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

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Date:   Tue, 23 Aug 2016 11:18:25 +0100
From:   Felipe Ferreri Tonello <eu@...ipetonello.com>
To:     Felipe Balbi <balbi@...nel.org>, 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 Blabi,

On 18/08/16 08:12, Felipe Balbi wrote:
> 
> Hi,
> 
> "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.

-- 
Felipe

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