[PATCH 3.16 067/212] usb: gadget: f_hid: fix: Free out requests

[Ben Hutchings]

3.16.44-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Krzysztof Opasiak <kopasiak90@xxxxxxxxx>

commit 20d2ca955bd09639c7b01db5761d157c297aea0a upstream.

Requests for out endpoint are allocated in bind() function
but never released.

This commit ensures that all pending requests are released
when we disable out endpoint.

Fixes: 99c515005857 ("usb: gadget: hidg: register OUT INT endpoint for SET_REPORT")
Tested-by: David Lechner <david@xxxxxxxxxxxxxx>
Signed-off-by: Krzysztof Opasiak <k.opasiak@xxxxxxxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
[bwh: Backported to 3.16: adjust filename]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 drivers/usb/gadget/f_hid.c | 32 ++++++++++++++++++++++++--------
 1 file changed, 24 insertions(+), 8 deletions(-)

--- a/drivers/usb/gadget/f_hid.c
+++ b/drivers/usb/gadget/f_hid.c
@@ -345,20 +345,36 @@ static inline struct usb_request *hidg_a
 static void hidg_set_report_complete(struct usb_ep *ep, struct usb_request *req)
 {
 	struct f_hidg *hidg = (struct f_hidg *) req->context;
+	struct usb_composite_dev *cdev = hidg->func.config->cdev;
 	struct f_hidg_req_list *req_list;
 	unsigned long flags;
 
-	req_list = kzalloc(sizeof(*req_list), GFP_ATOMIC);
-	if (!req_list)
-		return;
+	switch (req->status) {
+	case 0:
+		req_list = kzalloc(sizeof(*req_list), GFP_ATOMIC);
+		if (!req_list) {
+			ERROR(cdev, "Unable to allocate mem for req_list\n");
+			goto free_req;
+		}
 
-	req_list->req = req;
+		req_list->req = req;
 
-	spin_lock_irqsave(&hidg->spinlock, flags);
-	list_add_tail(&req_list->list, &hidg->completed_out_req);
-	spin_unlock_irqrestore(&hidg->spinlock, flags);
+		spin_lock_irqsave(&hidg->spinlock, flags);
+		list_add_tail(&req_list->list, &hidg->completed_out_req);
+		spin_unlock_irqrestore(&hidg->spinlock, flags);
 
-	wake_up(&hidg->read_queue);
+		wake_up(&hidg->read_queue);
+		break;
+	default:
+		ERROR(cdev, "Set report failed %d\n", req->status);
+		/* FALLTHROUGH */
+	case -ECONNABORTED:		/* hardware forced ep reset */
+	case -ECONNRESET:		/* request dequeued */
+	case -ESHUTDOWN:		/* disconnect from host */
+free_req:
+		free_ep_req(ep, req);
+		return;
+	}
 }
 
 static int hidg_setup(struct usb_function *f,