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

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Message-ID: <20131206201337.GD3889@saruman.home>
Date:	Fri, 6 Dec 2013 14:13:37 -0600
From:	Felipe Balbi <balbi@...com>
To:	Michal Nazarewicz <mina86@...a86.com>
CC:	David Cohen <david.a.cohen@...ux.intel.com>, <balbi@...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 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 ?

-- 
balbi

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