[Bug 1962704] Re: iwlwifi: Unknown symbol iwl_mei_is_connected

[Dimitri John Ledkov]

** Changed in: backport-iwlwifi-dkms (Ubuntu Jammy)
       Status: In Progress => Fix Committed

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Title:
  iwlwifi: Unknown symbol iwl_mei_is_connected

Status in backport-iwlwifi-dkms package in Ubuntu:
  Fix Committed
Status in backport-iwlwifi-dkms source package in Focal:
  In Progress
Status in backport-iwlwifi-dkms source package in Impish:
  In Progress
Status in backport-iwlwifi-dkms source package in Jammy:
  Fix Committed

Bug description:
  [SRU Justification]

  [Impact]

  backport-iwlwifi-dkms has a few problems to prevent it from loading
  either kernel modules itself or the runtime firmware correctly.

  The first issue is "unknown symbol iwl_mei_is_connected" error at
  module probing. This affects revsions >= 9241 where iwlmei module was
  first introduced in commit 71e53a8aae59 ("mirror: multi-input
  commit"). This can be addressed by cherry picking commit cc7d59edeeae
  ("[BUGFIX][NOUPSTREAM] iwlwifi: bump min kernel version for iwlmei")
  of rev 9255 that bumps iwlmei prerequisite kernel version to 5.14, and
  commit 87dce6e9817a ("[BUGFIX][NOUPSTREAM] iwlwifi: iwlmei isn't going
  to be merged anytime soon") of rev 9543 that bumps to 5.20. Therefore
  this affects Impish & Jammy that currently have 9340.

  The second problem is that even we addressed 9340 with aforementioned
  fix backported, the iwlwifi module may still fail to load firmware
  that is known fixed in at least 9580 that is being proposed. This
  would affects Focal oem-5.14 as well.

  [Fix]

  Bump to 9580 that fixes both issues stated above.

  [Test Case]

  Compile and run against Focal oem-5.14/hwe-5.13/hwe-5.15 kernels, as
  well as Impish 5.13 and Jammy 5.15.

  [Where problems could occur]

  While the revision number represents the commits since the git root
  commit of backport-iwlwifi, this is going to back port more than a
  thousand commits for Focal (8324 -> 9580) and 240 ones for
  Impish/Jammy (9340 -> 9580), there can always be issue like we have
  here now or later for kernels of a more recent version. While this
  package is to enable people running legacy kernels to be able to enjoy
  their new toys, new hardware support and bug fixes shall be backported
  as long as needed to justify its name "backport-iwlwifi-dkms" here.

  ========== original bug report ==========

  Since backport-iwlwifi version 9241[1], a new module iwlmei was
  introduced but not yet included in the dkms.conf installed. This fails
  the kernel module loading with:

    iwlwifi: Unknown symbol iwl_mei_is_connected (err -2)

  [1]: https://git.kernel.org/pub/scm/linux/kernel/git/iwlwifi/backport-
  iwlwifi.git/commit/?id=71e53a8aae592d02972522561eac899311ea9319

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