[PATCH] USB: fix locking loop by avoiding flush_scheduled_work

This patch (as1027) replaces a call to flush_scheduled_work() -- a
dangerous routine to invoke, especially while holding any sort of lock
-- with calls to cancel_work_sync() and cancel_delayed_work_sync().

This fixes Bugzilla #9532.

Signed-off-by: Alan Stern <stern-nwvwT67g6+6dFdvTe/[email protected]>
CC: David Brownell <david-b-yBeKhBN/[email protected]>

---

This is a candidate for 2.6.24.


Index: usb-2.6/drivers/usb/core/hub.c
===================================================================
--- usb-2.6.orig/drivers/usb/core/hub.c
+++ usb-2.6/drivers/usb/core/hub.c
@@ -529,9 +529,9 @@ static void hub_quiesce(struct usb_hub *
 	/* (blocking) stop khubd and related activity */
 	usb_kill_urb(hub->urb);
 	if (hub->has_indicators)
-		cancel_delayed_work(&hub->leds);
-	if (hub->has_indicators || hub->tt.hub)
-		flush_scheduled_work();
+		cancel_delayed_work_sync(&hub->leds);
+	if (hub->tt.hub)
+		cancel_work_sync(&hub->tt.kevent);
 }
 
 static void hub_activate(struct usb_hub *hub)

-
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html