ACK: [SRU][Resolute][PATCH v2 0/2] iwlwifi failed to handle oversized command 0xC05

[Jian Hui Lee]

Acked-by: Jian Hui Lee <jianhui.lee at canonical.com>

On Tue, Jun 23, 2026 at 1:05 PM You-Sheng Yang via kernel-team
<kernel-team at lists.ubuntu.com> wrote:
>
> BugLink: https://bugs.launchpad.net/bugs/2152688
>
> [Impact]
>
> With Intel AX211 wireless module installed on Intel Wildcat Lake
> platform, kernel warning with following errors are found at loading
> iwlwifi driver:
> ```
> kernel: iwlwifi 0000:00:14.3: Error sending UNKNOWN: enqueue_hcmd failed: -22
> kernel: iwlwifi 0000:00:14.3: failed to send MCC_ALLOWED_AP_TYPE_CMD (-22)
> ```
>
> This are found in mainline kernels 7.0+ as they are the kernel versions
> for WCL support, as well as backport-iwlwifi core102, 103, 104 and 105.
> backport-iwlwifi master branch HEAD has been partially patched, but
> incomplete.
>
> [Fix]
>
> For backport-iwlwifi-dkms, in the master branch HEAD it has commit
> 5a3d01a7ea635 ("[BUGFIX] wifi: iwlwifi: mvm: avoid oversized UATS command
> copy"), which is incomplete that Intel gives an additional patch titled
> "wifi: iwlwifi: mvm: don't map the stack to DMA". These two patches
> combined equal to
> https://git.kernel.org/pub/scm/linux/kernel/git/iwlwifi/iwlwifi-next.git/commit/?h=fixes&id=e0c121d545134af886b28c4c26d91abf5dd39c17
> ("wifi: iwlwifi: mvm: avoid oversized UATS command copy"). However the
> later breaks builds against kernel < 7.0 and therefore it takes
> additional backport related to kmalloc_obj family from commit
> 4862faa9c3dd ("Merge remote-tracking branch 'auto/master'"). Later, it's
> found to cause another PHC register failure warning on kernels >= 7.0,
> and it takes backports related to settime64 from another commit
> 5076fafb8e33 ("Merge remote-tracking branch 'auto/master'").
>
> For the linux kernel in-tree iwlwifi driver, Intel proposed a fix
> https://git.kernel.org/pub/scm/linux/kernel/git/iwlwifi/iwlwifi-next.git/commit/?h=fixes&id=e0c121d545134af886b28c4c26d91abf5dd39c17
> ("wifi: iwlwifi: mvm: avoid oversized UATS command copy") that is already
> in mainline kernel. While v7.0 has already commit 81d90d93d22ca ("wifi:
> iwlwifi: Implement settime64 as stub for MVM/MLD PTP") that fixes the PHC
> register problem, no additional fix is needed.
>
> [Test Plan]
>
> There are 4 cases:
>
> * linux-unstable-7.1/stonking
> * linux-generic-7.0/resolute
> * linux-oem-7.0/resolute
> * backport-iwlwifi-dkms/stoking
>   - tested against linux-unstable-7.1/stonking
> * backport-iwlwifi-dkms/resolute
>   - tested against linux-generic-7.0/resolute, linux-oem-7.0/resolute and
>     linux-oem-6.17/noble
>
> To test kernel packages:
>
> 1. Install kernels from corresponding -proposed pocket.
>
> 2. Boot from some Intel Wildcat Lake platforms with an Intel AX211
>    wireless module installed. Here I use Intel WCL-U RVP.
>
> 3. The dmesg should gives no error but probe iwlwifi kernel module
>    successfully.
>
> To test backport-iwlwifi-dkms packages:
>
> 1. Boot the testing kernel from some Intel Wildcat Lake platforms with an
>    Intel AX211 wireless module installed. Here I use Intel WCL-U RVP.
>
> 2. Install kernels from corresponding -proposed pocket.
>
> 3. The corresponding kernel modules should be built automatically by dpkg
>    triggers. Use `dkms status` to list built kernel versions.
>
> 4. Reboot into the same kernel. The dmesg should gives no error but probe
>    iwlwifi kernel module successfully.
>
> [Where problems could occur]
>
> This changes the way that command object is handled using
> IWL_HCMD_DFL_NOCOPY to avoid buffer size checking. It doesn't really
> change runtime behavior or anything else.
>
> [Other Info]
>
> The patches for backport-iwlwifi-dkms are meant to be superseded by the
> ones in the master branch, so I did not cherry-pick the one from
> linux-next instead.
>
> Nominate backport-iwlwifi-dkms Resolute and Stonking, because they are
> the versions with WCL support.
>
> Nominate linux/{Q,R}, linux-oem-7.0, linux-oem-6.17, because they are
> either 7.0 kernels or uses backport-iwlwifi-dkms/R.
>
> V2:
> - missed the iwl_mcc_allowed_ap_type_cmd v2 for Resolute
> - Stonking has this after rebased to mainline HEAD
>
> Emmanuel Grumbach (2):
>   wifi: iwlwifi: mld: add support for iwl_mcc_allowed_ap_type_cmd v2
>   wifi: iwlwifi: mvm: avoid oversized UATS command copy
>
>  .../wireless/intel/iwlwifi/fw/api/nvm-reg.h   | 14 ++++++-
>  .../net/wireless/intel/iwlwifi/fw/runtime.h   |  8 ++--
>  drivers/net/wireless/intel/iwlwifi/fw/uefi.c  | 36 ++++++++++++++--
>  drivers/net/wireless/intel/iwlwifi/fw/uefi.h  | 11 +++++
>  drivers/net/wireless/intel/iwlwifi/mld/fw.c   |  2 +-
>  .../wireless/intel/iwlwifi/mld/regulatory.c   | 32 +++++++++++---
>  .../wireless/intel/iwlwifi/mld/regulatory.h   |  2 +-
>  drivers/net/wireless/intel/iwlwifi/mvm/fw.c   | 42 +++++++++++++------
>  8 files changed, 119 insertions(+), 28 deletions(-)
>
> --
> 2.53.0
>
>
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