcesink helper as I could just
>> ditch alloc_ep_req(). The change to the driver was local to
>> ss_alloc_ep_req() and nothing else changed :-)
>> 
>
> Right, but then it is worth to have the helper function. In this
> particular case, I am removing a useless helper functions, especially
> that the previous patch removes the need for the optional parameter in
> alloc_ep_req.

it's a static inline :-) It won't do any bad to keep it. And, as I said,
if we want to ditch aloc_ep_req() eventually, then we have just one
place to patch ;-)

-- 
balbi

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