linux-kernel - Re: [PATCH v6 4/8] usb: gadget: move find

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Date:	Wed, 5 Aug 2015 10:30:54 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Robert Baldyga <r.baldyga@...sung.com>
cc:	balbi@...com, <gregkh@...uxfoundation.org>,
	<linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v6 4/8] usb: gadget: move find_ep() from epautoconf to
 gadget.h

On Wed, 5 Aug 2015, Robert Baldyga wrote:

> Move find_ep() function to gadget.h, rename it to gadget_find_ep_by_name()
> and make it static inline. It can be used in UDC drivers, especially in
> 'match_ep' callback after moving chip-specific endpoint matching logic from
> epautoconf to UDC drivers.

> --- a/include/linux/usb/gadget.h
> +++ b/include/linux/usb/gadget.h
> @@ -639,6 +639,24 @@ static inline struct usb_gadget *dev_to_usb_gadget(struct device *dev)
>  #define gadget_for_each_ep(tmp, gadget) \
>  	list_for_each_entry(tmp, &(gadget)->ep_list, ep_list)
>  
> +/**
> + * gadget_find_ep_by_name - returns ep whose name is the same as sting passed
> + *	in second parameter or NULL if searched endpoint not found
> + * @g: controller to check for quirk
> + * @name: name of searched endpoint
> + */
> +static inline struct usb_ep *
> +gadget_find_ep_by_name(struct usb_gadget *g, const char *name)
> +{
> +	struct usb_ep *ep;
> +
> +	gadget_for_each_ep(ep, g) {
> +		if (!strcmp(ep->name, name))
> +			return ep;
> +	}
> +
> +	return NULL;
> +}

Minor point: Is this function short enough to be worth inlining?  My 
general feeling has been that anything containing a nontrivial loop 
probably shouldn't be inlined, but I could be wrong.

Alan Stern

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