Hi Robert;

I am playing with AC97+WM9714 of TINY6410 board. I had made it to retrieve

WM8914's vendor id but  a BUG at probing WM97xx MFD device.

After digging, I thought the offending code is 'structure assignment' at line 74.

Both ac97->dev and adev->dev are objects of type 'struct device' rather than

'struct device *'.

65 struct snd_ac97 *snd_ac97_compat_alloc(struct ac97_codec_device *adev)  66 {  67         struct snd_ac97 *ac97;  68  69         ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL);  70         if (ac97 == NULL)  71                 return ERR_PTR(-ENOMEM);  72  73         printk("%s: %s %px\n", __func__, dev_name(&adev->dev), &adev->dev);  74         ac97->dev = adev->dev;  75

Below is a quick hack I came up with.

diff --git a/sound/ac97/snd_ac97_compat.c b/sound/ac97/snd_ac97_compat.c index 61544e0d8de4..1ba2e7f48b41 100644 --- a/sound/ac97/snd_ac97_compat.c +++ b/sound/ac97/snd_ac97_compat.c @@ -70,7 +70,9 @@ struct snd_ac97 *snd_ac97_compat_alloc(struct ac97_codec_device *adev)          if (ac97 == NULL)                  return ERR_PTR(-ENOMEM);

-        ac97->dev = adev->dev; +        device_initialize(&ac97->dev); +        dev_set_name(&ac97->dev, "%s-compat", dev_name(&adev->dev)); +          ac97->private_data = adev;          ac97->bus = &compat_soc_ac97_bus;          return ac97;

[    2.657160] ac97_bus_scan: 574d4c13 [    2.661390] ac97_bus_probe: 7f001000.ac97:0 [    2.665256] snd_ac97_compat_alloc: 7f001000.ac97:0 cf0d3000 [    2.670349] wm97xx-core 7f001000.ac97:0: wm97xx core found, id=0x574d4c13 [    2.677338] __devm_regmap_init_ac97: 7f001000.ac97:0 cf2c4dd0 [    2.682838] __devm_regmap_init: 7f001000.ac97:0 cf2c4dd0 [    2.688795] list_add corruption. prev->next should be next (cf2c4f60), but was cf0d3190. (prev=cf20b480). [    2.697775] ------------[ cut here ]------------ [    2.702262] kernel BUG at /workspace/tiny6410/kernel/linux-stable/lib/list_debug.c:28! [    2.710156] Internal error: Oops - BUG: 0 [#1] PREEMPT ARM [    2.715622] Modules linked in: [    2.718667] CPU: 0 PID: 1 Comm: swapper Not tainted 4.18.0-rc8 #100 [    2.724904] Hardware name: Samsung S3C64xx (Flattened Device Tree) [    2.731093] PC is at __list_add_valid+0x68/0x78 [    2.735588] LR is at __list_add_valid+0x68/0x78 [    2.740089] pc : [<c02ec4ac>]    lr : [<c02ec4ac>]    psr: 20000093 [    2.746336] sp : cf887c18  ip : 60000093  fp : 00000000 [    2.751541] r10: 00000000  r9 : cf2c4dd0  r8 : cf2b5e00 [    2.756750] r7 : cf2c4f60  r6 : cf20b480  r5 : cf2c4dd0  r4 : cf1250c0 [    2.763255] r3 : 00000001  r2 : cf886000  r1 : cf886004  r0 : 0000005d [    2.769766] Flags: nzCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment none [    2.776966] Control: 00c5387d  Table: 50004008  DAC: 00000051 [    2.782693] Process swapper (pid: 1, stack limit = 0x(ptrval)) [    2.788505] Stack: (0xcf887c18 to 0xcf888000) [    2.792848] 7c00: cf1250c0 c034dbf8 [    2.801013] 7c20: a0000013 cf1250c0 a0000013 cf2c4f50 cf2c4dd0 a0000013 cf1250d0 c034e318 [    2.809168] 7c40: cf2b5e00 cf2c4dd0 00000000 cf2c4c00 cf2b5e00 c03629e4 0000002f cf2b5e00 [    2.817324] 7c60: c05d2ba8 c03634f4 00000000 00000000 00000000 c005b968 cf2b5e9c cf2b5e94 [    2.825481] 7c80: c05d13c8 cf2c4dd0 cf125730 cf2c4c00 c05d13c8 c05d2ba8 00000000 00000000 [    2.833637] 7ca0: 00000000 c03637fc 00000000 00000000 cf2c4c00 cf2c4dd0 00000000 c05d2ba8 [    2.841793] 7cc0: 00000000 c03692b4 00000000 00000000 cf20b490 c0838700 cf20b49c c08aa1dc [    2.849947] 7ce0: c083859c c036e8a4 00000001 00000001 00000000 c0581218 cf0d3000 c083859c [    2.858105] 7d00: cf0d3104 c0428668 cf0d3000 00000000 c08aa1d4 c034ac64 cf0d3190 00000000 [    2.866261] 7d20: cf887d58 c034ae18 00000000 00000000 cf15c010 00000000 c08aa1b0 c03491b0 [    2.874418] 7d40: cf9e4a90 cf081ac4 cf0d3000 cf0d3034 00000001 c034a96c cf0d3000 00000001 [    2.882574] 7d60: cf0d3000 cf0d3000 cf0d3000 c0840e40 00000000 c0349e80 cf0d3000 cf0d3008 [    2.890729] 7d80: c07db048 c0348304 cf0d3008 cf15c000 cf125fc0 c0840e40 cf15c1e0 cf260a16 [    2.898886] 7da0: cf15c000 cf15c000 cf15c000 00000000 c0840e40 cf15c1e0 c072d458 cf15c010 [    2.907042] 7dc0: 000001d4 c0428b00 006000c0 cf91eb90 cf91ea10 c042882c 574d4c13 cf0d3000 [    2.915198] 7de0: c08594c0 cf15c004 c05e6318 cf15ee10 cf91ea10 cf91ea00 00000000 00000000 [    2.923354] 7e00: 00000000 cf15ee88 c08594c0 c0427a1c 00000000 cf9140a0 cf15ee10 00000000 [    2.931510] 7e20: 00000000 cf91ea10 00000000 c0840a34 c0840a20 c0840a34 00000000 c034c8bc [    2.939667] 7e40: c034c870 cf91ea10 00000000 c08aa1d4 c08aa1dc c034ac64 cf91eba0 00000000 [    2.947822] 7e60: cf91ea10 c0840a34 cf91ea44 00000000 00000000 c07cc864 c0711df4 c034ade4 [    2.955979] 7e80: c0840a34 c034acfc cf91ea10 c0349244 cf83ce70 cf8fa5e0 c0840a34 cf206360 [    2.964133] 7ea0: c0837090 c034a0d4 c070505c c0840a34 00000006 c0840a34 00000006 c07db048 [    2.972290] 7ec0: c0850ac0 c034b96c c034c20c c07c1e78 00000006 c000aa88 00000001 00000001 [    2.980444] 7ee0: 00000000 00000000 00000000 00000000 c07e3d50 00000000 00000000 00000000 [    2.988602] 7f00: cfffcda7 00000000 0000009f 0000009f cfffcdae c003bbcc c07600a0 00000000 [    2.996757] 7f20: 00000006 00000006 cfffcdaa cfffcda7 00000000 c07cc838 00000006 cf260a16 [    3.004915] 7f40: c07cc83c 00000006 c07d5744 c0850aec 00000000 c0790fec 00000006 00000006 [    3.013069] 7f60: 00000000 c07905e0 00000000 0000009f 00000000 00000000 00000000 00000000 [    3.021225] 7f80: 00000000 00000000 c057ae78 00000000 00000000 00000000 00000000 00000000 [    3.029381] 7fa0: 00000000 c057ae80 00000000 c00090e8 00000000 00000000 00000000 00000000 [    3.037536] 7fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [    3.045693] 7fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000 [    3.053880] [<c02ec4ac>] (__list_add_valid) from [<c034dbf8>] (add_dr+0x38/0x58) [    3.061232] [<c034dbf8>] (add_dr) from [<c034e318>] (devres_add+0x28/0x38) [    3.068095] [<c034e318>] (devres_add) from [<c03629e4>] (regmap_attach_dev+0x44/0x64) [    3.075900] [<c03629e4>] (regmap_attach_dev) from [<c03634f4>] (__regmap_init+0xa10/0xc94) [    3.084139] [<c03634f4>] (__regmap_init) from [<c03637fc>] (__devm_regmap_init+0x84/0xc0) [    3.092302] [<c03637fc>] (__devm_regmap_init) from [<c03692b4>] (__devm_regmap_init_ac97+0x54/0x68) [    3.101325] [<c03692b4>] (__devm_regmap_init_ac97) from [<c036e8a4>] (wm97xx_ac97_probe+0xe0/0x170) [    3.110351] [<c036e8a4>] (wm97xx_ac97_probe) from [<c0428668>] (ac97_bus_probe+0x8c/0x128) [    3.118598] [<c0428668>] (ac97_bus_probe) from [<c034ac64>] (driver_probe_device+0x270/0x308) [    3.127093] [<c034ac64>] (driver_probe_device) from [<c03491b0>] (bus_for_each_drv+0x5c/0x88) [    3.135594] [<c03491b0>] (bus_for_each_drv) from [<c034a96c>] (__device_attach+0x9c/0xfc) [    3.143748] [<c034a96c>] (__device_attach) from [<c0349e80>] (bus_probe_device+0x84/0x8c) [    3.151904] [<c0349e80>] (bus_probe_device) from [<c0348304>] (device_add+0x32c/0x558) [    3.159803] [<c0348304>] (device_add) from [<c0428b00>] (snd_ac97_controller_register+0x228/0x2a8) [    3.168740] [<c0428b00>] (snd_ac97_controller_register) from [<c0427a1c>] (samsung_ac97_probe+0x19c/0x288) [    3.178366] [<c0427a1c>] (samsung_ac97_probe) from [<c034c8bc>] (platform_drv_probe+0x4c/0x9c) [    3.186959] [<c034c8bc>] (platform_drv_probe) from [<c034ac64>] (driver_probe_device+0x270/0x308) [    3.195811] [<c034ac64>] (driver_probe_device) from [<c034ade4>] (__driver_attach+0xe8/0xec) [    3.204224] [<c034ade4>] (__driver_attach) from [<c0349244>] (bus_for_each_dev+0x68/0x7c) [    3.212380] [<c0349244>] (bus_for_each_dev) from [<c034a0d4>] (bus_add_driver+0x164/0x1f4) [    3.220626] [<c034a0d4>] (bus_add_driver) from [<c034b96c>] (driver_register+0x7c/0x110) [    3.228697] [<c034b96c>] (driver_register) from [<c000aa88>] (do_one_initcall+0x54/0x254) [    3.236866] [<c000aa88>] (do_one_initcall) from [<c0790fec>] (kernel_init_freeable+0x260/0x340) [    3.245540] [<c0790fec>] (kernel_init_freeable) from [<c057ae80>] (kernel_init+0x8/0xf0) [    3.253598] [<c057ae80>] (kernel_init) from [<c00090e8>] (ret_from_fork+0x14/0x2c) [    3.261125] Exception stack(0xcf887fb0 to 0xcf887ff8) [    3.266164] 7fa0:                                     00000000 00000000 00000000 00000000 [    3.274324] 7fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [    3.282477] 7fe0: 00000000 00000000 00000000 00000000 00000013 00000000 [    3.289079] Code: e1a01003 e59f0010 e1a0300c ebf5be50 (e7f001f2) [    3.295163] ---[ end trace e28d0ebaa150deac ]---

Best Regard

Lihua