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Without this, if there was an AP and STA on the same radio and the STA received a CSA a lot of kernel warnings would be emitted: Thu Nov 20 03:59:40 2025 kern.warn kernel: [ 902.810941] WARNING: CPU: 0 PID: 0 at /home/james.haggerty/a/morse_openwrt_23/build_dir/target-mipsel-openwrt-linux-musl_musl/linux-ramips_mt7621/backports-6.1.145-1/net/mac80211/tx.c:5133 ieee80211_beacon_cntdwn_is_complete+0xdc/0x150 [mac80211] ... Thu Nov 20 03:59:40 2025 kern.warn kernel: [ 902.811725] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 5.15.189 #0 Thu Nov 20 03:59:40 2025 kern.warn kernel: [ 902.811740] Stack : 00000000 80084018 00000000 00000004 00000000 00000000 8140dd04 80a40000 Thu Nov 20 03:59:40 2025 kern.warn kernel: [ 902.811789] 80880000 807a587c 8087d318 8087ce03 00000000 00000001 8140dcb0 81456e40 Thu Nov 20 03:59:40 2025 kern.warn kernel: [ 902.811840] 00000000 00000000 807a587c 8140db50 c0000873 00000000 ffffffea 00000000 Thu Nov 20 03:59:40 2025 kern.warn kernel: [ 902.811889] 8140db5c 00000873 80882960 20202020 807a587c 00000000 00000000 82e39220 Thu Nov 20 03:59:40 2025 kern.warn kernel: [ 902.811939] 00000009 82ca0dc0 00000001 00000002 00000008 00000020 00000000 80a40000 Thu Nov 20 03:59:40 2025 kern.warn kernel: [ 902.811987] ... Thu Nov 20 03:59:40 2025 kern.warn kernel: [ 902.812001] Call Trace: Thu Nov 20 03:59:40 2025 kern.warn kernel: [ 902.812006] [<80007f24>] show_stack+0x28/0xf0 Thu Nov 20 03:59:40 2025 kern.warn kernel: [ 902.812029] [<80383db0>] dump_stack_lvl+0x60/0x80 Thu Nov 20 03:59:40 2025 kern.warn kernel: [ 902.812046] [<8002df88>] __warn+0x9c/0x124 Thu Nov 20 03:59:40 2025 kern.warn kernel: [ 902.812066] [<8002e06c>] warn_slowpath_fmt+0x5c/0xac Thu Nov 20 03:59:40 2025 kern.warn kernel: [ 902.812093] [<82e39220>] ieee80211_beacon_cntdwn_is_complete+0xdc/0x150 [mac80211] Thu Nov 20 03:59:40 2025 kern.warn kernel: [ 902.812257] [<82c944f8>] mt76_csa_finish+0xc0/0x268 [mt76]
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Without this, if there was an AP and STA on the same radio and the STA received a CSA a lot of kernel warnings would be emitted:
This is very similar to the code in 4da6277