[PATCH 2/6] ASoC: mediatek: mt8195: Set ETDM1/2 IN/OUT to COMP_DUMMY()

[Julien Massot]

ETDM2_IN_BE and ETDM1_OUT_BE are defined as COMP_EMPTY(),
in the case the codec dai_name will be null.

Avoid a crash if the device tree is not assigning a codec
to these links.

[    1.179936] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
[    1.181065] Mem abort info:
[    1.181420]   ESR = 0x0000000096000004
[    1.181892]   EC = 0x25: DABT (current EL), IL = 32 bits
[    1.182576]   SET = 0, FnV = 0
[    1.182964]   EA = 0, S1PTW = 0
[    1.183367]   FSC = 0x04: level 0 translation fault
[    1.183983] Data abort info:
[    1.184406]   ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
[    1.185097]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
[    1.185766]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[    1.186439] [0000000000000000] user address but active_mm is swapper
[    1.187239] Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
[    1.188029] Modules linked in:
[    1.188420] CPU: 7 UID: 0 PID: 70 Comm: kworker/u32:1 Not tainted 6.14.0-rc4-next-20250226+ #85
[    1.189515] Hardware name: Radxa NIO 12L (DT)
[    1.190065] Workqueue: events_unbound deferred_probe_work_func
[    1.190808] pstate: 40400009 (nZcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[    1.191683] pc : __pi_strcmp+0x24/0x140
[    1.192170] lr : mt8195_mt6359_soc_card_probe+0x224/0x7b0
[    1.192854] sp : ffff800083473970
[    1.193271] x29: ffff800083473a10 x28: 0000000000001008 x27: 0000000000000002
[    1.194168] x26: ffff800082408960 x25: ffff800082417db0 x24: ffff800082417d88
[    1.195065] x23: 000000000000001e x22: ffff800082dbf480 x21: ffff800082dc07b8
[    1.195961] x20: 0000000000000000 x19: 0000000000000013 x18: 00000000ffffffff
[    1.196858] x17: 000000040044ffff x16: 005000f2b5503510 x15: 0000000000000006
[    1.197755] x14: ffff800082407af0 x13: 6e6f69737265766e x12: 692d6b636f6c6374
[    1.198651] x11: 0000000000000002 x10: ffff80008240b920 x9 : 0000000000000018
[    1.199547] x8 : 0101010101010101 x7 : 0000000000000000 x6 : 0000000000000000
[    1.200443] x5 : 0000000000000000 x4 : 8080808080000000 x3 : 303933383978616d
[    1.201339] x2 : 0000000000000000 x1 : ffff80008240b920 x0 : 0000000000000000
[    1.202236] Call trace:
[    1.202545]  __pi_strcmp+0x24/0x140 (P)
[    1.203029]  mtk_soundcard_common_probe+0x3bc/0x5b8
[    1.203644]  platform_probe+0x70/0xe8
[    1.204106]  really_probe+0xc8/0x3a0
[    1.204556]  __driver_probe_device+0x84/0x160
[    1.205104]  driver_probe_device+0x44/0x130
[    1.205630]  __device_attach_driver+0xc4/0x170
[    1.206189]  bus_for_each_drv+0x8c/0xf8
[    1.206672]  __device_attach+0xa8/0x1c8
[    1.207155]  device_initial_probe+0x1c/0x30
[    1.207681]  bus_probe_device+0xb0/0xc0
[    1.208165]  deferred_probe_work_func+0xa4/0x100
[    1.208747]  process_one_work+0x158/0x3e0
[    1.209254]  worker_thread+0x2c4/0x3e8
[    1.209727]  kthread+0x134/0x1f0
[    1.210136]  ret_from_fork+0x10/0x20
[    1.210589] Code: 54000401 b50002c6 d503201f f86a6803 (f8408402)
[    1.211355] ---[ end trace 0000000000000000 ]---

Signed-off-by: Julien Massot <julien.massot at collabora.com>
Fixes: e70b8dd26711 ("ASoC: mediatek: mt8195: Remove afe-dai component and rework codec link")
---
 sound/soc/mediatek/mt8195/mt8195-mt6359.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/soc/mediatek/mt8195/mt8195-mt6359.c b/sound/soc/mediatek/mt8195/mt8195-mt6359.c
index f0bb59cf581b1e3bcfa66406d31de446a917c6c6..a370b8af8c282bbcafce82561312e24c515beea5 100644
--- a/sound/soc/mediatek/mt8195/mt8195-mt6359.c
+++ b/sound/soc/mediatek/mt8195/mt8195-mt6359.c
@@ -831,12 +831,12 @@ SND_SOC_DAILINK_DEFS(ETDM1_IN_BE,
 
 SND_SOC_DAILINK_DEFS(ETDM2_IN_BE,
 		     DAILINK_COMP_ARRAY(COMP_CPU("ETDM2_IN")),
-		     DAILINK_COMP_ARRAY(COMP_EMPTY()),
+		     DAILINK_COMP_ARRAY(COMP_DUMMY()),
 		     DAILINK_COMP_ARRAY(COMP_EMPTY()));
 
 SND_SOC_DAILINK_DEFS(ETDM1_OUT_BE,
 		     DAILINK_COMP_ARRAY(COMP_CPU("ETDM1_OUT")),
-		     DAILINK_COMP_ARRAY(COMP_EMPTY()),
+		     DAILINK_COMP_ARRAY(COMP_DUMMY()),
 		     DAILINK_COMP_ARRAY(COMP_EMPTY()));
 
 SND_SOC_DAILINK_DEFS(ETDM2_OUT_BE,

-- 
2.49.0