drm/i915/selftests: Convert timers to use timer_setup()

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: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: intel-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20171024151344.GA104417@beastReviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/selftests/lib_sw_fence.c

@@ -49,9 +49,9 @@ void onstack_fence_fini(struct i915_sw_fence *fence)
 	i915_sw_fence_fini(fence);
 }
 
-static void timed_fence_wake(unsigned long data)
+static void timed_fence_wake(struct timer_list *t)
 {
-	struct timed_fence *tf = (struct timed_fence *)data;
+	struct timed_fence *tf = from_timer(tf, t, timer);
 
 	i915_sw_fence_commit(&tf->fence);
 }
@@ -60,7 +60,7 @@ void timed_fence_init(struct timed_fence *tf, unsigned long expires)
 {
 	onstack_fence_init(&tf->fence);
 
-	setup_timer_on_stack(&tf->timer, timed_fence_wake, (unsigned long)tf);
+	timer_setup_on_stack(&tf->timer, timed_fence_wake, 0);
 
 	if (time_after(expires, jiffies))
 		mod_timer(&tf->timer, expires);