linux-kernel - Re: [PATCH v5 1/3] usb: gadget: Refactor request completion

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Date:	Wed, 17 Sep 2014 10:28:01 -0500
From:	Felipe Balbi <balbi@...com>
To:	Michal Sojka <sojka@...ica.cz>
CC:	<linux-usb@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Bryan Wu <cooloney@...il.com>, Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux LED Subsystem <linux-leds@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <michal.vokac@...ap.cz>
Subject: Re: [PATCH v5 1/3] usb: gadget: Refactor request completion

On Wed, Sep 17, 2014 at 09:21:11AM +0200, Michal Sojka wrote:
> All USB peripheral controller drivers called completion routines
> directly. This patch moves the completion call from drivers to
> usb_gadget_giveback_request(), in order to have a place where common
> functionality can be added.
> 
> All places in drivers/usb/ matching "[-.]complete(" were replaced with a
> call to usb_gadget_giveback_request(). This was compile-tested with all
> ARM drivers enabled and runtime-tested for musb.
> 
> Signed-off-by: Michal Sojka <sojka@...ica.cz>
> ---
>  drivers/usb/chipidea/udc.c              |  6 +++---
>  drivers/usb/dwc2/gadget.c               |  6 +++---
>  drivers/usb/dwc3/gadget.c               |  2 +-
>  drivers/usb/gadget/udc/amd5536udc.c     |  2 +-
>  drivers/usb/gadget/udc/at91_udc.c       |  2 +-
>  drivers/usb/gadget/udc/atmel_usba_udc.c |  4 ++--
>  drivers/usb/gadget/udc/bcm63xx_udc.c    |  2 +-
>  drivers/usb/gadget/udc/dummy_hcd.c      | 10 +++++-----
>  drivers/usb/gadget/udc/fotg210-udc.c    |  2 +-
>  drivers/usb/gadget/udc/fsl_qe_udc.c     |  6 +-----
>  drivers/usb/gadget/udc/fsl_udc_core.c   |  6 ++----
>  drivers/usb/gadget/udc/fusb300_udc.c    |  2 +-
>  drivers/usb/gadget/udc/goku_udc.c       |  2 +-
>  drivers/usb/gadget/udc/gr_udc.c         |  2 +-
>  drivers/usb/gadget/udc/lpc32xx_udc.c    |  2 +-
>  drivers/usb/gadget/udc/m66592-udc.c     |  2 +-
>  drivers/usb/gadget/udc/mv_u3d_core.c    |  8 ++------
>  drivers/usb/gadget/udc/mv_udc_core.c    |  8 ++------
>  drivers/usb/gadget/udc/net2272.c        |  2 +-
>  drivers/usb/gadget/udc/net2280.c        |  2 +-
>  drivers/usb/gadget/udc/omap_udc.c       |  2 +-
>  drivers/usb/gadget/udc/pch_udc.c        |  2 +-
>  drivers/usb/gadget/udc/pxa25x_udc.c     |  2 +-
>  drivers/usb/gadget/udc/pxa27x_udc.c     |  2 +-
>  drivers/usb/gadget/udc/r8a66597-udc.c   |  2 +-
>  drivers/usb/gadget/udc/s3c-hsudc.c      |  3 +--
>  drivers/usb/gadget/udc/s3c2410_udc.c    |  2 +-
>  drivers/usb/gadget/udc/udc-core.c       | 19 +++++++++++++++++++
>  drivers/usb/musb/musb_gadget.c          |  2 +-
>  drivers/usb/renesas_usbhs/mod_gadget.c  |  2 +-
>  include/linux/usb/gadget.h              |  8 ++++++++

I would rather split this into several patches, btw. With the
introduction of usb_gadget_giveback_request() being the first one in the
series. It's easier to review that way.

> diff --git a/drivers/usb/gadget/udc/udc-core.c b/drivers/usb/gadget/udc/udc-core.c
> index b0d9817..29789f1 100644
> --- a/drivers/usb/gadget/udc/udc-core.c
> +++ b/drivers/usb/gadget/udc/udc-core.c
> @@ -106,6 +106,25 @@ EXPORT_SYMBOL_GPL(usb_gadget_unmap_request);
>  
>  /* ------------------------------------------------------------------------- */
>  
> +/**
> + * usb_gadget_giveback_request - give the request back to the gadget layer
> + * Context: in_interrupt()
> + *
> + * This is called by device controller drivers in order to return the
> + * completed request back to the gadget layer.
> + */
> +void usb_gadget_giveback_request(struct usb_ep *ep,
> +		struct usb_request *req)
> +{
> +	if (likely(req->complete))
> +		req->complete(ep, req);
> +	else
> +		pr_err("%s : req->complete must not be NULL\n", __func__);

let it Oops. We require ->complete to be valid, if there's any gadget
driver not setting ->complete, it deserves to oops so we can the error.

-- 
balbi

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