Linux LED trigger bug scheduling on I2C GPIO expander

[abhisit]

Dear all,

Question

Please help me to fix issue "BUG: scheduling while atomic: swapper...Preemption disabled at:[< (null)>] (null)".

Extra Information

I have check function regmap (used to read/write I2C) is using mutex lock.

I also try to use LED hearbeat trigger, the LED is working and I see the same error message all the time on the terminal and demsg.

Device Tree

card-leds {
        compatible = "gpio-leds";

        active-load {
                label = "active-load";
                gpios = <&lmp92001_gpio 0 GPIO_ACTIVE_HIGH>;
                default-state = "off";
                linux,default-trigger = "oneshot";
        };
};

Shell operation

root@alc-imx6:~# uname -a
Linux alc-imx6 4.1.15-g12145c5-dirty #2 SMP PREEMPT Mon Feb 20 17:40:17 ICT 2017 armv7l GNU/Linux

root@alc-imx6:~# cd /sys/class/leds/active-load
root@alc-imx6:/sys/class/leds/active-load# ls
brightness delay_on invert power subsystem uevent
delay_off device max_brightness shot trigger
root@alc-imx6:/sys/class/leds/active-load# cat trigger
none nand-disk mmc0 mmc1 mmc2 timer [oneshot] heartbeat backlight gpio default-on rfkill0

root@alc-imx6:/sys/class/leds/active-load# echo 33 > delay_on
root@alc-imx6:/sys/class/leds/active-load# echo 33 > delay_off
root@alc-imx6:/sys/class/leds/active-load# echo 1 > shot

root@alc-imx6:/sys/class/leds/active-load# BUG: scheduling while atomic: swapper/0/0/0x00000102
Modules linked in:
Preemption disabled at:[< (null)>] (null)

CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.1.15-g12145c5-dirty #2
Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[<80016390>] (unwind_backtrace) from [<800123d4>] (show_stack+0x10/0x14)
[<800123d4>] (show_stack) from [<806d6064>] (dump_stack+0x80/0xc0)
[<806d6064>] (dump_stack) from [<806d3f2c>] (__schedule_bug+0xa8/0xbc)
[<806d3f2c>] (__schedule_bug) from [<806d91b8>] (__schedule+0x480/0x4f4)
[<806d91b8>] (__schedule) from [<806d926c>] (schedule+0x40/0x98)
[<806d926c>] (schedule) from [<8042eb14>] (i2c_imx_bus_busy+0x68/0xf0)
[<8042eb14>] (i2c_imx_bus_busy) from [<8042f15c>] (i2c_imx_xfer+0x308/0xe84)
[<8042f15c>] (i2c_imx_xfer) from [<8042bb44>] (__i2c_transfer+0x144/0x284)
[<8042bb44>] (__i2c_transfer) from [<8042bd24>] (i2c_transfer+0xa0/0xd8)
[<8042bd24>] (i2c_transfer) from [<8042bff0>] (i2c_smbus_xfer+0x1f8/0x58c)
[<8042bff0>] (i2c_smbus_xfer) from [<8042c7a4>] (i2c_smbus_write_byte_data+0x40/0x48)
[<8042c7a4>] (i2c_smbus_write_byte_data) from [<8033813c>] (_regmap_update_bits+0x50/0x74)
[<8033813c>] (_regmap_update_bits) from [<80338eec>] (regmap_update_bits+0x40/0x5c)
[<80338eec>] (regmap_update_bits) from [<804ebaec>] (led_timer_function+0xdc/0xe4)
[<804ebaec>] (led_timer_function) from [<8007b814>] (call_timer_fn+0x24/0x98)
[<8007b814>] (call_timer_fn) from [<8007be10>] (run_timer_softirq+0x1e4/0x260)
[<8007be10>] (run_timer_softirq) from [<80039f14>] (__do_softirq+0x108/0x260)
[<80039f14>] (__do_softirq) from [<8003a30c>] (irq_exit+0xc0/0xfc)
[<8003a30c>] (irq_exit) from [<8006d720>] (__handle_domain_irq+0x80/0xe8)
[<8006d720>] (__handle_domain_irq) from [<800093cc>] (gic_handle_irq+0x24/0x5c)
[<800093cc>] (gic_handle_irq) from [<80012ec0>] (__irq_svc+0x40/0x74)
Exception stack(0x809bff18 to 0x809bff60)
ff00: 809bff60 fffffff7
ff20: 43b4bb93 0000001a 62fe91d9 0000001a 8bb22e90 00000000 629d88b4 0000001a
ff40: 809b9304 00000001 a6aaaaab 809bff60 00000017 80488ad4 00010013 ffffffff
[<80012ec0>] (__irq_svc) from [<80488ad4>] (cpuidle_enter_state+0xb8/0x1e0)
[<80488ad4>] (cpuidle_enter_state) from [<80065440>] (cpu_startup_entry+0x220/0x344)
[<80065440>] (cpu_startup_entry) from [<80960c50>] (start_kernel+0x3a8/0x3b4)
BUG: scheduling while atomic: swapper/0/0/0x00000102
Modules linked in:
Preemption disabled at:[< (null)>] (null)

CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 4.1.15-g12145c5-dirty #2
Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[<80016390>] (unwind_backtrace) from [<800123d4>] (show_stack+0x10/0x14)
[<800123d4>] (show_stack) from [<806d6064>] (dump_stack+0x80/0xc0)
[<806d6064>] (dump_stack) from [<806d3f2c>] (__schedule_bug+0xa8/0xbc)
[<806d3f2c>] (__schedule_bug) from [<806d91b8>] (__schedule+0x480/0x4f4)
[<806d91b8>] (__schedule) from [<806d926c>] (schedule+0x40/0x98)
[<806d926c>] (schedule) from [<806db9c4>] (schedule_timeout+0x110/0x170)
[<806db9c4>] (schedule_timeout) from [<8042eddc>] (i2c_imx_trx_complete+0x50/0xc8)
[<8042eddc>] (i2c_imx_trx_complete) from [<8042f2b8>] (i2c_imx_xfer+0x464/0xe84)
[<8042f2b8>] (i2c_imx_xfer) from [<8042bb44>] (__i2c_transfer+0x144/0x284)
[<8042bb44>] (__i2c_transfer) from [<8042bd24>] (i2c_transfer+0xa0/0xd8)
[<8042bd24>] (i2c_transfer) from [<8042bff0>] (i2c_smbus_xfer+0x1f8/0x58c)
[<8042bff0>] (i2c_smbus_xfer) from [<8042c7a4>] (i2c_smbus_write_byte_data+0x40/0x48)
[<8042c7a4>] (i2c_smbus_write_byte_data) from [<8033813c>] (_regmap_update_bits+0x50/0x74)
[<8033813c>] (_regmap_update_bits) from [<80338eec>] (regmap_update_bits+0x40/0x5c)
[<80338eec>] (regmap_update_bits) from [<804ebaec>] (led_timer_function+0xdc/0xe4)
[<804ebaec>] (led_timer_function) from [<8007b814>] (call_timer_fn+0x24/0x98)
[<8007b814>] (call_timer_fn) from [<8007be10>] (run_timer_softirq+0x1e4/0x260)
[<8007be10>] (run_timer_softirq) from [<80039f14>] (__do_softirq+0x108/0x260)
[<80039f14>] (__do_softirq) from [<8003a30c>] (irq_exit+0xc0/0xfc)
[<8003a30c>] (irq_exit) from [<8006d720>] (__handle_domain_irq+0x80/0xe8)
[<8006d720>] (__handle_domain_irq) from [<800093cc>] (gic_handle_irq+0x24/0x5c)
[<800093cc>] (gic_handle_irq) from [<80012ec0>] (__irq_svc+0x40/0x74)
Exception stack(0x809bff18 to 0x809bff60)
ff00: 809bff60 fffffff7
ff20: 43b4bb93 0000001a 62fe91d9 0000001a 8bb22e90 00000000 629d88b4 0000001a
ff40: 809b9304 00000001 a6aaaaab 809bff60 00000017 80488ad4 00010013 ffffffff
[<80012ec0>] (__irq_svc) from [<80488ad4>] (cpuidle_enter_state+0xb8/0x1e0)
[<80488ad4>] (cpuidle_enter_state) from [<80065440>] (cpu_startup_entry+0x220/0x344)
[<80065440>] (cpu_startup_entry) from [<80960c50>] (start_kernel+0x3a8/0x3b4)
BUG: scheduling while atomic: swapper/0/0/0x00000102
Modules linked in:
Preemption disabled at:[< (null)>] (null)

CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 4.1.15-g12145c5-dirty #2
Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[<80016390>] (unwind_backtrace) from [<800123d4>] (show_stack+0x10/0x14)
[<800123d4>] (show_stack) from [<806d6064>] (dump_stack+0x80/0xc0)
[<806d6064>] (dump_stack) from [<806d3f2c>] (__schedule_bug+0xa8/0xbc)
[<806d3f2c>] (__schedule_bug) from [<806d91b8>] (__schedule+0x480/0x4f4)
[<806d91b8>] (__schedule) from [<806d926c>] (schedule+0x40/0x98)
[<806d926c>] (schedule) from [<8042eb14>] (i2c_imx_bus_busy+0x68/0xf0)
[<8042eb14>] (i2c_imx_bus_busy) from [<8042f8a0>] (i2c_imx_xfer+0xa4c/0xe84)
[<8042f8a0>] (i2c_imx_xfer) from [<8042bb44>] (__i2c_transfer+0x144/0x284)
[<8042bb44>] (__i2c_transfer) from [<8042bd24>] (i2c_transfer+0xa0/0xd8)
[<8042bd24>] (i2c_transfer) from [<8042bff0>] (i2c_smbus_xfer+0x1f8/0x58c)
[<8042bff0>] (i2c_smbus_xfer) from [<8042c7a4>] (i2c_smbus_write_byte_data+0x40/0x48)
[<8042c7a4>] (i2c_smbus_write_byte_data) from [<8033813c>] (_regmap_update_bits+0x50/0x74)
[<8033813c>] (_regmap_update_bits) from [<80338eec>] (regmap_update_bits+0x40/0x5c)
[<80338eec>] (regmap_update_bits) from [<804ebaec>] (led_timer_function+0xdc/0xe4)
[<804ebaec>] (led_timer_function) from [<8007b814>] (call_timer_fn+0x24/0x98)
[<8007b814>] (call_timer_fn) from [<8007be10>] (run_timer_softirq+0x1e4/0x260)
[<8007be10>] (run_timer_softirq) from [<80039f14>] (__do_softirq+0x108/0x260)
[<80039f14>] (__do_softirq) from [<8003a30c>] (irq_exit+0xc0/0xfc)
[<8003a30c>] (irq_exit) from [<8006d720>] (__handle_domain_irq+0x80/0xe8)
[<8006d720>] (__handle_domain_irq) from [<800093cc>] (gic_handle_irq+0x24/0x5c)
[<800093cc>] (gic_handle_irq) from [<80012ec0>] (__irq_svc+0x40/0x74)
Exception stack(0x809bff18 to 0x809bff60)
ff00: 809bff60 fffffff7
ff20: 43b4bb93 0000001a 62fe91d9 0000001a 8bb22e90 00000000 629d88b4 0000001a
ff40: 809b9304 00000001 a6aaaaab 809bff60 00000017 80488ad4 00010013 ffffffff
[<80012ec0>] (__irq_svc) from [<80488ad4>] (cpuidle_enter_state+0xb8/0x1e0)
[<80488ad4>] (cpuidle_enter_state) from [<80065440>] (cpu_startup_entry+0x220/0x344)
[<80065440>] (cpu_startup_entry) from [<80960c50>] (start_kernel+0x3a8/0x3b4)
BUG: scheduling while atomic: swapper/0/0/0x00000102
Modules linked in:
Preemption disabled at:[< (null)>] (null)

CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 4.1.15-g12145c5-dirty #2
Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[<80016390>] (unwind_backtrace) from [<800123d4>] (show_stack+0x10/0x14)
[<800123d4>] (show_stack) from [<806d6064>] (dump_stack+0x80/0xc0)
[<806d6064>] (dump_stack) from [<806d3f2c>] (__schedule_bug+0xa8/0xbc)
[<806d3f2c>] (__schedule_bug) from [<806d91b8>] (__schedule+0x480/0x4f4)
[<806d91b8>] (__schedule) from [<806d926c>] (schedule+0x40/0x98)
[<806d926c>] (schedule) from [<8042eb14>] (i2c_imx_bus_busy+0x68/0xf0)
[<8042eb14>] (i2c_imx_bus_busy) from [<8042f15c>] (i2c_imx_xfer+0x308/0xe84)
[<8042f15c>] (i2c_imx_xfer) from [<8042bb44>] (__i2c_transfer+0x144/0x284)
[<8042bb44>] (__i2c_transfer) from [<8042bd24>] (i2c_transfer+0xa0/0xd8)
[<8042bd24>] (i2c_transfer) from [<8042bff0>] (i2c_smbus_xfer+0x1f8/0x58c)
[<8042bff0>] (i2c_smbus_xfer) from [<8042c7a4>] (i2c_smbus_write_byte_data+0x40/0x48)
[<8042c7a4>] (i2c_smbus_write_byte_data) from [<8033813c>] (_regmap_update_bits+0x50/0x74)
[<8033813c>] (_regmap_update_bits) from [<80338eec>] (regmap_update_bits+0x40/0x5c)
[<80338eec>] (regmap_update_bits) from [<804ebaec>] (led_timer_function+0xdc/0xe4)
[<804ebaec>] (led_timer_function) from [<8007b814>] (call_timer_fn+0x24/0x98)
[<8007b814>] (call_timer_fn) from [<8007be10>] (run_timer_softirq+0x1e4/0x260)
[<8007be10>] (run_timer_softirq) from [<80039f14>] (__do_softirq+0x108/0x260)
[<80039f14>] (__do_softirq) from [<8003a30c>] (irq_exit+0xc0/0xfc)
[<8003a30c>] (irq_exit) from [<8006d720>] (__handle_domain_irq+0x80/0xe8)
[<8006d720>] (__handle_domain_irq) from [<800093cc>] (gic_handle_irq+0x24/0x5c)
[<800093cc>] (gic_handle_irq) from [<80012ec0>] (__irq_svc+0x40/0x74)
Exception stack(0x809bff18 to 0x809bff60)
ff00: 809bff60 fffffff7
ff20: 7f4f8593 0000001a 8b868d27 0000001a 8bb22e90 00000000 8aee8db1 0000001a
ff40: 809b9304 00000001 a6aaaaab 809bff60 00000017 80488ad4 900f0013 ffffffff
[<80012ec0>] (__irq_svc) from [<80488ad4>] (cpuidle_enter_state+0xb8/0x1e0)
[<80488ad4>] (cpuidle_enter_state) from [<80065440>] (cpu_startup_entry+0x220/0x344)
[<80065440>] (cpu_startup_entry) from [<80960c50>] (start_kernel+0x3a8/0x3b4)
BUG: scheduling while atomic: swapper/0/0/0x00000102
Modules linked in:
Preemption disabled at:[< (null)>] (null)

CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 4.1.15-g12145c5-dirty #2
Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[<80016390>] (unwind_backtrace) from [<800123d4>] (show_stack+0x10/0x14)
[<800123d4>] (show_stack) from [<806d6064>] (dump_stack+0x80/0xc0)
[<806d6064>] (dump_stack) from [<806d3f2c>] (__schedule_bug+0xa8/0xbc)
[<806d3f2c>] (__schedule_bug) from [<806d91b8>] (__schedule+0x480/0x4f4)
[<806d91b8>] (__schedule) from [<806d926c>] (schedule+0x40/0x98)
[<806d926c>] (schedule) from [<806db9c4>] (schedule_timeout+0x110/0x170)
[<806db9c4>] (schedule_timeout) from [<8042eddc>] (i2c_imx_trx_complete+0x50/0xc8)
[<8042eddc>] (i2c_imx_trx_complete) from [<8042f2b8>] (i2c_imx_xfer+0x464/0xe84)
[<8042f2b8>] (i2c_imx_xfer) from [<8042bb44>] (__i2c_transfer+0x144/0x284)
[<8042bb44>] (__i2c_transfer) from [<8042bd24>] (i2c_transfer+0xa0/0xd8)
[<8042bd24>] (i2c_transfer) from [<8042bff0>] (i2c_smbus_xfer+0x1f8/0x58c)
[<8042bff0>] (i2c_smbus_xfer) from [<8042c7a4>] (i2c_smbus_write_byte_data+0x40/0x48)
[<8042c7a4>] (i2c_smbus_write_byte_data) from [<8033813c>] (_regmap_update_bits+0x50/0x74)
[<8033813c>] (_regmap_update_bits) from [<80338eec>] (regmap_update_bits+0x40/0x5c)
[<80338eec>] (regmap_update_bits) from [<804ebaec>] (led_timer_function+0xdc/0xe4)
[<804ebaec>] (led_timer_function) from [<8007b814>] (call_timer_fn+0x24/0x98)
[<8007b814>] (call_timer_fn) from [<8007be10>] (run_timer_softirq+0x1e4/0x260)
[<8007be10>] (run_timer_softirq) from [<80039f14>] (__do_softirq+0x108/0x260)
[<80039f14>] (__do_softirq) from [<8003a30c>] (irq_exit+0xc0/0xfc)
[<8003a30c>] (irq_exit) from [<8006d720>] (__handle_domain_irq+0x80/0xe8)
[<8006d720>] (__handle_domain_irq) from [<800093cc>] (gic_handle_irq+0x24/0x5c)
[<800093cc>] (gic_handle_irq) from [<80012ec0>] (__irq_svc+0x40/0x74)
Exception stack(0x809bff18 to 0x809bff60)
ff00: 809bff60 fffffff7
ff20: 7f4f8593 0000001a 8b868d27 0000001a 8bb22e90 00000000 8aee8db1 0000001a
ff40: 809b9304 00000001 a6aaaaab 809bff60 00000017 80488ad4 900f0013 ffffffff
[<80012ec0>] (__irq_svc) from [<80488ad4>] (cpuidle_enter_state+0xb8/0x1e0)
[<80488ad4>] (cpuidle_enter_state) from [<80065440>] (cpu_startup_entry+0x220/0x344)
[<80065440>] (cpu_startup_entry) from [<80960c50>] (start_kernel+0x3a8/0x3b4)
BUG: scheduling while atomic: swapper/0/0/0x00000102
Modules linked in:
Preemption disabled at:[< (null)>] (null)

CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 4.1.15-g12145c5-dirty #2
Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[<80016390>] (unwind_backtrace) from [<800123d4>] (show_stack+0x10/0x14)
[<800123d4>] (show_stack) from [<806d6064>] (dump_stack+0x80/0xc0)
[<806d6064>] (dump_stack) from [<806d3f2c>] (__schedule_bug+0xa8/0xbc)
[<806d3f2c>] (__schedule_bug) from [<806d91b8>] (__schedule+0x480/0x4f4)
[<806d91b8>] (__schedule) from [<806d926c>] (schedule+0x40/0x98)
[<806d926c>] (schedule) from [<8042eb14>] (i2c_imx_bus_busy+0x68/0xf0)
[<8042eb14>] (i2c_imx_bus_busy) from [<8042f8a0>] (i2c_imx_xfer+0xa4c/0xe84)
[<8042f8a0>] (i2c_imx_xfer) from [<8042bb44>] (__i2c_transfer+0x144/0x284)
[<8042bb44>] (__i2c_transfer) from [<8042bd24>] (i2c_transfer+0xa0/0xd8)
[<8042bd24>] (i2c_transfer) from [<8042bff0>] (i2c_smbus_xfer+0x1f8/0x58c)
[<8042bff0>] (i2c_smbus_xfer) from [<8042c7a4>] (i2c_smbus_write_byte_data+0x40/0x48)
[<8042c7a4>] (i2c_smbus_write_byte_data) from [<8033813c>] (_regmap_update_bits+0x50/0x74)
[<8033813c>] (_regmap_update_bits) from [<80338eec>] (regmap_update_bits+0x40/0x5c)
[<80338eec>] (regmap_update_bits) from [<804ebaec>] (led_timer_function+0xdc/0xe4)
[<804ebaec>] (led_timer_function) from [<8007b814>] (call_timer_fn+0x24/0x98)
[<8007b814>] (call_timer_fn) from [<8007be10>] (run_timer_softirq+0x1e4/0x260)
[<8007be10>] (run_timer_softirq) from [<80039f14>] (__do_softirq+0x108/0x260)
[<80039f14>] (__do_softirq) from [<8003a30c>] (irq_exit+0xc0/0xfc)
[<8003a30c>] (irq_exit) from [<8006d720>] (__handle_domain_irq+0x80/0xe8)
[<8006d720>] (__handle_domain_irq) from [<800093cc>] (gic_handle_irq+0x24/0x5c)
[<800093cc>] (gic_handle_irq) from [<80012ec0>] (__irq_svc+0x40/0x74)
Exception stack(0x809bff18 to 0x809bff60)
ff00: 809bff60 fffffff7
ff20: 7f4f8593 0000001a 8b868d27 0000001a 8bb22e90 00000000 8aee8db1 0000001a
ff40: 809b9304 00000001 a6aaaaab 809bff60 00000017 80488ad4 900f0013 ffffffff
[<80012ec0>] (__irq_svc) from [<80488ad4>] (cpuidle_enter_state+0xb8/0x1e0)
[<80488ad4>] (cpuidle_enter_state) from [<80065440>] (cpu_startup_entry+0x220/0x344)
[<80065440>] (cpu_startup_entry) from [<80960c50>] (start_kernel+0x3a8/0x3b4)

Thank you for your reply,

Abhisit Sangjan

[igorpadykov]

Hi Abhisit

expanders are supported on sabre ai boards (like sch-27142)

Schematics (5)
Design files for i.MX 6Quad and i.MX 6DualLite CPU1 Cards
Design files for Base Board (REV E)

http://www.nxp.com/products/software-and-tools/hardware-development-tools/sabre-development-system/s...

and one can look for MAX7310 entries in imx6qdl-sabreauto.dtsi

Best regards
igor
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