While tinkering with ACPI work-arounds for the HP Omen 16 support, we identified a corner case where the headset codec device properties are not set in the codec .init when -EPROBE_DEFER is returned, but released unconditionally in the .exit(). This leads to a kernel oops [ 4.186891] sof_sdw sof_sdw: snd_soc_register_card failed -517 [ 4.186896] BUG: kernel NULL pointer dereference, address: 00000000000003f0 [ 4.186914] Oops: 0000 [#1] PREEMPT SMP NOPTI [ 4.186926] RIP: 0010:dev_fwnode+0x5/0x20 [ 4.186974] device_remove_software_node+0x10/0x80 [ 4.186982] sof_sdw_rt711_exit+0x19/0x30 [snd_soc_sof_sdw] [ 4.186990] mc_dailink_exit_loop+0x94/0xc0 [snd_soc_sof_sdw] [ 4.186996] ? rt711_rtd_init+0x170/0x170 [snd_soc_sof_sdw] A similar error case can occur if the addition of the device property fails. We need to test if the property was successfully added before removing it. BugLink: https://github.com/thesofproject/linux/issues/3727 Fixes: 768ad6d80db2d ("ASoC: Intel: sof_sdw: handle errors on card registration") Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx> Reviewed-by: Ranjani Sridharan <ranjani.sridharan@xxxxxxxxxxxxxxx> Reviewed-by: Bard Liao <yung-chuan.liao@xxxxxxxxxxxxxxx> --- sound/soc/intel/boards/sof_sdw_rt711.c | 3 +++ sound/soc/intel/boards/sof_sdw_rt711_sdca.c | 3 +++ 2 files changed, 6 insertions(+) diff --git a/sound/soc/intel/boards/sof_sdw_rt711.c b/sound/soc/intel/boards/sof_sdw_rt711.c index 49ff0871e9e7..8291967f23f3 100644 --- a/sound/soc/intel/boards/sof_sdw_rt711.c +++ b/sound/soc/intel/boards/sof_sdw_rt711.c @@ -139,6 +139,9 @@ int sof_sdw_rt711_exit(struct snd_soc_card *card, struct snd_soc_dai_link *dai_l { struct mc_private *ctx = snd_soc_card_get_drvdata(card); + if (!ctx->headset_codec_dev) + return 0; + device_remove_software_node(ctx->headset_codec_dev); put_device(ctx->headset_codec_dev); diff --git a/sound/soc/intel/boards/sof_sdw_rt711_sdca.c b/sound/soc/intel/boards/sof_sdw_rt711_sdca.c index b3fc32bacfa8..7f16304d025b 100644 --- a/sound/soc/intel/boards/sof_sdw_rt711_sdca.c +++ b/sound/soc/intel/boards/sof_sdw_rt711_sdca.c @@ -140,6 +140,9 @@ int sof_sdw_rt711_sdca_exit(struct snd_soc_card *card, struct snd_soc_dai_link * { struct mc_private *ctx = snd_soc_card_get_drvdata(card); + if (!ctx->headset_codec_dev) + return 0; + device_remove_software_node(ctx->headset_codec_dev); put_device(ctx->headset_codec_dev); -- 2.34.1
