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LED fixes for 4.20-rc2

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Merge tag 'led-fixes-for-4.20-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds

Pull LED fixes from Jacek Anaszewski:
 "All three fixes are related to the newly added pattern trigger:

   - remove mutex_lock() from timer callback, which would trigger
     problems related to sleeping in atomic context, the removal is
     harmless since mutex protection turned out to be redundant in this
     case

   - fix pattern parsing to properly handle intervals with brightness == 0

   - fix typos in the ABI documentation"

* tag 'led-fixes-for-4.20-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds:
  Documentation: ABI: led-trigger-pattern: Fix typos
  leds: trigger: Fix sleeping function called from invalid context
  Fix pattern handling optimalization
This commit is contained in:
Linus Torvalds 2018-11-08 17:49:04 -06:00
commit 6a1ac56c23
2 changed files with 10 additions and 21 deletions
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4
Documentation/ABI/testing/sysfs-class-led-trigger-pattern
View File

@ -37,8 +37,8 @@ Description:
0-| / \/ \/
+---0----1----2----3----4----5----6------------> time (s)
2. To make the LED go instantly from one brigntess value to another,
we should use use zero-time lengths (the brightness must be same as
2. To make the LED go instantly from one brightness value to another,
we should use zero-time lengths (the brightness must be same as
the previous tuple's). So the format should be:
"brightness_1 duration_1 brightness_1 0 brightness_2 duration_2
brightness_2 0 ...". For example:

23
drivers/leds/trigger/ledtrig-pattern.c
View File

@ -75,8 +75,6 @@ static void pattern_trig_timer_function(struct timer_list *t)
{
struct pattern_trig_data *data = from_timer(data, t, timer);
mutex_lock(&data->lock);
for (;;) {
if (!data->is_indefinite && !data->repeat)
break;
@ -87,9 +85,10 @@ static void pattern_trig_timer_function(struct timer_list *t)
data->curr->brightness);
mod_timer(&data->timer,
jiffies + msecs_to_jiffies(data->curr->delta_t));
if (!data->next->delta_t) {
/* Skip the tuple with zero duration */
pattern_trig_update_patterns(data);
}
/* Select next tuple */
pattern_trig_update_patterns(data);
} else {
@ -116,8 +115,6 @@ static void pattern_trig_timer_function(struct timer_list *t)
break;
}
mutex_unlock(&data->lock);
}
static int pattern_trig_start_pattern(struct led_classdev *led_cdev)
@ -176,14 +173,10 @@ static ssize_t repeat_store(struct device *dev, struct device_attribute *attr,
if (res < -1 || res == 0)
return -EINVAL;
/*
* Clear previous patterns' performence firstly, and remove the timer
* without mutex lock to avoid dead lock.
*/
del_timer_sync(&data->timer);
mutex_lock(&data->lock);
del_timer_sync(&data->timer);
if (data->is_hw_pattern)
led_cdev->pattern_clear(led_cdev);
@ -234,14 +227,10 @@ static ssize_t pattern_trig_store_patterns(struct led_classdev *led_cdev,
struct pattern_trig_data *data = led_cdev->trigger_data;
int ccount, cr, offset = 0, err = 0;
/*
* Clear previous patterns' performence firstly, and remove the timer
* without mutex lock to avoid dead lock.
*/
del_timer_sync(&data->timer);
mutex_lock(&data->lock);
del_timer_sync(&data->timer);
if (data->is_hw_pattern)
led_cdev->pattern_clear(led_cdev);