[PATCH v4 3/7] usb: gadget: define free_ep_req as universal function

["Felipe F. Tonello" <eu@felipetonello.com>]

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@felipetonello.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__ */
-
-
-- 
2.1.4