linux-kernel - [PATCH 2/2] usb: gadget: f_loopfack: fix function params handling

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Date:	Thu, 24 Sep 2015 17:02:47 +0200
From:	Robert Baldyga <r.baldyga@...sung.com>
To:	balbi@...com
Cc:	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, andrzej.p@...sung.com,
	b.zolnierkie@...sung.com, Robert Baldyga <r.baldyga@...sung.com>
Subject: [PATCH 2/2] usb: gadget: f_loopfack: fix function params handling

Move function parameters to struct f_loopback to make them per instance
instead of having them as global variables. Since we can have multiple
instances of USB function we also want to have separate set of parameters
for each instance.

Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>
---
 drivers/usb/gadget/function/f_loopback.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/usb/gadget/function/f_loopback.c b/drivers/usb/gadget/function/f_loopback.c
index 300e601..8d2dac8 100644
--- a/drivers/usb/gadget/function/f_loopback.c
+++ b/drivers/usb/gadget/function/f_loopback.c
@@ -34,6 +34,9 @@ struct f_loopback {
 
 	struct usb_ep		*in_ep;
 	struct usb_ep		*out_ep;
+
+	unsigned qlen;
+	unsigned buflen;
 };
 
 static inline struct f_loopback *func_to_loop(struct usb_function *f)
@@ -41,9 +44,6 @@ static inline struct f_loopback *func_to_loop(struct usb_function *f)
 	return container_of(f, struct f_loopback, function);
 }
 
-static unsigned qlen;
-static unsigned buflen;
-
 /*-------------------------------------------------------------------------*/
 
 static struct usb_interface_descriptor loopback_intf = {
@@ -251,7 +251,7 @@ static void loopback_complete(struct usb_ep *ep, struct usb_request *req)
 		}
 
 		/* queue the buffer for some later OUT packet */
-		req->length = buflen;
+		req->length = loop->buflen;
 		status = usb_ep_queue(ep, req, GFP_ATOMIC);
 		if (status == 0)
 			return;
@@ -288,7 +288,9 @@ static void disable_loopback(struct f_loopback *loop)
 
 static inline struct usb_request *lb_alloc_ep_req(struct usb_ep *ep, int len)
 {
-	return alloc_ep_req(ep, len, buflen);
+	struct f_loopback	*loop = ep->driver_data;
+
+	return alloc_ep_req(ep, len, loop->buflen);
 }
 
 static int enable_endpoint(struct usb_composite_dev *cdev, struct f_loopback *loop,
@@ -315,7 +317,7 @@ static int enable_endpoint(struct usb_composite_dev *cdev, struct f_loopback *lo
 	 * we buffer at most 'qlen' transfers; fewer if any need more
 	 * than 'buflen' bytes each.
 	 */
-	for (i = 0; i < qlen && result == 0; i++) {
+	for (i = 0; i < loop->qlen && result == 0; i++) {
 		req = lb_alloc_ep_req(ep, 0);
 		if (!req)
 			goto fail1;
@@ -388,10 +390,10 @@ static struct usb_function *loopback_alloc(struct usb_function_instance *fi)
 	lb_opts->refcnt++;
 	mutex_unlock(&lb_opts->lock);
 
-	buflen = lb_opts->bulk_buflen;
-	qlen = lb_opts->qlen;
-	if (!qlen)
-		qlen = 32;
+	loop->buflen = lb_opts->bulk_buflen;
+	loop->qlen = lb_opts->qlen;
+	if (!loop->qlen)
+		loop->qlen = 32;
 
 	loop->function.name = "loopback";
 	loop->function.bind = loopback_bind;
-- 
1.9.1

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