From 8a61af65c6d03781015315dbc43d0942a5b31db9 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Thu, 13 Dec 2012 17:42:30 +0100 Subject: [PATCH] mac80211: fix channel context iteration During suspend/resume channel contexts might be iterated even if they haven't been re-added to the driver, keep track of this and skip them in iteration. Also use the new status for sanity checks. Also clarify the fact that during HW restart all contexts are iterated over (thanks Eliad.) Signed-off-by: Johannes Berg --- include/net/mac80211.h | 5 +++++ net/mac80211/chan.c | 3 ++- net/mac80211/driver-ops.h | 15 ++++++++++++--- net/mac80211/ieee80211_i.h | 1 + 4 files changed, 20 insertions(+), 4 deletions(-) diff --git a/include/net/mac80211.h b/include/net/mac80211.h index ee50c5eba50c..0978b0faa880 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -3754,6 +3754,11 @@ void ieee80211_iter_keys(struct ieee80211_hw *hw, * The iterator will not find a context that's being added (during * the driver callback to add it) but will find it while it's being * removed. + * + * Note that during hardware restart, all contexts that existed + * before the restart are considered already present so will be + * found while iterating, whether they've been re-added already + * or not. */ void ieee80211_iter_chan_contexts_atomic( struct ieee80211_hw *hw, diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c index 80e55527504b..1bfe0a8b19d2 100644 --- a/net/mac80211/chan.c +++ b/net/mac80211/chan.c @@ -381,7 +381,8 @@ void ieee80211_iter_chan_contexts_atomic( rcu_read_lock(); list_for_each_entry_rcu(ctx, &local->chanctx_list, list) - iter(hw, &ctx->conf, iter_data); + if (ctx->driver_present) + iter(hw, &ctx->conf, iter_data); rcu_read_unlock(); } EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic); diff --git a/net/mac80211/driver-ops.h b/net/mac80211/driver-ops.h index 698dc7e6f309..608ced41548d 100644 --- a/net/mac80211/driver-ops.h +++ b/net/mac80211/driver-ops.h @@ -913,6 +913,8 @@ static inline int drv_add_chanctx(struct ieee80211_local *local, if (local->ops->add_chanctx) ret = local->ops->add_chanctx(&local->hw, &ctx->conf); trace_drv_return_int(local, ret); + if (!ret) + ctx->driver_present = true; return ret; } @@ -924,6 +926,7 @@ static inline void drv_remove_chanctx(struct ieee80211_local *local, if (local->ops->remove_chanctx) local->ops->remove_chanctx(&local->hw, &ctx->conf); trace_drv_return_void(local); + ctx->driver_present = false; } static inline void drv_change_chanctx(struct ieee80211_local *local, @@ -931,8 +934,10 @@ static inline void drv_change_chanctx(struct ieee80211_local *local, u32 changed) { trace_drv_change_chanctx(local, ctx, changed); - if (local->ops->change_chanctx) + if (local->ops->change_chanctx) { + WARN_ON_ONCE(!ctx->driver_present); local->ops->change_chanctx(&local->hw, &ctx->conf, changed); + } trace_drv_return_void(local); } @@ -945,10 +950,12 @@ static inline int drv_assign_vif_chanctx(struct ieee80211_local *local, check_sdata_in_driver(sdata); trace_drv_assign_vif_chanctx(local, sdata, ctx); - if (local->ops->assign_vif_chanctx) + if (local->ops->assign_vif_chanctx) { + WARN_ON_ONCE(!ctx->driver_present); ret = local->ops->assign_vif_chanctx(&local->hw, &sdata->vif, &ctx->conf); + } trace_drv_return_int(local, ret); return ret; @@ -961,10 +968,12 @@ static inline void drv_unassign_vif_chanctx(struct ieee80211_local *local, check_sdata_in_driver(sdata); trace_drv_unassign_vif_chanctx(local, sdata, ctx); - if (local->ops->unassign_vif_chanctx) + if (local->ops->unassign_vif_chanctx) { + WARN_ON_ONCE(!ctx->driver_present); local->ops->unassign_vif_chanctx(&local->hw, &sdata->vif, &ctx->conf); + } trace_drv_return_void(local); } diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index 38e7883cff23..23161189b173 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -685,6 +685,7 @@ struct ieee80211_chanctx { enum ieee80211_chanctx_mode mode; int refcount; + bool driver_present; struct ieee80211_chanctx_conf conf; }; -- 2.20.1