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1918787705
commit 9c25af250214e45f6d1c21ff6239a1ffeeedf20e upstream.
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:
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||
|---|---|---|
| .. | ||
| imx | ||
| intel | ||
| xtensa | ||
| compress.c | ||
| compress.h | ||
| control.c | ||
| core.c | ||
| debug.c | ||
| ipc.c | ||
| Kconfig | ||
| loader.c | ||
| Makefile | ||
| nocodec.c | ||
| ops.c | ||
| ops.h | ||
| pcm.c | ||
| pm.c | ||
| probe.c | ||
| probe.h | ||
| sof-acpi-dev.c | ||
| sof-audio.c | ||
| sof-audio.h | ||
| sof-of-dev.c | ||
| sof-pci-dev.c | ||
| sof-priv.h | ||
| topology.c | ||
| trace.c | ||
| utils.c | ||