linux-kernel - [PATCH 27/93] USB: UHCI: fix IRQ race during initialization

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Message-Id: <1360102042-10732-28-git-send-email-herton.krzesinski@canonical.com>
Date:	Tue,  5 Feb 2013 20:06:16 -0200
From:	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
Subject: [PATCH 27/93] USB: UHCI: fix IRQ race during initialization

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

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

From: Alan Stern <stern@...land.harvard.edu>

commit 0f815a0a700bc10547449bde6c106051a035a1b9 upstream.

This patch (as1644) fixes a race that occurs during startup in
uhci-hcd.  If the IRQ line is shared with other devices, it's possible
for the handler routine to be called before the data structures are
fully initialized.

The problem is fixed by adding a check to the IRQ handler routine.  If
the initialization hasn't finished yet, the routine will return
immediately.

Signed-off-by: Alan Stern <stern@...land.harvard.edu>
Reported-by: Don Zickus <dzickus@...hat.com>
Tested-by: "Huang, Adrian (ISS Linux TW)" <adrian.huang@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
---
 drivers/usb/host/uhci-hcd.c |   15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index e4db350..3fe069f 100644
--- a/drivers/usb/host/uhci-hcd.c
+++ b/drivers/usb/host/uhci-hcd.c
@@ -447,6 +447,10 @@ static irqreturn_t uhci_irq(struct usb_hcd *hcd)
 		return IRQ_NONE;
 	uhci_writew(uhci, status, USBSTS);		/* Clear it */
 
+	spin_lock(&uhci->lock);
+	if (unlikely(!uhci->is_initialized))	/* not yet configured */
+		goto done;
+
 	if (status & ~(USBSTS_USBINT | USBSTS_ERROR | USBSTS_RD)) {
 		if (status & USBSTS_HSE)
 			dev_err(uhci_dev(uhci), "host system error, "
@@ -455,7 +459,6 @@ static irqreturn_t uhci_irq(struct usb_hcd *hcd)
 			dev_err(uhci_dev(uhci), "host controller process "
 					"error, something bad happened!\n");
 		if (status & USBSTS_HCH) {
-			spin_lock(&uhci->lock);
 			if (uhci->rh_state >= UHCI_RH_RUNNING) {
 				dev_err(uhci_dev(uhci),
 					"host controller halted, "
@@ -473,15 +476,15 @@ static irqreturn_t uhci_irq(struct usb_hcd *hcd)
 				 * pending unlinks */
 				mod_timer(&hcd->rh_timer, jiffies);
 			}
-			spin_unlock(&uhci->lock);
 		}
 	}
 
-	if (status & USBSTS_RD)
+	if (status & USBSTS_RD) {
+		spin_unlock(&uhci->lock);
 		usb_hcd_poll_rh_status(hcd);
-	else {
-		spin_lock(&uhci->lock);
+	} else {
 		uhci_scan_schedule(uhci);
+ done:
 		spin_unlock(&uhci->lock);
 	}
 
@@ -662,9 +665,9 @@ static int uhci_start(struct usb_hcd *hcd)
 	 */
 	mb();
 
+	spin_lock_irq(&uhci->lock);
 	configure_hc(uhci);
 	uhci->is_initialized = 1;
-	spin_lock_irq(&uhci->lock);
 	start_rh(uhci);
 	spin_unlock_irq(&uhci->lock);
 	return 0;
-- 
1.7.9.5

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