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

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Date:	Tue, 27 Oct 2015 12:53:51 +0000
From:	Felipe Ferreri Tonello <eu@...ipetonello.com>
To:	Robert Baldyga <r.baldyga@...sung.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

Hi Robert,

On 27/10/15 09:47, Robert Baldyga wrote:
> On 10/27/2015 10:18 AM, Felipe Ferreri Tonello wrote:
>> Hi Robert,
>>
>> On 27/10/15 06:53, Robert Baldyga wrote:
>>> 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?
>>
>> inline yes. And the compiler will do it automatically. But I can add it
>> for clarity.
> 
> No, compiler will never make function inline when you export its symbol.
> To make it inline you should place it in header.

Correct.

I will improve it on next revision.

-- 
Felipe
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