The is to fix the kernel panic happens if user space inserts the mesh STA and not proceed with the SAE and AMPE, and later the same mesh STA is detected again. The sta_state of the mesh STA remains at IEEE80211_STA_NONE and if the ieee80211_sta_ps_deliver_wakeup is called and subsequently the ath_tx_aggr_wakeup, the kernel panic due to ath_tx_node_init is not called before to initialize the require data structures. This issue is reported by Cedric Voncken before. http://www.spinics.net/lists/linux-wireless/msg106342.html [<831ea6b4>] ath_tx_aggr_wakeup+0x44/0xcc [ath9k] [<83084214>] ieee80211_sta_ps_deliver_wakeup+0xb8/0x208 [mac80211] [<830b9824>] ieee80211_mps_sta_status_update+0x94/0x108 [mac80211] [<83099398>] ieee80211_sta_ps_transition+0xc94/0x34d8 [mac80211] [<8022399c>] nf_iterate+0x98/0x104 [<8309bb60>] ieee80211_sta_ps_transition+0x345c/0x34d8 [mac80211] Thomas Perdersen also mentioned that this patch has fixed the bad sta magic warning in mac80211_hwsim_set_tim() when applied to mac80211-next/master Signed-off-by: Chun-Yeow Yeoh <yeohchunyeow@xxxxxxxxx> --- net/mac80211/mesh_ps.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/net/mac80211/mesh_ps.c b/net/mac80211/mesh_ps.c index 3b7bfc0..0e42758 100644 --- a/net/mac80211/mesh_ps.c +++ b/net/mac80211/mesh_ps.c @@ -251,7 +251,8 @@ void ieee80211_mps_sta_status_update(struct sta_info *sta) mps_dbg(sta->sdata, "start PS buffering frames towards %pM\n", sta->sta.addr); } else { - ieee80211_sta_ps_deliver_wakeup(sta); + if (sta->sta_state >= IEEE80211_STA_ASSOC) + ieee80211_sta_ps_deliver_wakeup(sta); } /* clear the MPSP flags for non-peers or active STA */ -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
