Hi Mark, Ajit
> From: Ajit Pandey <aj...@codeaurora.org>
> Date: Wed, 9 Jan 2019 14:17:07 +0530
> Subject: [PATCH] ASoC: soc-core: defer card probe until all component is added
> to list
>
> DAI component probe is not called if it is not present
> in component list during sound card registration.
> Check if component is available in component list for
> platform and cpu dai before soundcard registration.
>
> Signed-off-by: Ajit Pandey <aj...@codeaurora.org>
> Signed-off-by: Rohit kumar <rohi...@codeaurora.org>
> Signed-off-by: Mark Brown <broo...@kernel.org>
> ---
I got below WARNING by this patch.
I guess we need mutex_lock() on snd_soc_register_card() ?
...
[drm] Device feb00000.display probed
[drm] Cannot find any crtc or sizes
[drm] Cannot find any crtc or sizes
WARNING: CPU: 0 PID: 76 at sound/soc/soc-core.c:739
soc_find_component+0xb8/0xc0
CPU: 0 PID: 76 Comm: kworker/0:1 Not tainted 5.0.0-rc1+ #1360
Hardware name: Renesas H3ULCB Kingfisher board based on r8a7795 ES2.0+
(DT)
Workqueue: events deferred_probe_work_func
pstate: 60000005 (nZCv daif -PAN -UAO)
pc : soc_find_component+0xb8/0xc0
lr : soc_find_component+0xb4/0xc0
sp : ffff00001217ba10
x29: ffff00001217ba10 x28: 0000000000000000
x27: ffff000010a82920 x26: 0000000000000000
x25: ffff8006f9c59900 x24: ffff0000105f33a0
x23: ffff000010948d70 x22: 0000000000000000
x21: ffff000010af1720 x20: ffff8006ff80b6d8
x19: ffff8006f8523080 x18: 0000000000000010
x17: 0000000000000000 x16: 0000000000000000
x15: ffffffffffffffff x14: 0720072007200720
x13: 0720072007200720 x12: 0720072007200720
x11: 0720072007200720 x10: 0720072007200720
x9 : 0000000000000000 x8 : ffff000010a85000
x7 : ffff000010114bd4 x6 : 0000000000000001
x5 : 0000000000000018 x4 : 0000000000000001
x3 : 0000000000000000 x2 : 0000000000000003
x1 : ffff000010af17b0 x0 : 0000000000000000
Call trace:
soc_find_component+0xb8/0xc0
soc_init_dai_link+0x18c/0x210
snd_soc_register_card.part.16+0x138/0x198
snd_soc_register_card+0x30/0x48
devm_snd_soc_register_card+0x4c/0xa0
graph_probe+0x2d8/0x388
platform_drv_probe+0x58/0xa8
really_probe+0x1c0/0x2a0
driver_probe_device+0x5c/0xf0
__device_attach_driver+0x9c/0xe0
...
