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authorJohannes Berg <johannes.berg@intel.com>2012-07-06 21:55:11 +0200
committerJohannes Berg <johannes.berg@intel.com>2012-07-12 12:10:43 +0200
commit5260a5b2c3524f198ea062fe0a6a4faa724e6a9d (patch)
tree9524bf3dbcb65b6a0125e6a276e313527fd4d4d2 /net/mac80211
parente2fd5dbc1c7031be5b5de043bcc0a18c7a59a68a (diff)
mac80211: track scheduled scan virtual interface
Instead of tracking whether or not we're in a scheduled scan, track the virtual interface (sdata) in an RCU-protected pointer to make it usable from RX to check the MAC address. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211')
-rw-r--r--net/mac80211/ieee80211_i.h2
-rw-r--r--net/mac80211/main.c3
-rw-r--r--net/mac80211/rx.c4
-rw-r--r--net/mac80211/scan.c20
4 files changed, 15 insertions, 14 deletions
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 9f2534a41243..e973a8f96c9b 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -965,9 +965,9 @@ struct ieee80211_local {
int scan_channel_idx;
int scan_ies_len;
- bool sched_scanning;
struct ieee80211_sched_scan_ies sched_scan_ies;
struct work_struct sched_scan_stopped_work;
+ struct ieee80211_sub_if_data __rcu *sched_scan_sdata;
unsigned long leave_oper_channel_time;
enum mac80211_scan_state next_scan_state;
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index c794101f8987..c26e231c733a 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -322,7 +322,8 @@ static void ieee80211_restart_work(struct work_struct *work)
mutex_lock(&local->mtx);
WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
- local->sched_scanning,
+ rcu_dereference_protected(local->sched_scan_sdata,
+ lockdep_is_held(&local->mtx)),
"%s called with hardware scan in progress\n", __func__);
mutex_unlock(&local->mtx);
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index f8cf9e7477a3..17a56151be7f 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -421,13 +421,13 @@ ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
struct sk_buff *skb = rx->skb;
if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
- !local->sched_scanning))
+ !rcu_access_pointer(local->sched_scan_sdata)))
return RX_CONTINUE;
if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
test_bit(SCAN_SW_SCANNING, &local->scanning) ||
test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) ||
- local->sched_scanning)
+ rcu_access_pointer(local->sched_scan_sdata))
return ieee80211_scan_rx(rx->sdata, skb);
/* scanning finished during invoking of handlers */
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 704dcf847761..a619c1ea9bd5 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -930,9 +930,9 @@ int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
struct ieee80211_local *local = sdata->local;
int ret, i;
- mutex_lock(&sdata->local->mtx);
+ mutex_lock(&local->mtx);
- if (local->sched_scanning) {
+ if (rcu_access_pointer(local->sched_scan_sdata)) {
ret = -EBUSY;
goto out;
}
@@ -966,7 +966,7 @@ int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
ret = drv_sched_scan_start(local, sdata, req,
&local->sched_scan_ies);
if (ret == 0) {
- local->sched_scanning = true;
+ rcu_assign_pointer(local->sched_scan_sdata, sdata);
goto out;
}
@@ -974,7 +974,7 @@ out_free:
while (i > 0)
kfree(local->sched_scan_ies.ie[--i]);
out:
- mutex_unlock(&sdata->local->mtx);
+ mutex_unlock(&local->mtx);
return ret;
}
@@ -983,22 +983,22 @@ int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata)
struct ieee80211_local *local = sdata->local;
int ret = 0, i;
- mutex_lock(&sdata->local->mtx);
+ mutex_lock(&local->mtx);
if (!local->ops->sched_scan_stop) {
ret = -ENOTSUPP;
goto out;
}
- if (local->sched_scanning) {
+ if (rcu_access_pointer(local->sched_scan_sdata)) {
for (i = 0; i < IEEE80211_NUM_BANDS; i++)
kfree(local->sched_scan_ies.ie[i]);
drv_sched_scan_stop(local, sdata);
- local->sched_scanning = false;
+ rcu_assign_pointer(local->sched_scan_sdata, NULL);
}
out:
- mutex_unlock(&sdata->local->mtx);
+ mutex_unlock(&local->mtx);
return ret;
}
@@ -1022,7 +1022,7 @@ void ieee80211_sched_scan_stopped_work(struct work_struct *work)
mutex_lock(&local->mtx);
- if (!local->sched_scanning) {
+ if (!rcu_access_pointer(local->sched_scan_sdata)) {
mutex_unlock(&local->mtx);
return;
}
@@ -1030,7 +1030,7 @@ void ieee80211_sched_scan_stopped_work(struct work_struct *work)
for (i = 0; i < IEEE80211_NUM_BANDS; i++)
kfree(local->sched_scan_ies.ie[i]);
- local->sched_scanning = false;
+ rcu_assign_pointer(local->sched_scan_sdata, NULL);
mutex_unlock(&local->mtx);