[PATCH] USB: "sparse -Wcontext" and USB HCDs ...

This adds "sparse -Wcontext" annotations to the main HCDs, reflecting that
they all need to drop their (schedule) lock while issuing URB completion
callbacks.  (Some completion callbacks will resubmit that URB, relying on
that to keep the endpoint queue from emptying and getting descheduled.)
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

drivers/usb/host/ehci-q.c

@@ -175,6 +175,8 @@ static void qtd_copy_status (
 
 static void
 ehci_urb_done (struct ehci_hcd *ehci, struct urb *urb, struct pt_regs *regs)
+__releases(ehci->lock)
+__acquires(ehci->lock)
 {
 	if (likely (urb->hcpriv != 0)) {
 		struct ehci_qh	*qh = (struct ehci_qh *) urb->hcpriv;

drivers/usb/host/ohci-q.c

@@ -35,6 +35,8 @@ static void urb_free_priv (struct ohci_hcd *hc, urb_priv_t *urb_priv)
  */
 static void
 finish_urb (struct ohci_hcd *ohci, struct urb *urb, struct pt_regs *regs)
+__releases(ohci->lock)
+__acquires(ohci->lock)
 {
 	// ASSERT (urb->hcpriv != 0);
 

drivers/usb/host/uhci-hcd.c

@@ -1602,7 +1602,10 @@ static void uhci_free_pending_tds(struct uhci_hcd *uhci)
 	}
 }
 
-static void uhci_finish_urb(struct usb_hcd *hcd, struct urb *urb, struct pt_regs *regs)
+static void
+uhci_finish_urb(struct usb_hcd *hcd, struct urb *urb, struct pt_regs *regs)
+__releases(uhci->schedule_lock)
+__acquires(uhci->schedule_lock)
 {
 	struct uhci_hcd *uhci = hcd_to_uhci(hcd);