wifi: cfg80211: check RTNL when iterating devices

Add a new "for_each_rdev()" macro and check that we
hold the RTNL when calling it.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index 0b7e81d..3c691ae 100644 (file)
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -823,7 +823,7 @@ bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy,
        if (!(chan->flags & IEEE80211_CHAN_RADAR))
                return false;
 
-       list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+       for_each_rdev(rdev) {
                if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))
                        continue;
 

diff --git a/net/wireless/core.c b/net/wireless/core.c
index 25bc2e5..fdb9d73 100644 (file)
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -60,7 +60,7 @@ struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
 
        ASSERT_RTNL();
 
-       list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+       for_each_rdev(rdev) {
                if (rdev->wiphy_idx == wiphy_idx) {
                        result = rdev;
                        break;
@@ -116,7 +116,7 @@ static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
        }
 
        /* Ensure another device does not already have this name. */
-       list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
+       for_each_rdev(rdev2)
                if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
                        return -EINVAL;
 
@@ -1601,7 +1601,7 @@ static void __net_exit cfg80211_pernet_exit(struct net *net)
        struct cfg80211_registered_device *rdev;
 
        rtnl_lock();
-       list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+       for_each_rdev(rdev) {
                if (net_eq(wiphy_net(&rdev->wiphy), net))
                        WARN_ON(cfg80211_switch_netns(rdev, &init_net));
        }

diff --git a/net/wireless/core.h b/net/wireless/core.h
index 507d184..d497655 100644 (file)
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -160,6 +160,16 @@ extern struct workqueue_struct *cfg80211_wq;
 extern struct list_head cfg80211_rdev_list;
 extern int cfg80211_rdev_list_generation;
 
+/* This is constructed like this so it can be used in if/else */
+static inline int for_each_rdev_check_rtnl(void)
+{
+       ASSERT_RTNL();
+       return 0;
+}
+#define for_each_rdev(rdev)                                            \
+       if (for_each_rdev_check_rtnl()) {} else                         \
+               list_for_each_entry(rdev, &cfg80211_rdev_list, list)
+
 struct cfg80211_internal_bss {
        struct list_head list;
        struct list_head hidden_list;

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index de47838..f429810 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -106,7 +106,7 @@ __cfg80211_wdev_from_attrs(struct cfg80211_registered_device *rdev,
 
        ASSERT_RTNL();
 
-       list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+       for_each_rdev(rdev) {
                struct wireless_dev *wdev;
 
                if (wiphy_net(&rdev->wiphy) != netns)
@@ -3075,7 +3075,7 @@ static int nl80211_dump_wiphy(struct sk_buff *skb, struct netlink_callback *cb)
                cb->args[0] = (long)state;
        }
 
-       list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+       for_each_rdev(rdev) {
                if (!net_eq(wiphy_net(&rdev->wiphy), sock_net(skb->sk)))
                        continue;
                if (++idx <= state->start)
@@ -3985,7 +3985,7 @@ static int nl80211_dump_interface(struct sk_buff *skb, struct netlink_callback *
                filter_wiphy = cb->args[2] - 1;
        }
 
-       list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+       for_each_rdev(rdev) {
                if (!net_eq(wiphy_net(&rdev->wiphy), sock_net(skb->sk)))
                        continue;
                if (wp_idx < wp_start) {

diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 0317cf9..f861d1d 100644 (file)
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -2461,7 +2461,7 @@ static void reg_check_chans_work(struct work_struct *work)
        pr_debug("Verifying active interfaces after reg change\n");
        rtnl_lock();
 
-       list_for_each_entry(rdev, &cfg80211_rdev_list, list)
+       for_each_rdev(rdev)
                reg_leave_invalid_chans(&rdev->wiphy);
 
        rtnl_unlock();
@@ -2515,7 +2515,7 @@ static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
 
        ASSERT_RTNL();
 
-       list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+       for_each_rdev(rdev) {
                wiphy = &rdev->wiphy;
                wiphy_update_regulatory(wiphy, initiator);
        }
@@ -2991,7 +2991,7 @@ static void wiphy_all_share_dfs_chan_state(struct wiphy *wiphy)
 
        ASSERT_RTNL();
 
-       list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+       for_each_rdev(rdev) {
                if (wiphy == &rdev->wiphy)
                        continue;
                wiphy_share_dfs_chan_state(wiphy, &rdev->wiphy);
@@ -3057,7 +3057,7 @@ static void notify_self_managed_wiphys(struct regulatory_request *request)
        struct cfg80211_registered_device *rdev;
        struct wiphy *wiphy;
 
-       list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+       for_each_rdev(rdev) {
                wiphy = &rdev->wiphy;
                if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED &&
                    request->initiator == NL80211_REGDOM_SET_BY_USER)
@@ -3122,7 +3122,7 @@ static void reg_process_pending_beacon_hints(void)
                list_del_init(&pending_beacon->list);
 
                /* Applies the beacon hint to current wiphys */
-               list_for_each_entry(rdev, &cfg80211_rdev_list, list)
+               for_each_rdev(rdev)
                        wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
 
                /* Remembers the beacon hint for new wiphys or reg changes */
@@ -3177,7 +3177,7 @@ static void reg_process_self_managed_hints(void)
 
        ASSERT_RTNL();
 
-       list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+       for_each_rdev(rdev) {
                wiphy_lock(&rdev->wiphy);
                reg_process_self_managed_hint(&rdev->wiphy);
                wiphy_unlock(&rdev->wiphy);
@@ -3517,7 +3517,7 @@ static void restore_regulatory_settings(bool reset_user, bool cached)
        world_alpha2[0] = cfg80211_world_regdom->alpha2[0];
        world_alpha2[1] = cfg80211_world_regdom->alpha2[1];
 
-       list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+       for_each_rdev(rdev) {
                if (rdev->wiphy.regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
                        continue;
                if (rdev->wiphy.regulatory_flags & REGULATORY_CUSTOM_REG)
@@ -3574,7 +3574,7 @@ static bool is_wiphy_all_set_reg_flag(enum ieee80211_regulatory_flags flag)
        struct cfg80211_registered_device *rdev;
        struct wireless_dev *wdev;
 
-       list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+       for_each_rdev(rdev) {
                list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
                        wdev_lock(wdev);
                        if (!(wdev->wiphy->regulatory_flags & flag)) {
@@ -4244,7 +4244,7 @@ void regulatory_propagate_dfs_state(struct wiphy *wiphy,
        if (WARN_ON(!cfg80211_chandef_valid(chandef)))
                return;
 
-       list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+       for_each_rdev(rdev) {
                if (wiphy == &rdev->wiphy)
                        continue;
 

diff --git a/net/wireless/sme.c b/net/wireless/sme.c
index 9bba233..53ba46f 100644 (file)
--- a/net/wireless/sme.c
+++ b/net/wireless/sme.c
@@ -702,7 +702,7 @@ static bool cfg80211_is_all_idle(void)
         * need not issue a disconnect hint and reset any info such
         * as chan dfs state, etc.
         */
-       list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+       for_each_rdev(rdev) {
                list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
                        wdev_lock(wdev);
                        if (wdev->conn || wdev->connected ||