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

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Message-ID: <87oa4q5z4q.fsf@linux.intel.com>
Date:	Thu, 18 Aug 2016 10:12:37 +0300
From:	Felipe Balbi <balbi@...nel.org>
To:	"Felipe F. 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 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 :-)

-- 
balbi

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