Hi, while booting my Raspberry Pi 3 B+ with Linux 4.20 (arm64/defconfig) i'm getting the following warning:
[ 11.005738] irq 79 handler irq_default_primary_handler+0x0/0x8 enabled interrupts [ 11.024703] WARNING: CPU: 0 PID: 0 at kernel/irq/handle.c:153 __handle_irq_event_percpu+0x154/0x168 [ 11.045293] Modules linked in: brcmfmac vc4 brcmutil cfg80211 cec drm_kms_helper hci_uart drm btbcm bluetooth microchip lan78xx ecdh_generic rfkill crct10dif_ce drm_panel_orientation_quirks bcm2835_rng bcm2835_thermal pwm_bcm2835 raspberrypi_hwmon i2c_bcm2835 vchiq(C) rng_core ip_tables x_tables ipv6 [ 11.096874] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G C 4.20.0 #11 [ 11.116736] Hardware name: Raspberry Pi 3 Model B Plus Rev 1.3 (DT) [ 11.135405] pstate: 20000005 (nzCv daif -PAN -UAO) [ 11.152481] pc : __handle_irq_event_percpu+0x154/0x168 [ 11.169840] lr : __handle_irq_event_percpu+0x154/0x168 [ 11.187018] sp : ffff000008003ce0 [ 11.202234] x29: ffff000008003ce0 x28: 0000000000000000 [ 11.219467] x27: 0000000000000001 x26: ffff000008ebed00 [ 11.236619] x25: ffff0000092fe40a x24: ffff800035d7e800 [ 11.253679] x23: ffff0000091b9000 x22: 000000000000004f [ 11.270636] x21: ffff000008003d84 x20: 0000000000000002 [ 11.287449] x19: ffff800035572980 x18: ffffffffffffffff [ 11.304177] x17: 0000000000000000 x16: 0000000000000000 [ 11.320827] x15: ffff0000091b96c8 x14: 0720072007200720 [ 11.337364] x13: 0720072007200720 x12: ffff000008bfe738 [ 11.353996] x11: ffff80002d593c70 x10: 0000000000000001 [ 11.370541] x9 : 00000000ffffffff x8 : 0000000000000001 [ 11.387035] x7 : 0000000000000008 x6 : ffff8000393800b8 [ 11.403471] x5 : ffff8000393800b8 x4 : 0000000000000001 [ 11.419849] x3 : 0000000000000000 x2 : ffff0000091c2600 [ 11.436199] x1 : 16ca74a025baa300 x0 : 0000000000000000 [ 11.452495] Call trace: [ 11.465764] __handle_irq_event_percpu+0x154/0x168 [ 11.481439] handle_irq_event_percpu+0x34/0x88 [ 11.496695] handle_irq_event+0x48/0x78 [ 11.511242] handle_simple_irq+0x80/0xb8 [ 11.525787] generic_handle_irq+0x24/0x38 [ 11.540339] intr_complete+0xbc/0x100 [lan78xx] [ 11.555366] __usb_hcd_giveback_urb+0x6c/0xd8 [ 11.570137] usb_giveback_urb_bh+0xa8/0x108 [ 11.584699] tasklet_action_common.isra.2+0x80/0x130 [ 11.600056] tasklet_hi_action+0x24/0x30 [ 11.614255] __do_softirq+0x108/0x234 [ 11.628097] irq_exit+0xcc/0xd8 [ 11.641323] __handle_domain_irq+0x60/0xb8 [ 11.655516] bcm2836_arm_irqchip_handle_irq+0x64/0xb8 [ 11.670667] el1_irq+0xb0/0x128 [ 11.683770] arch_cpu_idle+0x10/0x18 [ 11.697275] do_idle+0x1c4/0x280 [ 11.710341] cpu_startup_entry+0x20/0x28 [ 11.724058] rest_init+0xd4/0xe0 [ 11.736962] arch_call_rest_init+0xc/0x14 [ 11.750625] start_kernel+0x3ec/0x418 This seems to come from the lan78xx driver, because i don't get this warning on the RPI 3B (smsc95xx). What's the approach to fix this issue? Is it just simply replace spin_lock_irq() with spin_lock_irqsave() at the right places? Regards Stefan
