linux-kernel - Re: [PATCH v2 2/5] usb: gadget: midi: avoid redundant f_midi_set

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Date:	Wed, 08 Jul 2015 15:45:43 +0200
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Robert Baldyga <r.baldyga@...sung.com>, gregkh@...uxfoundation.org,
	balbi@...com
Cc:	nicolas.ferre@...el.com, dan.carpenter@...cle.com,
	sergei.shtylyov@...entembedded.com, andrzej.p@...sung.com,
	m.szyprowski@...sung.com, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Robert Baldyga <r.baldyga@...sung.com>
Subject: Re: [PATCH v2 2/5] usb: gadget: midi: avoid redundant f_midi_set_alt() call

On Wed, Jul 08 2015, Robert Baldyga wrote:
> Function midi registers two interfaces with single set_alt() function
> which means that f_midi_set_alt() is called twice when configuration
> is set. That means that endpoint initialization and ep request allocation
> is done two times. To avoid this problem we do such things only once,
> for interface number 1 (MIDI Streaming interface).
>
> Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>

Acked-by: Michal Nazarewicz <mina86@...a86.com>

> ---
>  drivers/usb/gadget/function/f_midi.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/usb/gadget/function/f_midi.c b/drivers/usb/gadget/function/f_midi.c
> index 6316aa5..4cef222 100644
> --- a/drivers/usb/gadget/function/f_midi.c
> +++ b/drivers/usb/gadget/function/f_midi.c
> @@ -329,6 +329,10 @@ static int f_midi_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
>  	unsigned i;
>  	int err;
>  
> +	/* For Control Device interface we do nothing */
> +	if (intf == 0)
> +		return 0;
> +
>  	err = f_midi_start_ep(midi, f, midi->in_ep);
>  	if (err)
>  		return err;
> -- 
> 1.9.1
>

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
ooo +--<mpn@...gle.com>--<xmpp:mina86@...ber.org>--ooO--(_)--Ooo--
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