watchdog: lpc18xx_wdt: Convert timers to use

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 Wim Van Sebroeck <[email protected]>

Cc Guenter Roeck <[email protected]>

Cc Joachim Eastwood <[email protected]>

Cc linux-watchdog at vger.kernel.org

Cc linux-arm-kernel at lists.infradead.org

Cc Thomas Gleixner <[email protected]>

Signed-off-by Kees Cook <[email protected]>

---
This requires commit 686fef928bba ("timer: Prepare to change timer callback argument type") in v4.14-rc3, but should be otherwise stand-alone.

---
  drivers/watchdog/lpc18xx_wdt.c | 13 +++++++------
  1 file changed, 7 insertions(+), 6 deletions(-)

drivers/watchdog/lpc18xx_wdt.c +7 -6

index 3b8bb59adf02..b4221f43cd94 100644
@@ -78,10 +78,10 @@ static int lpc18xx_wdt_feed(struct watchdog_device *wdt_dev)
  	return 0;
  }
 
-static void lpc18xx_wdt_timer_feed(unsigned long data)
+static void lpc18xx_wdt_timer_feed(struct timer_list *t)
  {
-	struct watchdog_device *wdt_dev = (struct watchdog_device *)data;
-	struct lpc18xx_wdt_dev *lpc18xx_wdt = watchdog_get_drvdata(wdt_dev);
+	struct lpc18xx_wdt_dev *lpc18xx_wdt = from_timer(lpc18xx_wdt, t, timer);
+	struct watchdog_device *wdt_dev = &lpc18xx_wdt->wdt_dev;
 
  	lpc18xx_wdt_feed(wdt_dev);
 

@@ -96,7 +96,9 @@ static void lpc18xx_wdt_timer_feed(unsigned long data)
   */
  static int lpc18xx_wdt_stop(struct watchdog_device *wdt_dev)
  {
-	lpc18xx_wdt_timer_feed((unsigned long)wdt_dev);
+	struct lpc18xx_wdt_dev *lpc18xx_wdt = watchdog_get_drvdata(wdt_dev);
+
+	lpc18xx_wdt_timer_feed(&lpc18xx_wdt->timer);
 
  	return 0;
  }

@@ -267,8 +269,7 @@ static int lpc18xx_wdt_probe(struct platform_device *pdev)
 
  	__lpc18xx_wdt_set_timeout(lpc18xx_wdt);
 
-	setup_timer(&lpc18xx_wdt->timer, lpc18xx_wdt_timer_feed,
-		    (unsigned long)&lpc18xx_wdt->wdt_dev);
+	timer_setup(&lpc18xx_wdt->timer, lpc18xx_wdt_timer_feed, 0);
 
  	watchdog_set_nowayout(&lpc18xx_wdt->wdt_dev, nowayout);
  	watchdog_set_restart_priority(&lpc18xx_wdt->wdt_dev, 128);