From: Max Vozeler <max@vozeler.com>
Date: Wed, 12 Jan 2011 13:02:05 +0000 (+0200)
Subject: staging: usbip: vhci: use urb->dev->portnum to find port
X-Git-Tag: firefly_0821_release~10186^2~395
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e9053787c8757b2c210d3db2f866bc8036ae205f;p=firefly-linux-kernel-4.4.55.git

staging: usbip: vhci: use urb->dev->portnum to find port

commit 01446ef5af4e8802369bf4d257806e24345a9371 upstream.

The access to pending_port was racy when two devices
were being attached at the same time.

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

diff --git a/drivers/staging/usbip/vhci.h b/drivers/staging/usbip/vhci.h
index ad3a19dac545..57f79463de9c 100644
--- a/drivers/staging/usbip/vhci.h
+++ b/drivers/staging/usbip/vhci.h
@@ -100,9 +100,6 @@ struct vhci_hcd {
 	 * But, the index of this array begins from 0.
 	 */
 	struct vhci_device vdev[VHCI_NPORTS];
-
-	/* vhci_device which has not been assiged its address yet */
-	int pending_port;
 };
 
 
diff --git a/drivers/staging/usbip/vhci_hcd.c b/drivers/staging/usbip/vhci_hcd.c
index 235ad04924fb..1c173195c516 100644
--- a/drivers/staging/usbip/vhci_hcd.c
+++ b/drivers/staging/usbip/vhci_hcd.c
@@ -137,8 +137,6 @@ void rh_port_connect(int rhport, enum usb_device_speed speed)
 	 * the_controller->vdev[rhport].ud.status = VDEV_CONNECT;
 	 * spin_unlock(&the_controller->vdev[rhport].ud.lock); */
 
-	the_controller->pending_port = rhport;
-
 	spin_unlock_irqrestore(&the_controller->lock, flags);
 
 	usb_hcd_poll_rh_status(vhci_to_hcd(the_controller));
@@ -574,7 +572,7 @@ static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
 		return urb->status;
 	}
 
-	vdev = port_to_vdev(the_controller->pending_port);
+	vdev = port_to_vdev(urb->dev->portnum-1);
 
 	/* refuse enqueue for dead connection */
 	spin_lock(&vdev->ud.lock);