mac80211: fix txq queue related crashes
The driver can access the queue simultanously while mac80211 tears down the interface. Without spinlock protection this could lead to corrupting sk_buff_head and subsequently to an invalid pointer dereference. Fixes: ba8c3d6f ("mac80211: add an intermediate software queue implementation") Signed-off-by: Michal Kazior <michal.kazior@tieto.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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