linux-kernel - [PATCH] watchdog: lpc18xx_wdt: Convert timers to use

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Date:   Wed, 4 Oct 2017 17:54:02 -0700
From:   Kees Cook <keescook@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     Wim Van Sebroeck <wim@...ana.be>,
        Guenter Roeck <linux@...ck-us.net>,
        Joachim Eastwood <manabian@...il.com>,
        linux-watchdog@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH] 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 <wim@...ana.be>
Cc: Guenter Roeck <linux@...ck-us.net>
Cc: Joachim Eastwood <manabian@...il.com>
Cc: linux-watchdog@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
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(-)

diff --git a/drivers/watchdog/lpc18xx_wdt.c b/drivers/watchdog/lpc18xx_wdt.c
index 3b8bb59adf02..b4221f43cd94 100644
--- a/drivers/watchdog/lpc18xx_wdt.c
+++ b/drivers/watchdog/lpc18xx_wdt.c
@@ -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);
-- 
2.7.4


-- 
Kees Cook
Pixel Security