linux-kernel - Re: [PATCH v5 2/5] usb: gadget: add quirk_ep_out_aligned_size field to struct usb

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Date:	Fri, 06 Dec 2013 12:14:56 -0800
From:	David Cohen <david.a.cohen@...ux.intel.com>
To:	balbi@...com
CC:	Michal Nazarewicz <mina86@...a86.com>, gregkh@...uxfoundation.org,
	stern@...land.harvard.edu, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/5] usb: gadget: add quirk_ep_out_aligned_size field
 to struct usb_gadget

On 12/06/2013 12:13 PM, Felipe Balbi wrote:
> On Tue, Nov 12, 2013 at 01:54:28PM +0100, Michal Nazarewicz wrote:
>> On Tue, Nov 12 2013, David Cohen wrote:
>>> On 11/11/2013 03:55 PM, Michal Nazarewicz wrote:
>>>> Come to think of it, perhaps even better helper would be:
>>>>
>>>> static inline size_t usb_ep_align_maybe(
>>>> 	struct usb_gadget *gadget, struct usb_ep *ep, size_t len) {
>>>> 	return gadget->quir_ep_out_aligned_size ?
>>>> 		round_up(len, (size_t)ep->desc->wMaxPacketSize) : len;
>>>> }
>>>
>>> The CPU time to check unsigned:1 and possibly jump is about the same as
>>> round_up() itself. For readability matters, we can round_up() directly.
>>
>> I was proposing to have this function and than not have functions check
>> for the flag.  I.e. instead of
>>
>> 	if (gadget->quirk_ep_out_aligned_size)
>> 		len = usb_ep_align_maxpacketsize(ep, len);
>>
>> the code would just be:
>>
>> 	len = usb_ep_align_maybe(gadget, ep, len);
> 
> that looks very good to me, do we have a version with that already ?

Nope. But as soon as soon as you finish the whole review, I can resend
new version with all changes at once.

Br, David
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