[alsa-devel] some lock needed for flush_delayed_work ?

[Kuninori Morimoto]

Hi ALSA ML

I got below error when I unbind/bind CPU DAI.
It seems we need to have some kind of lock ?
I think => message came from

	linux/kernel/locking/lockdep.c :: assign_lock_key

	...
	[    6.392640] asoc-audio-graph-card sound: ASoC: CPU DAI  not registered
=>	[    6.399430] INFO: trying to register non-static key.
=>	[    6.404393] the code is fine but needs lockdep annotation.
=>	[    6.409875] turning off the locking correctness validator.
	[    6.415362] CPU: 2 PID: 193 Comm: test-bind-unbin Not tainted 5.3.0-rc1+ #625
	[    6.422495] Hardware name: Renesas H3ULCB Kingfisher board based on r8a7795 ES2.0+ (DT)
	[    6.430497] Call trace:
	[    6.432949]  dump_backtrace+0x0/0x140
	[    6.436609]  show_stack+0x24/0x30
	[    6.439927]  dump_stack+0xc4/0x10c
	[    6.443328]  register_lock_class+0x4e0/0x618
	[    6.447594]  __lock_acquire+0x7c/0x1de8
	[    6.451426]  lock_acquire+0xdc/0x1e0
	[    6.455000]  del_timer_sync+0x60/0xe8
	[    6.458660]  flush_delayed_work+0x2c/0x70
	[    6.462671]  soc_cleanup_card_resources+0x50/0x348
	[    6.467459]  snd_soc_bind_card+0x1e4/0x990
	[    6.471551]  snd_soc_add_component+0x248/0x310
	[    6.475992]  snd_soc_register_component+0x54/0x70
	[    6.480696]  devm_snd_soc_register_component+0x60/0xb8
	[    6.485833]  rsnd_probe+0x164/0x448
	[    6.489321]  platform_drv_probe+0x58/0xa8
	[    6.493330]  really_probe+0xec/0x2a0
	[    6.496902]  driver_probe_device+0x5c/0xf0
	[    6.500996]  device_driver_attach+0x74/0x80
	[    6.505177]  bind_store+0xdc/0x120
	[    6.508575]  drv_attr_store+0x40/0x58
	[    6.512237]  sysfs_kf_write+0x50/0x78
	[    6.515896]  kernfs_fop_write+0xf0/0x1e8
	[    6.519819]  __vfs_write+0x48/0x90
	[    6.523218]  vfs_write+0xac/0x1b8
	[    6.526529]  ksys_write+0x74/0xf8
	[    6.529840]  __arm64_sys_write+0x24/0x30
	[    6.533762]  el0_svc_common.constprop.0+0x98/0x170
	[    6.538550]  el0_svc_compat_handler+0x2c/0x38
	[    6.542904]  el0_svc_compat+0x8/0x10


Thank you for your help !!
Best regards
---
Kuninori Morimoto