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| author | Pavel Machek <pavel@ucw.cz> | 2019-05-26 10:38:55 +0300 |
|---|---|---|
| committer | Jacek Anaszewski <jacek.anaszewski@gmail.com> | 2019-05-26 19:39:38 +0300 |
| commit | 433068aa88cc1046db0adf0d158d98f59d846bbc (patch) | |
| tree | 274f0f7a126588c56d011c48960b4436d7459f8f /drivers/leds/trigger | |
| parent | e9a804d7a428432d8ad0bc7984f459daf0cc4da3 (diff) | |
| download | linux-433068aa88cc1046db0adf0d158d98f59d846bbc.tar.xz | |
leds: avoid flush_work in atomic context
It turns out that various triggers use led_blink_setup() from atomic
context, so we can't do a flush_work there. Flush is still needed for
slow LEDs, but we can move it to sysfs code where it is safe.
WARNING: inconsistent lock state
5.2.0-rc1 #1 Tainted: G W
--------------------------------
inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
swapper/1/0 [HC0[0]:SC1[1]:HE1:SE0] takes:
000000006e30541b
((work_completion)(&led_cdev->set_brightness_work)){+.?.}, at:
+__flush_work+0x3b/0x38a
{SOFTIRQ-ON-W} state was registered at:
lock_acquire+0x146/0x1a1
__flush_work+0x5b/0x38a
flush_work+0xb/0xd
led_blink_setup+0x1e/0xd3
led_blink_set+0x3f/0x44
tpt_trig_timer+0xdb/0x106
ieee80211_mod_tpt_led_trig+0xed/0x112
Fixes: 0db37915d912 ("leds: avoid races with workqueue")
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Tested-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Diffstat (limited to 'drivers/leds/trigger')
| -rw-r--r-- | drivers/leds/trigger/ledtrig-timer.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/leds/trigger/ledtrig-timer.c b/drivers/leds/trigger/ledtrig-timer.c index ca898c1383be..427fc3c303d5 100644 --- a/drivers/leds/trigger/ledtrig-timer.c +++ b/drivers/leds/trigger/ledtrig-timer.c @@ -113,6 +113,11 @@ static int timer_trig_activate(struct led_classdev *led_cdev) led_cdev->flags &= ~LED_INIT_DEFAULT_TRIGGER; } + /* + * If "set brightness to 0" is pending in workqueue, we don't + * want that to be reordered after blink_set() + */ + flush_work(&led_cdev->set_brightness_work); led_blink_set(led_cdev, &led_cdev->blink_delay_on, &led_cdev->blink_delay_off); |