EHCI: fix bug in keeping track of resuming ports

This patch fixes a bug caused by backporting commit
cec3a53c7fe794237b582e8e77fc0e48465e65ee (USB: EHCI & UHCI: fix race
between root-hub suspend and port resume) to 2.6.27.stable without
also backporting commit eafe5b99f2135488b21cf17a262c54997c44f784 (USB:
EHCI: fix remote-wakeup support for ARC/TDI core).  This extracts the
necessary changes from the earlier patch and backports them.

The symptom of the bug is that the system will fail to suspend more
than once.  The problem is caused by setting ehci->reset_done[i] but
never clearing it.  When ehci_bus_suspend() sees a nonzero value
there, it assumes this means the port is in the middle of resuming so
it aborts the bus suspend.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: Corey Wright <undefined@pobox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index ef9b0383fed3cbd077b953a9a50e3b5276d464cf..f1a29e210af9ab805682194a88cd57d93ad4d707 100644 (file)
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -254,10 +254,8 @@ static int ehci_bus_resume (struct usb_hcd *hcd)
                temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
                temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
                if (test_bit(i, &ehci->bus_suspended) &&
-                               (temp & PORT_SUSPEND)) {
-                       ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
+                               (temp & PORT_SUSPEND))
                        temp |= PORT_RESUME;
-               }
                ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
        }
        i = HCS_N_PORTS (ehci->hcs_params);
@@ -752,6 +750,9 @@ static int ehci_hub_control (
                                        ehci_readl(ehci, status_reg));
                }
 
+               if (!(temp & (PORT_RESUME|PORT_RESET)))
+                       ehci->reset_done[wIndex] = 0;
+
                /* transfer dedicated ports to the companion hc */
                if ((temp & PORT_CONNECT) &&
                                test_bit(wIndex, &ehci->companion_ports)) {