1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 88cb4ada686e..82caf336e9b6 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -94,6 +94,13 @@ static int ehci_bus_resume (struct usb_hcd *hcd)
                 msleep(5);
         spin_lock_irq (&ehci->lock);
 
+        /* Ideally and we've got a real resume here, and no port's power
+         * was lost.  (For PCI, that means Vaux was maintained.)  But we
+         * could instead be restoring a swsusp snapshot -- so that BIOS was
+         * the last user of the controller, not reset/pm hardware keeping
+         * state we gave to it.
+         */
+
         /* re-init operational registers in case we lost power */
         if (readl (&ehci->regs->intr_enable) == 0) {
                 /* at least some APM implementations will try to deliver