ALSA: usb-audio: 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.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/line6/toneport.c

@@ -241,9 +241,9 @@ static int snd_toneport_source_put(struct snd_kcontrol *kcontrol,
 	return 1;
 }
 
-static void toneport_start_pcm(unsigned long arg)
+static void toneport_start_pcm(struct timer_list *t)
 {
-	struct usb_line6_toneport *toneport = (struct usb_line6_toneport *)arg;
+	struct usb_line6_toneport *toneport = from_timer(toneport, t, timer);
 	struct usb_line6 *line6 = &toneport->line6;
 
 	line6_pcm_acquire(line6->line6pcm, LINE6_STREAM_MONITOR, true);
@@ -415,8 +415,7 @@ static int toneport_init(struct usb_line6 *line6,
 	struct usb_line6_toneport *toneport =  (struct usb_line6_toneport *) line6;
 
 	toneport->type = id->driver_info;
-	setup_timer(&toneport->timer, toneport_start_pcm,
-		    (unsigned long)toneport);
+	timer_setup(&toneport->timer, toneport_start_pcm, 0);
 
 	line6->disconnect = line6_toneport_disconnect;