NFC: pn533: Simplify __pn533_send_frame_async

In all cases (send_cmd_async, send_data_async and send_sync)
pn533_send_async_complete() handles all responses internally,
so there is no need to pass this as a callback.

Cmd context is passed to __pn533_send_frame_async in all the
cases as well. It's already kept in struct pn533 which is
available all the time the device is attached. So we can make
use of it instead.

Therefore, cmd_complete and cmd_complete_arg are no needed any more.
Signed-off-by: Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/nfc/pn533.c

@@ -330,8 +330,6 @@ struct pn533 {
 	int wq_in_error;
 	int cancel_listen;
 
-	pn533_cmd_complete_t cmd_complete;
-	void *cmd_complete_arg;
 	void *cmd_complete_mi_arg;
 	struct mutex cmd_lock;
 	struct pn533_cmd *cmd;
@@ -506,13 +504,14 @@ static bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame)
 				PN533_CMD_RESPONSE(dev->cmd->code));
 }
 
+static int pn533_send_async_complete(struct pn533 *dev);
 
 static void pn533_wq_cmd_complete(struct work_struct *work)
 {
 	struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
 	int rc;
 
-	rc = dev->cmd_complete(dev, dev->cmd_complete_arg, dev->wq_in_error);
+	rc = pn533_send_async_complete(dev);
 	if (rc != -EINPROGRESS)
 		queue_work(dev->wq, &dev->cmd_work);
 }
@@ -643,15 +642,10 @@ static int pn533_send_ack(struct pn533 *dev, gfp_t flags)
 static int __pn533_send_frame_async(struct pn533 *dev,
 					struct sk_buff *out,
 					struct sk_buff *in,
-					int in_len,
-					pn533_cmd_complete_t cmd_complete,
-					void *arg)
+					int in_len)
 {
 	int rc;
 
-	dev->cmd_complete = cmd_complete;
-	dev->cmd_complete_arg = arg;
-
 	dev->out_urb->transfer_buffer = out->data;
 	dev->out_urb->transfer_buffer_length = out->len;
 
@@ -692,9 +686,10 @@ static void pn533_build_cmd_frame(struct pn533 *dev, u8 cmd_code,
 	ops->tx_frame_finish(skb->data);
 }
 
-static int pn533_send_async_complete(struct pn533 *dev, void *arg, int status)
+static int pn533_send_async_complete(struct pn533 *dev)
 {
-	struct pn533_cmd *cmd = arg;
+	struct pn533_cmd *cmd = dev->cmd;
+	int status = dev->wq_in_error;
 
 	struct sk_buff *req = cmd->req;
 	struct sk_buff *resp = cmd->resp;
@@ -749,8 +744,7 @@ static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
 	mutex_lock(&dev->cmd_lock);
 
 	if (!dev->cmd_pending) {
-		rc = __pn533_send_frame_async(dev, req, resp, resp_len,
-					      pn533_send_async_complete, cmd);
+		rc = __pn533_send_frame_async(dev, req, resp, resp_len);
 		if (rc)
 			goto error;
 
@@ -859,8 +853,7 @@ static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
 
 	pn533_build_cmd_frame(dev, cmd_code, req);
 
-	rc = __pn533_send_frame_async(dev, req, resp, resp_len,
-				      pn533_send_async_complete, cmd);
+	rc = __pn533_send_frame_async(dev, req, resp, resp_len);
 	if (rc < 0) {
 		dev_kfree_skb(resp);
 		kfree(cmd);
@@ -891,8 +884,7 @@ static void pn533_wq_cmd(struct work_struct *work)
 
 	mutex_unlock(&dev->cmd_lock);
 
-	rc = __pn533_send_frame_async(dev, cmd->req, cmd->resp, cmd->resp_len,
-				      pn533_send_async_complete, cmd);
+	rc = __pn533_send_frame_async(dev, cmd->req, cmd->resp, cmd->resp_len);
 	if (rc < 0) {
 		dev_kfree_skb(cmd->req);
 		dev_kfree_skb(cmd->resp);