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mac80211: track reserved vifs in chanctx

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This can be useful. Provides a more straghtforward
way to iterate over interfaces taking part in
chanctx reservation and allows tracking chanctx
usage explicitly.

The structure is protected by local->chanctx_mtx.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Michal Kazior 2014-04-09 15:29:27 +02:00 committed by Johannes Berg
parent 484298ad1a
commit e3afb92022
3 changed files with 13 additions and 4 deletions
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14
net/mac80211/chan.c
View File

@ -277,6 +277,7 @@ ieee80211_new_chanctx(struct ieee80211_local *local,
return ERR_PTR(-ENOMEM);
INIT_LIST_HEAD(&ctx->assigned_vifs);
INIT_LIST_HEAD(&ctx->reserved_vifs);
ctx->conf.def = *chandef;
ctx->conf.rx_chains_static = 1;
ctx->conf.rx_chains_dynamic = 1;
@ -731,16 +732,19 @@ void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_chanctx *ctx = sdata->reserved_chanctx;
lockdep_assert_held(&sdata->local->chanctx_mtx);
if (WARN_ON(!sdata->reserved_chanctx))
if (WARN_ON(!ctx))
return -EINVAL;
if (--sdata->reserved_chanctx->refcount == 0)
ieee80211_free_chanctx(sdata->local, sdata->reserved_chanctx);
list_del(&sdata->reserved_chanctx_list);
sdata->reserved_chanctx = NULL;
if (--ctx->refcount == 0)
ieee80211_free_chanctx(sdata->local, ctx);
return 0;
}
@ -788,6 +792,7 @@ int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
}
}
list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs);
new_ctx->refcount++;
sdata->reserved_chanctx = new_ctx;
sdata->reserved_chandef = *chandef;
@ -837,6 +842,7 @@ int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata,
ctx->refcount--;
sdata->reserved_chanctx = NULL;
sdata->radar_required = sdata->reserved_radar_required;
list_del(&sdata->reserved_chanctx_list);
if (old_ctx == ctx) {
/* This is our own context, just change it */

2
net/mac80211/ieee80211_i.h
View File

@ -692,6 +692,7 @@ struct ieee80211_chanctx {
struct rcu_head rcu_head;
struct list_head assigned_vifs;
struct list_head reserved_vifs;
enum ieee80211_chanctx_mode mode;
int refcount;
@ -759,6 +760,7 @@ struct ieee80211_sub_if_data {
struct cfg80211_chan_def csa_chandef;
struct list_head assigned_chanctx_list; /* protected by chanctx_mtx */
struct list_head reserved_chanctx_list; /* protected by chanctx_mtx */
/* context reservation -- protected with chanctx_mtx */
struct ieee80211_chanctx *reserved_chanctx;

1
net/mac80211/iface.c
View File

@ -1292,6 +1292,7 @@ static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
switch (type) {
case NL80211_IFTYPE_P2P_GO: