linux-kernel - Re: [PATCH 1/4] usb: gadget: f_midi: fixed endianness when using wMaxPacketSize

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Message-ID: <CAMz4ku+q8KrUR4fae=R2O3=36w3fp0EEuqAQQE8EXHCaRDXBZg@mail.gmail.com>
Date:	Tue, 26 Jul 2016 09:51:33 +0800
From:	Baolin Wang <baolin.wang@...aro.org>
To:	"Felipe F. Tonello" <eu@...ipetonello.com>
Cc:	USB <linux-usb@...r.kernel.org>, Felipe Balbi <balbi@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] usb: gadget: f_midi: fixed endianness when using wMaxPacketSize

Hi,

On 26 July 2016 at 07:15, Felipe F. Tonello <eu@...ipetonello.com> wrote:
> USB spec specifies wMaxPacketSize to be little endian (as other properties),
> so when using this variable in the driver we should convert to the current
> CPU endianness if necessary.
>
> Signed-off-by: Felipe F. Tonello <eu@...ipetonello.com>
> ---
>  drivers/usb/gadget/function/f_midi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/gadget/function/f_midi.c b/drivers/usb/gadget/function/f_midi.c
> index 58fc199a18ec..a83d852b1da5 100644
> --- a/drivers/usb/gadget/function/f_midi.c
> +++ b/drivers/usb/gadget/function/f_midi.c
> @@ -362,7 +362,7 @@ static int f_midi_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
>                 struct usb_request *req =
>                         midi_alloc_ep_req(midi->out_ep,
>                                 max_t(unsigned, midi->buflen,
> -                                       bulk_out_desc.wMaxPacketSize));
> +                                       le16_to_cpu(bulk_out_desc.wMaxPacketSize)));

I think here we should use usb_ep_align_maybe() function instead of
max_t() to handle 'quirk_ep_out_aligned_size' quirk, please see the
patch I've send out: https://lkml.org/lkml/2016/7/12/106

>                 if (req == NULL)
>                         return -ENOMEM;
>
> --
> 2.9.2
>
> --
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-- 
Baolin.wang
Best Regards