staging: usbip: vhci: give back URBs from in-flight unlink requests

commit b92a5e23737172c52656a090977408a80d7f06d1 upstream.

If we never received a RET_UNLINK because the TCP
connection broke the pending URBs still need to be
unlinked and given back.

Previously processes would be stuck trying to kill
the URB even after the device was detached.

Signed-off-by: Max Vozeler <max@vozeler.com>
Tested-by: Mark Wehby <MWehby@luxotticaRetail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 35 insertions, 7 deletions

diff --git a/drivers/staging/usbip/vhci.h b/drivers/staging/usbip/vhci.h
index 5e375173bbce..ad3a19dac545 100644
--- a/drivers/staging/usbip/vhci.h
+++ b/drivers/staging/usbip/vhci.h
@@ -119,6 +119,9 @@ void rh_port_disconnect(int rhport);
 void vhci_rx_loop(struct usbip_task *ut);
 void vhci_tx_loop(struct usbip_task *ut);
 
+struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev,
+					    __u32 seqnum);
+
 #define hardware		(&the_controller->pdev.dev)
 
 static inline struct vhci_device *port_to_vdev(__u32 port)
diff --git a/drivers/staging/usbip/vhci_hcd.c b/drivers/staging/usbip/vhci_hcd.c
index b50b12abf6f3..253a404253e7 100644
--- a/drivers/staging/usbip/vhci_hcd.c
+++ b/drivers/staging/usbip/vhci_hcd.c
@@ -821,7 +821,6 @@ static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 	return 0;
 }
 
-
 static void vhci_device_unlink_cleanup(struct vhci_device *vdev)
 {
 	struct vhci_unlink *unlink, *tmp;
@@ -829,11 +828,34 @@ static void vhci_device_unlink_cleanup(struct vhci_device *vdev)
 	spin_lock(&vdev->priv_lock);
 
 	list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
+		usbip_uinfo("unlink cleanup tx %lu\n", unlink->unlink_seqnum);
 		list_del(&unlink->list);
 		kfree(unlink);
 	}
 
 	list_for_each_entry_safe(unlink, tmp, &vdev->unlink_rx, list) {
+		struct urb *urb;
+
+		/* give back URB of unanswered unlink request */
+		usbip_uinfo("unlink cleanup rx %lu\n", unlink->unlink_seqnum);
+
+		urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
+		if (!urb) {
+			usbip_uinfo("the urb (seqnum %lu) was already given back\n",
+							unlink->unlink_seqnum);
+			list_del(&unlink->list);
+			kfree(unlink);
+			continue;
+		}
+
+		urb->status = -ENODEV;
+
+		spin_lock(&the_controller->lock);
+		usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb);
+		spin_unlock(&the_controller->lock);
+
+		usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status);
+
 		list_del(&unlink->list);
 		kfree(unlink);
 	}
diff --git a/drivers/staging/usbip/vhci_rx.c b/drivers/staging/usbip/vhci_rx.c
index 7636d86c2388..2d989c487f61 100644
--- a/drivers/staging/usbip/vhci_rx.c
+++ b/drivers/staging/usbip/vhci_rx.c
@@ -21,16 +21,14 @@
 #include "vhci.h"
 
 
-/* get URB from transmitted urb queue */
-static struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev,
+/* get URB from transmitted urb queue. caller must hold vdev->priv_lock */
+struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev,
 					    __u32 seqnum)
 {
 	struct vhci_priv *priv, *tmp;
 	struct urb *urb = NULL;
 	int status;
 
-	spin_lock(&vdev->priv_lock);
-
 	list_for_each_entry_safe(priv, tmp, &vdev->priv_rx, list) {
 		if (priv->seqnum == seqnum) {
 			urb = priv->urb;
@@ -61,8 +59,6 @@ static struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev,
 		}
 	}
 
-	spin_unlock(&vdev->priv_lock);
-
 	return urb;
 }
 
@@ -72,9 +68,11 @@ static void vhci_recv_ret_submit(struct vhci_device *vdev,
 	struct usbip_device *ud = &vdev->ud;
 	struct urb *urb;
 
+	spin_lock(&vdev->priv_lock);
 
 	urb = pickup_urb_and_free_priv(vdev, pdu->base.seqnum);
 
+	spin_unlock(&vdev->priv_lock);
 
 	if (!urb) {
 		usbip_uerr("cannot find a urb of seqnum %u\n",
@@ -159,7 +157,12 @@ static void vhci_recv_ret_unlink(struct vhci_device *vdev,
 		return;
 	}
 
+	spin_lock(&vdev->priv_lock);
+
 	urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
+
+	spin_unlock(&vdev->priv_lock);
+
 	if (!urb) {
 		/*
 		 * I get the result of a unlink request. But, it seems that I