linux-kernel - [PATCH 7/7] staging: usbip: vhci: use urb->dev->portnum to find port

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Message-Id: <1294837325-26187-8-git-send-email-max@vozeler.com>
Date:	Wed, 12 Jan 2011 15:02:05 +0200
From:	Max Vozeler <max@...eler.com>
To:	gregkh@...e.de
Cc:	hirofuchi@...rs.sourceforge.net, rpjday@...shcourse.ca,
	bgmerrell@...ell.com, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, mwehby@...otticaRetail.com,
	marco@...ikam.com, Max Vozeler <max@...eler.com>
Subject: [PATCH 7/7] staging: usbip: vhci: use urb->dev->portnum to find port

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

Signed-off-by: Max Vozeler <max@...eler.com>
Tested-by: Mark Wehby <MWehby@...otticaRetail.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 2cfd00e..afc3b1a 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 22b1ad9..a35fe61 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);
-- 
1.7.2.3

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