linux-kernel - [PATCH v3 24/36] usb: gadget: f_hid: handle requests lifetime properly

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Date:	Fri, 11 Dec 2015 12:25:03 +0100
From:	Robert Baldyga <r.baldyga@...sung.com>
To:	balbi@...com
Cc:	gregkh@...uxfoundation.org, andrzej.p@...sung.com,
	m.szyprowski@...sung.com, b.zolnierkie@...sung.com,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Robert Baldyga <r.baldyga@...sung.com>
Subject: [PATCH v3 24/36] usb: gadget: f_hid: handle requests lifetime properly

So far USB requests allocated in hidg_set_alt() were not freed. Now we
free them in case of hidg_set_alt() failure (when we are not able to
allocate and enqueue all the requests) or in hidg_disable() function.

Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>
---
 drivers/usb/gadget/function/f_hid.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/function/f_hid.c b/drivers/usb/gadget/function/f_hid.c
index 99285b4..0456a53 100644
--- a/drivers/usb/gadget/function/f_hid.c
+++ b/drivers/usb/gadget/function/f_hid.c
@@ -59,6 +59,7 @@ struct f_hidg {
 	bool				write_pending;
 	wait_queue_head_t		write_queue;
 	struct usb_request		*req;
+	struct usb_request		**out_reqs;
 
 	int				minor;
 	struct cdev			cdev;
@@ -490,6 +491,7 @@ static void hidg_disable(struct usb_function *f)
 {
 	struct f_hidg *hidg = func_to_hidg(f);
 	struct f_hidg_req_list *list, *next;
+	int i;
 
 	usb_ep_disable(hidg->in_ep);
 	usb_ep_disable(hidg->out_ep);
@@ -498,6 +500,12 @@ static void hidg_disable(struct usb_function *f)
 		list_del(&list->list);
 		kfree(list);
 	}
+
+	for (i = 0; i < hidg->qlen; ++i) {
+		kfree(hidg->out_reqs[i]->buf);
+		kfree(hidg->out_reqs[i]);
+	}
+	kfree(hidg->out_reqs);
 }
 
 static int hidg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
@@ -547,11 +555,14 @@ static int hidg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 		/*
 		 * allocate a bunch of read buffers and queue them all at once.
 		 */
+		hidg->out_reqs = kzalloc(hidg->qlen *
+				sizeof(*hidg->out_reqs), GFP_KERNEL);
 		for (i = 0; i < hidg->qlen && status == 0; i++) {
 			struct usb_request *req =
 					hidg_alloc_ep_req(hidg->out_ep,
 							  hidg->report_length);
 			if (req) {
+				hidg->out_reqs[i] = req;
 				req->complete = hidg_set_report_complete;
 				req->context  = hidg;
 				status = usb_ep_queue(hidg->out_ep, req,
@@ -562,11 +573,20 @@ static int hidg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 			} else {
 				usb_ep_disable(hidg->out_ep);
 				status = -ENOMEM;
-				goto fail;
+				goto free_req;
 			}
 		}
 	}
 
+free_req:
+	if (status < 0) {
+		while (i--) {
+			kfree(hidg->out_reqs[i]->buf);
+			kfree(hidg->out_reqs[i]);
+		}
+		kfree(hidg->out_reqs);
+	}
+
 fail:
 	return status;
 }
-- 
1.9.1

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