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ASoC: SOF: Intel: fix page fault at probe if i915 init fails

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The earlier commit to fix runtime PM in case i915 init fails,
introduces a possibility to hit a page fault.

snd_hdac_ext_bus_device_exit() is designed to be called from
dev.release(). Calling it outside device reference counting, is
not safe and may lead to calling the device_exit() function
twice. Additionally, as part of ext_bus_device_init(), the device
is also registered with snd_hdac_device_register(). Thus before
calling device_exit(), the device must be removed from device
hierarchy first.

Fix the issue by rolling back init actions by calling
hdac_device_unregister() and then releasing device with put_device().
This matches with existing code in hdac-ext module.

To complete the fix, add handling for the case where
hda_codec_load_module() returns -ENODEV, and clean up the hdac_ext
resources also in this case.

In future work, hdac-ext interface should be extended to allow clients
more flexibility to handle the life-cycle of individual devices, beyond
just the current snd_hdac_ext_bus_device_remove(), which removes all
devices.

BugLink: https://github.com/thesofproject/linux/issues/2646
Reported-by: Jaroslav Kysela <perex@perex.cz>
Fixes: 6c63c954e1 ("ASoC: SOF: fix a runtime pm issue in SOF when HDMI codec doesn't work")
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Libin Yang <libin.yang@intel.com>
Reviewed-by: Bard Liao <bard.liao@intel.com>
Link: https://lore.kernel.org/r/20210113150715.3992635-1-kai.vehmanen@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Kai Vehmanen 2021-01-13 17:07:15 +02:00 committed by Mark Brown
parent ef4d764c99
commit 9c25af2502
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 9 additions and 9 deletions
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18
sound/soc/sof/intel/hda-codec.c
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@ -153,7 +153,8 @@ static int hda_codec_probe(struct snd_sof_dev *sdev, int address,
if (!hdev->bus->audio_component) {
dev_dbg(sdev->dev,
"iDisp hw present but no driver\n");
goto error;
ret = -ENOENT;
goto out;
}
hda_priv->need_display_power = true;
}
@ -170,24 +171,23 @@ static int hda_codec_probe(struct snd_sof_dev *sdev, int address,
* other return codes without modification
*/
if (ret == 0)
goto error;
ret = -ENOENT;
}
return ret;
error:
snd_hdac_ext_bus_device_exit(hdev);
return -ENOENT;
out:
if (ret < 0) {
snd_hdac_device_unregister(hdev);
put_device(&hdev->dev);
}
#else
hdev = devm_kzalloc(sdev->dev, sizeof(*hdev), GFP_KERNEL);
if (!hdev)
return -ENOMEM;
ret = snd_hdac_ext_bus_device_init(&hbus->core, address, hdev, HDA_DEV_ASOC);
#endif
return ret;
#endif
}
/* Codec initialization */