linux-kernel - [PATCH 3.16.y-ckt 039/104] usb: xhci: Allow usb_add/remove

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Message-Id: <1445867006-18048-40-git-send-email-luis.henriques@canonical.com>
Date:	Mon, 26 Oct 2015 13:42:21 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Roger Quadros <rogerq@...com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 039/104] usb: xhci: Allow usb_add/remove_hcd() to be called repeatedly

3.16.7-ckt19 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Roger Quadros <rogerq@...com>

commit 8a853759c262fd52ff0f5e89f89c65928077fe4a upstream.

Don't set xhci->shared_hcd to NULL in xhci_stop() as we have
still not de-allocated it. It was resulting in a NULL pointer
de-reference if usb_add/remove_hcd() is called repeatedly.

We want repeated add/remove to work for the OTG use case.

Signed-off-by: Roger Quadros <rogerq@...com>
Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/usb/host/xhci.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 4170d913ee6e..d7f3adf56af2 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -663,12 +663,6 @@ static void xhci_only_stop_hcd(struct usb_hcd *hcd)
 
 	spin_lock_irq(&xhci->lock);
 	xhci_halt(xhci);
-
-	/* The shared_hcd is going to be deallocated shortly (the USB core only
-	 * calls this function when allocation fails in usb_add_hcd(), or
-	 * usb_remove_hcd() is called).  So we need to unset xHCI's pointer.
-	 */
-	xhci->shared_hcd = NULL;
 	spin_unlock_irq(&xhci->lock);
 }
 
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