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

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Message-ID: <8d991a09-4931-ca21-2128-b167719fa605@felipetonello.com>
Date:	Thu, 11 Aug 2016 09:37:45 +0100
From:	Felipe Ferreri Tonello <eu@...ipetonello.com>
To:	Felipe Balbi <balbi@...nel.org>,
	Baolin Wang <baolin.wang@...aro.org>
Cc:	USB <linux-usb@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] usb: gadget: f_midi: fixed endianness when using
 wMaxPacketSize

Hi Balbi,

On 10/08/16 12:24, Felipe Balbi wrote:
> 
> Hi,
> 
> Baolin Wang <baolin.wang@...aro.org> writes:
>> 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
> 
> agree, if usb_ep_align_maybe() has a bug with endianness, let's fix it
> since there are other gadgets using usb_ep_align_maybe()
> 

Can you take a look at v4 of this patchset, please? It's the latest
stuff I have sent.

-- 
Felipe

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