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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2014-01-23 17:45:59 +0400 |
|---|---|---|
| committer | Minda Chen <minda.chen@starfivetech.com> | 2023-11-06 14:24:49 +0300 |
| commit | b2ca02aef571f2e348a5ca7e318e1f06b50b66d4 (patch) | |
| tree | 2c4a8bf6667682497548342da11d8c12ad5fc07a | |
| parent | 3d6ecbd481dc95a3e874c251697f12af2bc1018c (diff) | |
| download | linux-b2ca02aef571f2e348a5ca7e318e1f06b50b66d4.tar.xz | |
leds: trigger: Disable CPU trigger on PREEMPT_RT
The CPU trigger is invoked on ARM from CPU-idle. That trigger later
invokes led_trigger_event() which may invoke the callback of the actual driver.
That driver can acquire a spinlock_t which is okay on kernel without
PREEMPT_RT. On PREEMPT_RT enabled kernel this lock is turned into a sleeping
lock and must not be acquired with disabled interrupts.
Disable the CPU trigger on PREEMPT_RT.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lkml.kernel.org/r/20210924111501.m57cwwn7ahiyxxdd@linutronix.de
| -rw-r--r-- | drivers/leds/trigger/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/leds/trigger/Kconfig b/drivers/leds/trigger/Kconfig index 1f1d57288085..dc6816d36d06 100644 --- a/drivers/leds/trigger/Kconfig +++ b/drivers/leds/trigger/Kconfig @@ -64,6 +64,7 @@ config LEDS_TRIGGER_BACKLIGHT config LEDS_TRIGGER_CPU bool "LED CPU Trigger" + depends on !PREEMPT_RT help This allows LEDs to be controlled by active CPUs. This shows the active CPUs across an array of LEDs so you can see which |