[PATCH 4/4] staging: vt6656: use usb_anchor for tx queue.

[Malcolm Priestley <tvboxspy@xxxxxxxxx>]

Use usb_anchor to track tx submitted urbs and initialize the
urb as needed in vnt_tx_context.

Signed-off-by: Malcolm Priestley <tvboxspy@xxxxxxxxx>
---
 drivers/staging/vt6656/device.h   |  2 +-
 drivers/staging/vt6656/main_usb.c | 18 ++++--------------
 drivers/staging/vt6656/usbpipe.c  | 14 ++++++++++++--
 3 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/drivers/staging/vt6656/device.h b/drivers/staging/vt6656/device.h
index 08294b21c4e9..d1b19dcaf991 100644
--- a/drivers/staging/vt6656/device.h
+++ b/drivers/staging/vt6656/device.h
@@ -238,7 +238,6 @@ struct vnt_rcb {
 struct vnt_usb_send_context {
 	void *priv;
 	struct sk_buff *skb;
-	struct urb *urb;
 	struct ieee80211_hdr *hdr;
 	void *tx_buffer;
 	unsigned int buf_len;
@@ -292,6 +291,7 @@ struct vnt_private {
 
 	/* Variables to track resources for the BULK Out Pipe */
 	struct vnt_usb_send_context *tx_context[CB_MAX_TX_DESC];
+	struct usb_anchor tx_submitted;
 	u32 num_tx_context;
 
 	/* Variables to track resources for the Interrupt In Pipe */
diff --git a/drivers/staging/vt6656/main_usb.c b/drivers/staging/vt6656/main_usb.c
index 930ee424ecdf..c0169e32621b 100644
--- a/drivers/staging/vt6656/main_usb.c
+++ b/drivers/staging/vt6656/main_usb.c
@@ -445,17 +445,13 @@ static void vnt_free_tx_bufs(struct vnt_private *priv)
 	struct vnt_usb_send_context *tx_context;
 	int ii;
 
+	usb_kill_anchored_urbs(&priv->tx_submitted);
+
 	for (ii = 0; ii < priv->num_tx_context; ii++) {
 		tx_context = priv->tx_context[ii];
 		if (!tx_context)
 			continue;
 
-		/* deallocate URBs */
-		if (tx_context->urb) {
-			usb_kill_urb(tx_context->urb);
-			usb_free_urb(tx_context->urb);
-		}
-
 		kfree(tx_context);
 	}
 }
@@ -496,6 +492,8 @@ static int vnt_alloc_bufs(struct vnt_private *priv)
 	struct vnt_rcb *rcb;
 	int ii;
 
+	init_usb_anchor(&priv->tx_submitted);
+
 	for (ii = 0; ii < priv->num_tx_context; ii++) {
 		tx_context = kmalloc(sizeof(*tx_context), GFP_KERNEL);
 		if (!tx_context) {
@@ -506,14 +504,6 @@ static int vnt_alloc_bufs(struct vnt_private *priv)
 		priv->tx_context[ii] = tx_context;
 		tx_context->priv = priv;
 		tx_context->pkt_no = ii;
-
-		/* allocate URBs */
-		tx_context->urb = usb_alloc_urb(0, GFP_KERNEL);
-		if (!tx_context->urb) {
-			ret = -ENOMEM;
-			goto free_tx;
-		}
-
 		tx_context->in_use = false;
 	}
 
diff --git a/drivers/staging/vt6656/usbpipe.c b/drivers/staging/vt6656/usbpipe.c
index 43f1ef32a9ce..2164f45e13ab 100644
--- a/drivers/staging/vt6656/usbpipe.c
+++ b/drivers/staging/vt6656/usbpipe.c
@@ -456,7 +456,7 @@ int vnt_tx_context(struct vnt_private *priv,
 		   struct vnt_usb_send_context *context)
 {
 	int status;
-	struct urb *urb = context->urb;
+	struct urb *urb;
 
 	if (test_bit(DEVICE_FLAGS_DISCONNECTED, &priv->flags)) {
 		context->in_use = false;
@@ -468,6 +468,12 @@ int vnt_tx_context(struct vnt_private *priv,
 		return -E2BIG;
 	}
 
+	urb = usb_alloc_urb(0, GFP_ATOMIC);
+	if (!urb) {
+		context->in_use = false;
+		return -ENOMEM;
+	}
+
 	usb_fill_bulk_urb(urb,
 			  priv->usb,
 			  usb_sndbulkpipe(priv->usb, 3),
@@ -476,12 +482,16 @@ int vnt_tx_context(struct vnt_private *priv,
 			  vnt_tx_context_complete,
 			  context);
 
+	usb_anchor_urb(urb, &priv->tx_submitted);
+
 	status = usb_submit_urb(urb, GFP_ATOMIC);
 	if (status) {
 		dev_dbg(&priv->usb->dev, "Submit Tx URB failed %d\n", status);
-
+		usb_unanchor_urb(urb);
 		context->in_use = false;
 	}
 
+	usb_free_urb(urb);
+
 	return status;
 }
-- 
2.25.1