tty: cyclades: 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. Moves timer structures
from global to attached to struct cyclades_port.

Cc: Jiri Slaby <jslaby@suse.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/cyclades.c

@@ -286,8 +286,7 @@ static long cyz_polling_cycle = CZ_DEF_POLL;
 static DEFINE_TIMER(cyz_timerlist, cyz_poll, 0, 0);
 
 #else				/* CONFIG_CYZ_INTR */
-static void cyz_rx_restart(unsigned long);
-static struct timer_list cyz_rx_full_timer[NR_PORTS];
+static void cyz_rx_restart(struct timer_list *);
 #endif				/* CONFIG_CYZ_INTR */
 
 static void cyy_writeb(struct cyclades_port *port, u32 reg, u8 val)
@@ -992,10 +991,8 @@ static void cyz_handle_rx(struct cyclades_port *info)
 	else
 		char_count = rx_put - rx_get + rx_bufsize;
 	if (char_count >= readl(&buf_ctrl->rx_threshold) &&
-			!timer_pending(&cyz_rx_full_timer[
-					info->line]))
-		mod_timer(&cyz_rx_full_timer[info->line],
-				jiffies + 1);
+			!timer_pending(&info->rx_full_timer))
+		mod_timer(&info->rx_full_timer, jiffies + 1);
 #endif
 	info->idle_stats.recv_idle = jiffies;
 	tty_schedule_flip(&info->port);
@@ -1197,9 +1194,9 @@ static irqreturn_t cyz_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }				/* cyz_interrupt */
 
-static void cyz_rx_restart(unsigned long arg)
+static void cyz_rx_restart(struct timer_list *t)
 {
-	struct cyclades_port *info = (struct cyclades_port *)arg;
+	struct cyclades_port *info = from_timer(info, t, rx_full_timer);
 	struct cyclades_card *card = info->card;
 	int retval;
 	__u32 channel = info->line - card->first_line;
@@ -3097,8 +3094,7 @@ static int cy_init_card(struct cyclades_card *cinfo)
 			else
 				info->xmit_fifo_size = 4 * CYZ_FIFO_SIZE;
 #ifdef CONFIG_CYZ_INTR
-			setup_timer(&cyz_rx_full_timer[port],
-				cyz_rx_restart, (unsigned long)info);
+			timer_setup(&info->rx_full_timer, cyz_rx_restart, 0);
 #endif
 		} else {
 			unsigned short chip_number;

include/linux/cyclades.h

@@ -156,6 +156,9 @@ struct cyclades_port {
 	struct cyclades_icount	icount;
 	struct completion       shutdown_wait;
 	int throttle;
+#ifdef CONFIG_CYZ_INTR
+	struct timer_list	rx_full_timer;
+#endif
 };
 
 #define	CLOSING_WAIT_DELAY	30*HZ