USB: EHCI & UHCI: fix race between root-hub suspend and port resume

This patch (as1321) fixes a problem with EHCI and UHCI root-hub
suspends: If the suspend occurs while a port is trying to resume, the
resume doesn't finish and simply gets lost.  When remote wakeup is
enabled, this is undesirable behavior.

The patch checks first to see if any port resumes are in progress, and
if they are then it fails the root-hub suspend with -EBUSY.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 33 insertions, 2 deletions

diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 2c6571c..c75d927 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -120,9 +120,26 @@ static int ehci_bus_suspend (struct usb_hcd *hcd)
 	del_timer_sync(&ehci->watchdog);
 	del_timer_sync(&ehci->iaa_watchdog);
 
-	port = HCS_N_PORTS (ehci->hcs_params);
 	spin_lock_irq (&ehci->lock);
 
+	/* Once the controller is stopped, port resumes that are already
+	 * in progress won't complete.  Hence if remote wakeup is enabled
+	 * for the root hub and any ports are in the middle of a resume or
+	 * remote wakeup, we must fail the suspend.
+	 */
+	if (hcd->self.root_hub->do_remote_wakeup) {
+		port = HCS_N_PORTS(ehci->hcs_params);
+		while (port--) {
+			if (ehci->reset_done[port] != 0) {
+				spin_unlock_irq(&ehci->lock);
+				ehci_dbg(ehci, "suspend failed because "
+						"port %d is resuming\n",
+						port + 1);
+				return -EBUSY;
+			}
+		}
+	}
+
 	/* stop schedules, clean any completed work */
 	if (HC_IS_RUNNING(hcd->state)) {
 		ehci_quiesce (ehci);
@@ -138,6 +155,7 @@ static int ehci_bus_suspend (struct usb_hcd *hcd)
 	 */
 	ehci->bus_suspended = 0;
 	ehci->owned_ports = 0;
+	port = HCS_N_PORTS(ehci->hcs_params);
 	while (port--) {
 		u32 __iomem	*reg = &ehci->regs->port_status [port];
 		u32		t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index 5cd0e48..99cd00f 100644
--- a/drivers/usb/host/uhci-hcd.c
+++ b/drivers/usb/host/uhci-hcd.c
@@ -749,7 +749,20 @@ static int uhci_rh_suspend(struct usb_hcd *hcd)
 	spin_lock_irq(&uhci->lock);
 	if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
 		rc = -ESHUTDOWN;
-	else if (!uhci->dead)
+	else if (uhci->dead)
+		;		/* Dead controllers tell no tales */
+
+	/* Once the controller is stopped, port resumes that are already
+	 * in progress won't complete.  Hence if remote wakeup is enabled
+	 * for the root hub and any ports are in the middle of a resume or
+	 * remote wakeup, we must fail the suspend.
+	 */
+	else if (hcd->self.root_hub->do_remote_wakeup &&
+			uhci->resuming_ports) {
+		dev_dbg(uhci_dev(uhci), "suspend failed because a port "
+				"is resuming\n");
+		rc = -EBUSY;
+	} else
 		suspend_rh(uhci, UHCI_RH_SUSPENDED);
 	spin_unlock_irq(&uhci->lock);
 	return rc;