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The new_ctx pointer is set only for non-chanctx drivers. This yielded a crash for chanctx-based drivers during channel switch finalization: BUG: unable to handle kernel NULL pointer dereference at 0000000000000020 IP: ieee80211_vif_use_reserved_switch+0x71c/0xb00 [mac80211] Use an adequate chanctx pointer to fix this. Reported-by: Linus Torvalds <[email protected]> Signed-off-by: Michal Kazior <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>