linux-kernel - Re: [PATCH v4 3/7] usb: gadget: define free_ep

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Date:	Tue, 27 Oct 2015 07:53:50 +0100
From:	Robert Baldyga <r.baldyga@...sung.com>
To:	"Felipe F. Tonello" <eu@...ipetonello.com>,
	linux-usb@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrzej Pietrasiewicz <andrzej.p@...sung.com>,
	Clemens Ladisch <clemens@...isch.de>
Subject: Re: [PATCH v4 3/7] usb: gadget: define free_ep_req as universal
 function

On 10/26/2015 05:55 PM, Felipe F. Tonello wrote:
> This function is shared between gadget functions, so this avoid unnecessary
> duplicated code and potentially avoid memory leaks.
> 
> Signed-off-by: Felipe F. Tonello <eu@...ipetonello.com>
> ---
>  drivers/usb/gadget/function/f_midi.c       | 6 ------
>  drivers/usb/gadget/function/f_sourcesink.c | 6 ------
>  drivers/usb/gadget/function/g_zero.h       | 1 -
>  drivers/usb/gadget/u_f.c                   | 8 ++++++++
>  drivers/usb/gadget/u_f.h                   | 3 +--
>  5 files changed, 9 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/usb/gadget/function/f_midi.c b/drivers/usb/gadget/function/f_midi.c
> index c19f154..4c01c8a 100644
> --- a/drivers/usb/gadget/function/f_midi.c
> +++ b/drivers/usb/gadget/function/f_midi.c
> @@ -202,12 +202,6 @@ static inline struct usb_request *midi_alloc_ep_req(struct usb_ep *ep,
>  	return alloc_ep_req(ep, length, length);
>  }
>  
> -static void free_ep_req(struct usb_ep *ep, struct usb_request *req)
> -{
> -	kfree(req->buf);
> -	usb_ep_free_request(ep, req);
> -}
> -
>  static const uint8_t f_midi_cin_length[] = {
>  	0, 0, 2, 3, 3, 1, 2, 3, 3, 3, 3, 3, 2, 2, 3, 1
>  };
> diff --git a/drivers/usb/gadget/function/f_sourcesink.c b/drivers/usb/gadget/function/f_sourcesink.c
> index 3a5ae99..eedea7f 100644
> --- a/drivers/usb/gadget/function/f_sourcesink.c
> +++ b/drivers/usb/gadget/function/f_sourcesink.c
> @@ -307,12 +307,6 @@ static inline struct usb_request *ss_alloc_ep_req(struct usb_ep *ep, int len)
>  	return alloc_ep_req(ep, len, buflen);
>  }
>  
> -void free_ep_req(struct usb_ep *ep, struct usb_request *req)
> -{
> -	kfree(req->buf);
> -	usb_ep_free_request(ep, req);
> -}
> -
>  static void disable_ep(struct usb_composite_dev *cdev, struct usb_ep *ep)
>  {
>  	int			value;
> diff --git a/drivers/usb/gadget/function/g_zero.h b/drivers/usb/gadget/function/g_zero.h
> index 15f1809..5ed90b4 100644
> --- a/drivers/usb/gadget/function/g_zero.h
> +++ b/drivers/usb/gadget/function/g_zero.h
> @@ -59,7 +59,6 @@ void lb_modexit(void);
>  int lb_modinit(void);
>  
>  /* common utilities */
> -void free_ep_req(struct usb_ep *ep, struct usb_request *req);
>  void disable_endpoints(struct usb_composite_dev *cdev,
>  		struct usb_ep *in, struct usb_ep *out,
>  		struct usb_ep *iso_in, struct usb_ep *iso_out);
> diff --git a/drivers/usb/gadget/u_f.c b/drivers/usb/gadget/u_f.c
> index c6276f0..f78bd1f 100644
> --- a/drivers/usb/gadget/u_f.c
> +++ b/drivers/usb/gadget/u_f.c
> @@ -14,6 +14,7 @@
>  #include <linux/usb/gadget.h>
>  #include "u_f.h"
>  
> +/* Requests allocated via alloc_ep_req() must be freed by free_ep_req(). */
>  struct usb_request *alloc_ep_req(struct usb_ep *ep, int len, int default_len)
>  {
>  	struct usb_request      *req;
> @@ -30,3 +31,10 @@ struct usb_request *alloc_ep_req(struct usb_ep *ep, int len, int default_len)
>  	return req;
>  }
>  EXPORT_SYMBOL_GPL(alloc_ep_req);
> +
> +void free_ep_req(struct usb_ep *ep, struct usb_request *req)
> +{
> +	kfree(req->buf);
> +	usb_ep_free_request(ep, req);
> +}
> +EXPORT_SYMBOL_GPL(free_ep_req);
> diff --git a/drivers/usb/gadget/u_f.h b/drivers/usb/gadget/u_f.h
> index 1d5f0eb..2a1a6fb 100644
> --- a/drivers/usb/gadget/u_f.h
> +++ b/drivers/usb/gadget/u_f.h
> @@ -46,7 +46,6 @@ struct usb_ep;
>  struct usb_request;
>  
>  struct usb_request *alloc_ep_req(struct usb_ep *ep, int len, int default_len);
> +void free_ep_req(struct usb_ep *ep, struct usb_request *req);
>  
>  #endif /* __U_F_H__ */
> -
> -
> 

Isn't it simple enough to be static inline?

Best regards,
Robert
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