mac80211: introduce plink lock for plink fields
The mesh plink code uses sta->lock to serialize access to the plink state fields between the peer link state machine and the peer link timer. Some paths (e.g. those involving mps_qos_null_tx()) unfortunately hold this spinlock across frame tx, which is soon to be disallowed. Add a new spinlock just for plink access. Signed-off-by: NBob Copeland <me@bobcopeland.com> Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
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