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authorKai Vehmanen <kai.vehmanen@linux.intel.com>2021-01-13 18:07:15 +0300
committerMark Brown <broonie@kernel.org>2021-01-13 19:33:40 +0300
commit9c25af250214e45f6d1c21ff6239a1ffeeedf20e (patch)
treec128ac1f2473b04801e2692a2e602c188f6bbec6 /sound
parentef4d764c99f792b725d4754a3628830f094f5c58 (diff)
downloadlinux-9c25af250214e45f6d1c21ff6239a1ffeeedf20e.tar.xz
ASoC: SOF: Intel: fix page fault at probe if i915 init fails
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: 6c63c954e1c5 ("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>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/sof/intel/hda-codec.c18
1 files changed, 9 insertions, 9 deletions
diff --git a/sound/soc/sof/intel/hda-codec.c b/sound/soc/sof/intel/hda-codec.c
index b7e9931ead57..6744318de612 100644
--- a/sound/soc/sof/intel/hda-codec.c
+++ b/sound/soc/sof/intel/hda-codec.c
@@ -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 */