Commit cec3a53c authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman
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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: default avatarAlan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 1b9a38bf

drivers/usb/host/ehci-hub.c

+19 −1
Original line number Diff line number Diff line
@@ -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;

drivers/usb/host/uhci-hcd.c

+14 −1
Original line number Diff line number Diff line
@@ -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;

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