[SRU][Focal/Eoan/OEM-B-OSP1][PATCH 0/5] Fix hang issue if sof fails to load firmware

[Hui Wang]

BugLink: http://bugs.launchpad.net/bugs/1861837

If the sof driver fails to load the firmware, it doesn't release the
resource, then it make the system hang when suspending and resuming.

After this patchset is applied, please also apply the patchset we
just reverted 2 weeks ago, since this patchset is the fixing patches
for the patches we reverted (#1857409). If need me to resend the
reverted patches, I will resend them.


[Impact]
The machine hangs during suspend/resume if the sof driver fails to
load firmware.

[Fix]
This bug is fixed in the mainline kernel v5.6-rc1, now backported
those patches to ubuntu kernel

[Test Case]
sudo mv /lib/firmware/intel/sof /lib/firmware/intel/sof-bak, reboot
then suspend and resume, the system will not hang anymore

And if the sof driver load the firmware successfully, the audio
functions all worked well as before.

[Regression Risk]
Low, the patches are backported from upstream kernel, and I tested
these patches on Lenovo and Dell dmic machines.


Kai Vehmanen (2):
  ASoC: hdac_hda: Fix error in driver removal after failed probe
  ASoC: SOF: trace: fix unconditional free in trace release

Pierre-Louis Bossart (2):
  ASoC: SOF: core: free trace on errors
  ASoC: SOF: core: release resources on errors in probe_continue

Ranjani Sridharan (1):
  ASoC: SOF: Introduce state machine for FW boot

 sound/soc/codecs/hdac_hda.c          |  4 +-
 sound/soc/sof/core.c                 | 86 ++++++++++++++++++++--------
 sound/soc/sof/intel/hda-loader-skl.c |  1 -
 sound/soc/sof/intel/hda-loader.c     |  1 -
 sound/soc/sof/intel/hda.c            |  4 +-
 sound/soc/sof/ipc.c                  | 17 ++----
 sound/soc/sof/loader.c               | 19 ++++--
 sound/soc/sof/pm.c                   | 25 +++++++-
 sound/soc/sof/sof-priv.h             | 11 +++-
 sound/soc/sof/trace.c                |  7 ++-
 10 files changed, 125 insertions(+), 50 deletions(-)

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2.17.1