diff options
| author | Michal Kazior <michal.kazior@tieto.com> | 2014-04-09 15:29:24 +0200 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2014-04-25 17:08:15 +0200 |
| commit | c2b90ad8800db308cdc0db9750c7c0baa07f40d0 (patch) | |
| tree | bd77ee2bd44e3de694aa2d0bb12e0822af48092d /net/mac80211 | |
| parent | 6fa001bc7e1ccd7482f0f089fb970d65a5aca59a (diff) | |
mac80211: prevent chanctx overcommit
Do not allocate more channel contexts than a
driver is capable for currently matching interface
combination.
This allows the ieee80211_vif_reserve_chanctx() to
act as a guard against breaking interface
combinations.
Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211')
| -rw-r--r-- | net/mac80211/chan.c | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c index 57b8ab1bc5c1..fcb2cd8ffd07 100644 --- a/net/mac80211/chan.c +++ b/net/mac80211/chan.c @@ -9,6 +9,25 @@ #include "ieee80211_i.h" #include "driver-ops.h" +static int ieee80211_num_chanctx(struct ieee80211_local *local) +{ + struct ieee80211_chanctx *ctx; + int num = 0; + + lockdep_assert_held(&local->chanctx_mtx); + + list_for_each_entry(ctx, &local->chanctx_list, list) + num++; + + return num; +} + +static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local) +{ + lockdep_assert_held(&local->chanctx_mtx); + return ieee80211_num_chanctx(local) < ieee80211_max_num_channels(local); +} + static enum nl80211_chan_width ieee80211_get_sta_bw(struct ieee80211_sta *sta) { switch (sta->bandwidth) { @@ -751,13 +770,16 @@ int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata, * context, reserve our current context */ new_ctx = curr_ctx; - } else { + } else if (ieee80211_can_create_new_chanctx(local)) { /* create a new context and reserve it */ new_ctx = ieee80211_new_chanctx(local, chandef, mode); if (IS_ERR(new_ctx)) { ret = PTR_ERR(new_ctx); goto out; } + } else { + ret = -EBUSY; + goto out; } } |