From fe5f255930af02ef3c3e0d00545b674e7e9d0cfb Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Mon, 19 Nov 2012 22:19:08 +0100 Subject: [PATCH] mac80211: fix channel context suspend/reconfig handling Sujith reported warnings with suspend/resume due to channel contexts. When I looked into it, I realised that the code was completely broken as it unassigned the channel contexts when suspending, which actually means they are destroyed. Eliad Peller then pointed out that we also need to remove the channel contexts from the driver. When I looked into this, I also noticed that the code isn't handling the virtual monitor interface correctly (if it exists.) Fix this by calling just the driver methods (if they are implemented) instead of using the channel context management code. Also add reconfiguration for the virtual monitor interface. Reported-by: Sujith Manoharan Signed-off-by: Johannes Berg --- net/mac80211/pm.c | 44 +++++++++++++++++++++++++++++++++++++++++--- net/mac80211/util.c | 15 +++++++++++++++ 2 files changed, 56 insertions(+), 3 deletions(-) diff --git a/net/mac80211/pm.c b/net/mac80211/pm.c index 0f1c434638bc..79a48f37d409 100644 --- a/net/mac80211/pm.c +++ b/net/mac80211/pm.c @@ -33,6 +33,7 @@ int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan) struct ieee80211_local *local = hw_to_local(hw); struct ieee80211_sub_if_data *sdata; struct sta_info *sta; + struct ieee80211_chanctx *ctx; if (!local->open_count) goto suspend; @@ -139,14 +140,51 @@ int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan) rcu_access_pointer(sdata->u.ap.beacon)) drv_stop_ap(local, sdata); - /* the interface is leaving the channel and is removed */ - ieee80211_vif_release_channel(sdata); + if (local->use_chanctx) { + struct ieee80211_chanctx_conf *conf; + + mutex_lock(&local->chanctx_mtx); + conf = rcu_dereference_protected( + sdata->vif.chanctx_conf, + lockdep_is_held(&local->chanctx_mtx)); + if (conf) { + ctx = container_of(conf, + struct ieee80211_chanctx, + conf); + drv_unassign_vif_chanctx(local, sdata, ctx); + } + + mutex_unlock(&local->chanctx_mtx); + } drv_remove_interface(local, sdata); } sdata = rtnl_dereference(local->monitor_sdata); - if (sdata) + if (sdata) { + if (local->use_chanctx) { + struct ieee80211_chanctx_conf *conf; + + mutex_lock(&local->chanctx_mtx); + conf = rcu_dereference_protected( + sdata->vif.chanctx_conf, + lockdep_is_held(&local->chanctx_mtx)); + if (conf) { + ctx = container_of(conf, + struct ieee80211_chanctx, + conf); + drv_unassign_vif_chanctx(local, sdata, ctx); + } + + mutex_unlock(&local->chanctx_mtx); + } + drv_remove_interface(local, sdata); + } + + mutex_lock(&local->chanctx_mtx); + list_for_each_entry(ctx, &local->chanctx_list, list) + drv_remove_chanctx(local, ctx); + mutex_unlock(&local->chanctx_mtx); /* stop hardware - this must stop RX */ if (local->open_count) diff --git a/net/mac80211/util.c b/net/mac80211/util.c index 7fb55bf6561e..2f08a7e09b7e 100644 --- a/net/mac80211/util.c +++ b/net/mac80211/util.c @@ -1441,6 +1441,21 @@ int ieee80211_reconfig(struct ieee80211_local *local) mutex_unlock(&local->chanctx_mtx); } + sdata = rtnl_dereference(local->monitor_sdata); + if (sdata && local->use_chanctx && ieee80211_sdata_running(sdata)) { + struct ieee80211_chanctx_conf *ctx_conf; + + mutex_lock(&local->chanctx_mtx); + ctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf, + lockdep_is_held(&local->chanctx_mtx)); + if (ctx_conf) { + ctx = container_of(ctx_conf, struct ieee80211_chanctx, + conf); + drv_assign_vif_chanctx(local, sdata, ctx); + } + mutex_unlock(&local->chanctx_mtx); + } + /* add STAs back */ mutex_lock(&local->sta_mtx); list_for_each_entry(sta, &local->sta_list, list) { -- 2.20.1