fix(legacy-mcu1): backport Linux 7.3 cfg80211 support

Backport main commit 2c4ab4b421 to
legacy-mcu1, preserving the branch's MCU1 firmware and loader profile.
Adapt the probe status link ID, probe_peer callback and input cookie APIs;
retain cfg80211-assigned cookies through asynchronous completion paths.

Add an isolated native-kernel build check and record the regression results.
The original branch reproduces all six reported errors on 7.3-rc3. The fix
builds all three modules and passes MODPOST on upstream 7.3 final and Ubuntu
7.3-rc3, 7.2 and 6.17 headers. The final-release module_layout CRCs match
the fully built test kernel. Hardware operation has not been tested.

Refs #111

Co-authored-by: MastaG <badouri.g@gmail.com>

tests/kernel-build/.gitattributes

@@ -0,0 +1 @@
+*.sh text eol=lf

tests/kernel-build/README.md

@@ -0,0 +1,69 @@
+# Native kernel build regression
+
+Build the current driver against real, prepared kernel headers and symbol
+versions. The script cleans a temporary source copy, builds all three modules
+and leaves the results for inspection. It does not install or load them.
+
+```sh
+bash tests/kernel-build/build.sh /path/to/kernel/build CC=gcc-14
+```
+
+Set `JOBS` to choose parallelism and `TMPDIR` to an existing directory if
+build outputs need to survive system temporary-directory cleanup.
+
+Use the kernel's matching compiler and configuration. For a custom kernel,
+pass the exact output directory used to build it, including `O=...` when
+applicable. `make modules_prepare` alone does not generate `Module.symvers`;
+see the [external module build documentation](https://docs.kernel.org/kbuild/modules.html).
+
+For OpenWrt wireless backports, use the separate
+[backports build check](../openwrt-backports/README.md), which supplies the
+staged wireless headers, symbol versions and `CFG80211_VERSION` together.
+
+## Issue #111: Linux 7.3 on legacy-mcu1
+
+The `legacy-mcu1` branch was missing `main`'s Linux 7.3 compatibility commit
+[`2c4ab4b`](https://github.com/shenmintao/aic8800d80/commit/2c4ab4b421d6a780842deeef700f23ba9ecf7578).
+The backport adapts `cfg80211_probe_status()`'s link ID, the renamed
+`probe_peer` callback, and the input cookies for probe, management TX and
+remain-on-channel operations. Completion notifications retain the cookie
+assigned by cfg80211; internal TX/RoC callers keep their driver-assigned
+cookies. The existing MCU1 firmware and loader profile are unchanged.
+
+The original branch at `e074b7e` reproduces all six errors from the
+[issue's build log](https://github.com/shenmintao/aic8800d80/issues/111#issuecomment-6294321166)
+against Linux 7.3-rc3 headers: two probe-status argument errors, the renamed
+probe callback and its resulting initializer error, and incompatible
+management TX and remain-on-channel callback types.
+
+## Verified on 2026-10-21
+
+| Kernel/build headers | Fixed legacy-mcu1 result |
+| --- | --- |
+| Upstream Linux 7.3.0 final, x86_64 test configuration | All three modules built; MODPOST passed |
+| Ubuntu 7.3.0-070300rc3-generic headers | All three modules built; MODPOST passed |
+| Ubuntu 7.2.0-070200-generic headers | All three modules built; MODPOST passed |
+| Ubuntu 6.17.0-14-generic headers | All three modules built; MODPOST passed |
+
+The final-release check uses the upstream `linux-7.3.tar.xz` source, checked
+against kernel.org's SHA-256 manifest. The test kernel enables modules,
+symbol versioning, cfg80211, USB, Bluetooth and kprobes. Both `vmlinux` and
+the in-tree modules were built with GCC 14.2.0 to generate matching headers
+and `Module.symvers` before running this script. No symbol-version or
+MODPOST checks were bypassed. All three modules report `7.3.0` vermagic and
+the same `module_layout` CRC as that kernel's `Module.symvers`.
+
+The Ubuntu header checks also use GCC 14.2.0. The 7.2 and 7.3-rc3 headers
+were generated with GCC 15 and produce compiler/attribute warnings; BTF
+generation is skipped where a matching `vmlinux` is unavailable. The rc3
+`cfg80211.h` is byte-identical to the
+[upstream 7.3 final header](https://github.com/torvalds/linux/blob/v7.3/include/net/cfg80211.h).
+
+These checks cover compilation and symbol resolution. They do not test the
+reporter's custom `7.3.0-lxpup64` configuration, module loading, firmware
+startup, Wi-Fi traffic or Bluetooth operation on hardware.
+
+After a successful build, install only the newly built modules against the
+same kernel. Chain build and installation with `&&` so a failed build cannot
+lead to an attempt to install stale modules. MCU1 hardware should continue
+using `legacy-mcu1`.

tests/kernel-build/build.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+# Build a source copy against a prepared native kernel; never install or load it.
+set -euo pipefail
+
+if [ "$#" -lt 1 ]; then
+    echo "Usage: $0 KERNEL_BUILD_DIR [make arguments...]" >&2
+    exit 2
+fi
+
+kernel_dir=$(realpath "$1")
+shift
+
+for required in "$kernel_dir/Makefile" "$kernel_dir/Module.symvers" \
+    "$kernel_dir/include/generated/autoconf.h"; do
+    if [ ! -s "$required" ]; then
+        echo "Missing build input: $required" >&2
+        exit 2
+    fi
+done
+
+repo_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)
+build_dir=$(mktemp -d "${TMPDIR:-/tmp}/aic8800-kernel-build.XXXXXX")
+cp -a "$repo_dir/drivers/aic8800/." "$build_dir/"
+echo "Build directory: $build_dir"
+
+# Discard copied build outputs so stale modules cannot satisfy the check.
+make -C "$kernel_dir" M="$build_dir" "$@" clean
+make -C "$kernel_dir" M="$build_dir" -j"${JOBS:-2}" "$@" modules
+
+for module in aic_load_fw/aic_load_fw.ko aic8800_fdrv/aic8800_fdrv.ko \
+    aic_zlp_quirk/aic_zlp_quirk.ko; do
+    test -s "$build_dir/$module"
+done
+
+echo "All three modules built successfully in $build_dir"