[PATCH] watchdog: lpc18xx_wdt: Convert timers to use

[PATCH] watchdog: lpc18xx_wdt: Convert timers to use

[Kees Cook]

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@iguana.be>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Joachim Eastwood <manabian@gmail.com>
Cc: linux-watchdog@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Kees Cook <keescook@chromium.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

Re: [PATCH] watchdog: lpc18xx_wdt: Convert timers to use

[Guenter Roeck]

On 10/04/2017 05:54 PM, Kees Cook wrote:
> 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@iguana.be>
> Cc: Guenter Roeck <linux@roeck-us.net>
> Cc: Joachim Eastwood <manabian@gmail.com>
> Cc: linux-watchdog@vger.kernel.org
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Signed-off-by: Kees Cook <keescook@chromium.org>

Acked-by: Guenter Roeck <linux@roeck-us.net>

> ---
> 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);
>