linux-kernel - Re: [PATCH v5 3/7] usb: gadget: define free_ep

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Date:	Fri, 13 Nov 2015 09:11:11 +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>,
	Clemens Ladisch <clemens@...isch.de>
Subject: Re: [PATCH v5 3/7] usb: gadget: define free_ep_req as universal
 function

On 11/10/2015 06:52 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>

Reviewed-by: Robert Baldyga <r.baldyga@...sung.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                   |  1 -
>  drivers/usb/gadget/u_f.h                   | 10 ++++++++--
>  5 files changed, 8 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/usb/gadget/function/f_midi.c b/drivers/usb/gadget/function/f_midi.c
> index 488111d..f36db2d 100644
> --- a/drivers/usb/gadget/function/f_midi.c
> +++ b/drivers/usb/gadget/function/f_midi.c
> @@ -201,12 +201,6 @@ 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 d7646d3..74f95b1 100644
> --- a/drivers/usb/gadget/function/f_sourcesink.c
> +++ b/drivers/usb/gadget/function/f_sourcesink.c
> @@ -303,12 +303,6 @@ static inline struct usb_request *ss_alloc_ep_req(struct usb_ep *ep, int len)
>  	return alloc_ep_req(ep, len, ss->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..4bc7eea 100644
> --- a/drivers/usb/gadget/u_f.c
> +++ b/drivers/usb/gadget/u_f.c
> @@ -11,7 +11,6 @@
>   * published by the Free Software Foundation.
>   */
>  
> -#include <linux/usb/gadget.h>
>  #include "u_f.h"
>  
>  struct usb_request *alloc_ep_req(struct usb_ep *ep, int len, int default_len)
> diff --git a/drivers/usb/gadget/u_f.h b/drivers/usb/gadget/u_f.h
> index 1d5f0eb..4247cc0 100644
> --- a/drivers/usb/gadget/u_f.h
> +++ b/drivers/usb/gadget/u_f.h
> @@ -16,6 +16,8 @@
>  #ifndef __U_F_H__
>  #define __U_F_H__
>  
> +#include <linux/usb/gadget.h>
> +
>  /* Variable Length Array Macros **********************************************/
>  #define vla_group(groupname) size_t groupname##__next = 0
>  #define vla_group_size(groupname) groupname##__next
> @@ -45,8 +47,12 @@
>  struct usb_ep;
>  struct usb_request;
>  
> +/* 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);
> +static inline void free_ep_req(struct usb_ep *ep, struct usb_request *req)
> +{
> +	kfree(req->buf);
> +	usb_ep_free_request(ep, req);
> +}
>  
>  #endif /* __U_F_H__ */
> -
> -
> 

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