USB: UHCI: disable remote wakeup when it's not needed

This patch (as1084b) fixes the way uhci-hcd handles polling and
remote wakeups for its root hubs.  When remote wakeup is disabled,
neither interrupts nor polling should be enabled during a root-hub
suspend.  Likewise, if interrupts are enabled during suspend then
polling isn't needed.

Furthermore the EGSM (Enter Global Suspend Mode) bit shouldn't be set
in the Command register unless remote wakeup is enabled.  Apparently
some controllers will issue a remote-wakeup interrupt whenever EGSM
is on, even if Resume-Detect interrupts are supposedly disabled.

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

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/usb/host/uhci-hcd.h b/drivers/usb/host/uhci-hcd.h
index 340d6ed3e6e9..7d01c5677f92 100644
--- a/drivers/usb/host/uhci-hcd.h
+++ b/drivers/usb/host/uhci-hcd.h
@@ -400,8 +400,9 @@ struct uhci_hcd {
         unsigned int scan_in_progress:1;        /* Schedule scan is running */
         unsigned int need_rescan:1;             /* Redo the schedule scan */
         unsigned int dead:1;                    /* Controller has died */
-        unsigned int working_RD:1;              /* Suspended root hub doesn't
-                                                   need to be polled */
+        unsigned int RD_enable:1;               /* Suspended root hub with
+                                                   Resume-Detect interrupts
+                                                   enabled */
         unsigned int is_initialized:1;          /* Data structure is usable */
         unsigned int fsbr_is_on:1;              /* FSBR is turned on */
         unsigned int fsbr_is_wanted:1;          /* Does any URB want FSBR? */