diff options
Diffstat (limited to 'debian/patches-rt/leds-trigger-Disable-CPU-trigger-on-PREEMPT_RT.patch')
| -rw-r--r-- | debian/patches-rt/leds-trigger-Disable-CPU-trigger-on-PREEMPT_RT.patch | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/debian/patches-rt/leds-trigger-Disable-CPU-trigger-on-PREEMPT_RT.patch b/debian/patches-rt/leds-trigger-Disable-CPU-trigger-on-PREEMPT_RT.patch new file mode 100644 index 000000000..eab2fab46 --- /dev/null +++ b/debian/patches-rt/leds-trigger-Disable-CPU-trigger-on-PREEMPT_RT.patch @@ -0,0 +1,29 @@ +From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Date: Thu, 23 Jan 2014 14:45:59 +0100 +Subject: [PATCH] leds: trigger: Disable CPU trigger on PREEMPT_RT +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.15/older/patches-5.15.3-rt21.tar.xz + +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 +--- + drivers/leds/trigger/Kconfig | 1 + + 1 file changed, 1 insertion(+) + +--- 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 |