[PATCH] xhci: Convert timers to use timer_setup()

[Kees Cook]

In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly.

Cc: Mathias Nyman <mathias.nyman@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: linux-usb@xxxxxxxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
---
 drivers/usb/host/xhci-mem.c  | 4 ++--
 drivers/usb/host/xhci-ring.c | 9 +++------
 drivers/usb/host/xhci.h      | 2 +-
 3 files changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index b81a2317420b..795219a397d3 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -800,8 +800,8 @@ void xhci_free_stream_info(struct xhci_hcd *xhci,
 static void xhci_init_endpoint_timer(struct xhci_hcd *xhci,
 		struct xhci_virt_ep *ep)
 {
-	setup_timer(&ep->stop_cmd_timer, xhci_stop_endpoint_command_watchdog,
-		    (unsigned long)ep);
+	timer_setup(&ep->stop_cmd_timer, xhci_stop_endpoint_command_watchdog,
+		    0);
 	ep->xhci = xhci;
 }
 
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 4764121ba2b1..e35eed16c842 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -947,15 +947,12 @@ void xhci_hc_died(struct xhci_hcd *xhci)
  * Instead we use a combination of that flag and checking if a new timer is
  * pending.
  */
-void xhci_stop_endpoint_command_watchdog(unsigned long arg)
+void xhci_stop_endpoint_command_watchdog(struct timer_list *t)
 {
-	struct xhci_hcd *xhci;
-	struct xhci_virt_ep *ep;
+	struct xhci_virt_ep *ep = from_timer(ep, t, stop_cmd_timer);
+	struct xhci_hcd *xhci = ep->xhci;
 	unsigned long flags;
 
-	ep = (struct xhci_virt_ep *) arg;
-	xhci = ep->xhci;
-
 	spin_lock_irqsave(&xhci->lock, flags);
 
 	/* bail out if cmd completed but raced with stop ep watchdog timer.*/
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index b966cd878351..86df906aec46 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -2076,7 +2076,7 @@ void xhci_queue_new_dequeue_state(struct xhci_hcd *xhci,
 		struct xhci_dequeue_state *deq_state);
 void xhci_cleanup_stalled_ring(struct xhci_hcd *xhci, unsigned int ep_index,
 		unsigned int stream_id, struct xhci_td *td);
-void xhci_stop_endpoint_command_watchdog(unsigned long arg);
+void xhci_stop_endpoint_command_watchdog(struct timer_list *t);
 void xhci_handle_command_timeout(struct work_struct *work);
 
 void xhci_ring_ep_doorbell(struct xhci_hcd *xhci, unsigned int slot_id,
-- 
2.7.4


-- 
Kees Cook
Pixel Security