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

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Date:	Tue, 27 Oct 2015 09:18:14 +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 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.

Make it static it doesn't make sense. This function is exported in the
kernel.

-- 
Felipe
--
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