[34-longterm 128/247] staging: usbip: vhci: use urb->dev->portnum to find port

Paul Gortmaker
2011-06-23T17:36:55Z

From: Max Vozeler <max@vozeler.com>

-------------------
This is a commit scheduled for the next v2.6.34 longterm release.
If you see a problem with using this for longterm, please comment.
-------------------

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>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
drivers/staging/usbip/vhci.h | 3 ---
drivers/staging/usbip/vhci_hcd.c | 4 +---
2 files changed, 1 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/usbip/vhci.h b/drivers/staging/usbip/vhci.h
index ad3a19d..57f7946 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 006d5f7..fd4cc48 100644
--- a/drivers/staging/usbip/vhci_hcd.c
+++ b/drivers/staging/usbip/vhci_hcd.c
@@ -138,8 +138,6 @@ 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));
@@ -575,7 +573,7 @@ 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);
--
1.7.4.4