linux-kernel - [ 052/117] USB: ohci-at91: add a reset function to fix race condition

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Date:	Mon, 28 May 2012 04:12:54 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Nicolas Ferre <nicolas.ferre@...el.com>,
	Christian Eggers <christian.eggers@...hrein.de>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [ 052/117] USB: ohci-at91: add a reset function to fix race condition

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

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

From: Nicolas Ferre <nicolas.ferre@...el.com>

commit 07e4e556eff4938eb2edf2591de3aa7d7fb82b52 upstream.

A possible race condition appears because we are not initializing
the ohci->regs before calling usb_hcd_request_irqs().
We move the call to ohci_init() in hcd->driver->reset() instead of
hcd->driver->start() to fix this.
This was experienced when we share the same IRQ line between OHCI and EHCI
controllers.

Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
Tested-by: Christian Eggers <christian.eggers@...hrein.de>
Acked-by: Alan Stern <stern@...land.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/host/ohci-at91.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

--- a/drivers/usb/host/ohci-at91.c
+++ b/drivers/usb/host/ohci-at91.c
@@ -199,7 +199,7 @@
 /*-------------------------------------------------------------------------*/
 
 static int __devinit
-ohci_at91_start (struct usb_hcd *hcd)
+ohci_at91_reset (struct usb_hcd *hcd)
 {
 	struct at91_usbh_data	*board = hcd->self.controller->platform_data;
 	struct ohci_hcd		*ohci = hcd_to_ohci (hcd);
@@ -209,6 +209,14 @@
 		return ret;
 
 	ohci->num_ports = board->ports;
+	return 0;
+}
+
+static int __devinit
+ohci_at91_start (struct usb_hcd *hcd)
+{
+	struct ohci_hcd		*ohci = hcd_to_ohci (hcd);
+	int			ret;
 
 	if ((ret = ohci_run(ohci)) < 0) {
 		err("can't start %s", hcd->self.bus_name);
@@ -390,6 +398,7 @@
 	/*
 	 * basic lifecycle operations
 	 */
+	.reset =		ohci_at91_reset,
 	.start =		ohci_at91_start,
 	.stop =			ohci_stop,
 	.shutdown =		ohci_shutdown,


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