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SubjectRe: [PATCH] led/ledtrig-heartbeat: Convert timers to use
On Fri, Oct 6, 2017 at 1:18 PM, Jacek Anaszewski
<jacek.anaszewski@gmail.com> wrote:
> Hi Kees,
>
> Thanks for the patch.
>
> On 10/05/2017 02:49 AM, Kees Cook wrote:
>> Instead of using .data directly, convert to from_timer. Since the
>> trigger_data is allocated separately, the led_cdev must be explicitly
>> tracked for the callback.
>>
>> Cc: Richard Purdie <rpurdie@rpsys.net>
>> Cc: Jacek Anaszewski <jacek.anaszewski@gmail.com>
>> Cc: Pavel Machek <pavel@ucw.cz>
>> Cc: Zhang Bo <bo.zhang@nxp.com>
>> Cc: Linus Walleij <linus.walleij@linaro.org>
>> Cc: Ingo Molnar <mingo@kernel.org>
>> Cc: linux-leds@vger.kernel.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/leds/trigger/ledtrig-heartbeat.c | 16 ++++++++++------
>> 1 file changed, 10 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/leds/trigger/ledtrig-heartbeat.c b/drivers/leds/trigger/ledtrig-heartbeat.c
>> index e95ea65380c8..f0896de410b8 100644
>> --- a/drivers/leds/trigger/ledtrig-heartbeat.c
>> +++ b/drivers/leds/trigger/ledtrig-heartbeat.c
>> @@ -25,19 +25,23 @@
>> static int panic_heartbeats;
>>
>> struct heartbeat_trig_data {
>> + struct led_classdev *led_cdev;
>> unsigned int phase;
>> unsigned int period;
>> struct timer_list timer;
>> unsigned int invert;
>> };
>>
>> -static void led_heartbeat_function(unsigned long data)
>> +static void led_heartbeat_function(struct timer_list *t)
>> {
>> - struct led_classdev *led_cdev = (struct led_classdev *) data;
>> - struct heartbeat_trig_data *heartbeat_data = led_cdev->trigger_data;
>> + struct heartbeat_trig_data *heartbeat_data =
>> + from_timer(heartbeat_data, t, timer);
>> + struct led_classdev *led_cdev;
>> unsigned long brightness = LED_OFF;
>> unsigned long delay = 0;
>>
>> + led_cdev = heartbeat_data->led_cdev;
>> +
>> if (unlikely(panic_heartbeats)) {
>> led_set_brightness_nosleep(led_cdev, LED_OFF);
>> return;
>> @@ -127,18 +131,18 @@ static void heartbeat_trig_activate(struct led_classdev *led_cdev)
>> return;
>>
>> led_cdev->trigger_data = heartbeat_data;
>> + heartbeat_data->led_cdev = led_cdev;
>> rc = device_create_file(led_cdev->dev, &dev_attr_invert);
>> if (rc) {
>> kfree(led_cdev->trigger_data);
>> return;
>> }
>>
>> - setup_timer(&heartbeat_data->timer,
>> - led_heartbeat_function, (unsigned long) led_cdev);
>> + timer_setup(&heartbeat_data->timer, led_heartbeat_function, 0);
>> heartbeat_data->phase = 0;
>> if (!led_cdev->blink_brightness)
>> led_cdev->blink_brightness = led_cdev->max_brightness;
>> - led_heartbeat_function(heartbeat_data->timer.data);
>> + led_heartbeat_function(&heartbeat_data->timer);
>> set_bit(LED_BLINK_SW, &led_cdev->work_flags);
>> led_cdev->activated = true;
>> }
>>
>
> It seems that the patch title is somewhat incomplete, so I amended
> it as follows:
>
> s/to use/to use timer_setup()/

Yeah, thanks for fixing that. This got pointed out elsewhere and I've
since hunted down and fixed my scripts to not accidentally truncate
subjects. *sigh* :)

> and applied to the for-next branch of linux-leds.git after rebasing
> it onto 4.14-rc3.

Thanks!

-Kees

--
Kees Cook
Pixel Security

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