USB: EHCI: add need_io_watchdog flag to ehci_hcd
Basically the io watchdog is only useful for those quirk HCDs. For most
good ones, it only brings unnecessary wakeups. At least, I know the
Intel EHCI HCDs should turn off the flag.
Signed-off-by: Alek Du <alek.du@intel.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 54715b8..2dc15f3 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -127,6 +127,8 @@
switch (action) {
case TIMER_IO_WATCHDOG:
+ if (!ehci->need_io_watchdog)
+ return;
t = EHCI_IO_JIFFIES;
break;
case TIMER_ASYNC_OFF:
@@ -508,6 +510,10 @@
spin_lock_init(&ehci->lock);
+ /*
+ * keep io watchdog by default, those good HCDs could turn off it later
+ */
+ ehci->need_io_watchdog = 1;
init_timer(&ehci->watchdog);
ehci->watchdog.function = ehci_watchdog;
ehci->watchdog.data = (unsigned long) ehci;