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authorJohannes Berg <johannes.berg@intel.com>2017-09-06 16:01:42 +0300
committerJohannes Berg <johannes.berg@intel.com>2017-09-06 16:22:02 +0300
commitbde59c475e0883e4c4294bcd9b9c7e08ae18c828 (patch)
tree2bc99ff875407d538dd1c6c8f2cced8878528ad9 /include/net
parent98e93e968e4947cd71c2eb69e323682daa453ee7 (diff)
downloadlinux-bde59c475e0883e4c4294bcd9b9c7e08ae18c828.tar.xz
mac80211: fix deadlock in driver-managed RX BA session start
When an RX BA session is started by the driver, and it has to tell mac80211 about it, the corresponding bit in tid_rx_manage_offl gets set and the BA session work is scheduled. Upon testing this bit, it will call __ieee80211_start_rx_ba_session(), thus deadlocking as it already holds the ampdu_mlme.mtx, which that acquires again. Fix this by adding ___ieee80211_start_rx_ba_session(), a version of the function that requires the mutex already held. Cc: stable@vger.kernel.org Fixes: 699cb58c8a52 ("mac80211: manage RX BA session offload without SKB queue") Reported-by: Matteo Croce <mcroce@redhat.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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