ALSA: drivers: 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/drivers/serial-u16550.c

@@ -309,12 +309,12 @@ static irqreturn_t snd_uart16550_interrupt(int irq, void *dev_id)
 }
 
 /* When the polling mode, this function calls snd_uart16550_io_loop. */
-static void snd_uart16550_buffer_timer(unsigned long data)
+static void snd_uart16550_buffer_timer(struct timer_list *t)
 {
 	unsigned long flags;
 	struct snd_uart16550 *uart;
 
-	uart = (struct snd_uart16550 *)data;
+	uart = from_timer(uart, t, buffer_timer);
 	spin_lock_irqsave(&uart->open_lock, flags);
 	snd_uart16550_del_timer(uart);
 	snd_uart16550_io_loop(uart);
@@ -828,8 +828,7 @@ static int snd_uart16550_create(struct snd_card *card,
 	uart->prev_in = 0;
 	uart->rstatus = 0;
 	memset(uart->prev_status, 0x80, sizeof(unsigned char) * SNDRV_SERIAL_MAX_OUTS);
-	setup_timer(&uart->buffer_timer, snd_uart16550_buffer_timer,
-		    (unsigned long)uart);
+	timer_setup(&uart->buffer_timer, snd_uart16550_buffer_timer, 0);
 	uart->timer_running = 0;
 
 	/* Register device */