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authorSven Neumann <s.neumann@raumfeld.com>2011-08-31 01:38:53 +0400
committerJohn W. Linville <linville@tuxdriver.com>2011-09-14 21:26:39 +0400
commiteac03e381957a05f3842ceb8de987a1025966ecf (patch)
tree5dfbfa366c63e481eb92b7f61dbabdd4f82b6ad3 /net
parent56e6786e59cba2c714091ed53deffa6001a32841 (diff)
downloadlinux-eac03e381957a05f3842ceb8de987a1025966ecf.tar.xz
cfg80211: hold reg_mutex when updating regulatory
The function wiphy_update_regulatory() uses the static variable last_request and thus needs to be called with reg_mutex held. This is the case for all users in reg.c, but the function was exported for use by wiphy_register(), from where it is called without the lock being held. Fix this by making wiphy_update_regulatory() private and introducing regulatory_update() as a wrapper that acquires and holds the lock. Signed-off-by: Sven Neumann <s.neumann@raumfeld.com> Cc: John W. Linville <linville@tuxdriver.com> Cc: Luis R. Rodriguez <mcgrof@gmail.com> Cc: Daniel Mack <daniel@zonque.org> Cc: linux-wireless@vger.kernel.org Acked-by: Luis R. Rodriguez <mcgrof@qca.qualcomm.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net')
-rw-r--r--net/wireless/core.c2
-rw-r--r--net/wireless/core.h2
-rw-r--r--net/wireless/reg.c17
-rw-r--r--net/wireless/reg.h2
4 files changed, 18 insertions, 5 deletions
diff --git a/net/wireless/core.c b/net/wireless/core.c
index 645437cfc464..44cbebac25e0 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -582,7 +582,7 @@ int wiphy_register(struct wiphy *wiphy)
}
/* set up regulatory info */
- wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
+ regulatory_update(wiphy, NL80211_REGDOM_SET_BY_CORE);
list_add_rcu(&rdev->list, &cfg80211_rdev_list);
cfg80211_rdev_list_generation++;
diff --git a/net/wireless/core.h b/net/wireless/core.h
index 8672e028022f..796a4bdf8b0d 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -279,8 +279,6 @@ extern int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
char *newname);
void ieee80211_set_bitrate_flags(struct wiphy *wiphy);
-void wiphy_update_regulatory(struct wiphy *wiphy,
- enum nl80211_reg_initiator setby);
void cfg80211_bss_expire(struct cfg80211_registered_device *dev);
void cfg80211_bss_age(struct cfg80211_registered_device *dev,
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index a2b09c2df1bf..a1f069da79a4 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -101,6 +101,9 @@ struct reg_beacon {
struct ieee80211_channel chan;
};
+static void wiphy_update_regulatory(struct wiphy *wiphy,
+ enum nl80211_reg_initiator initiator);
+
static void reg_todo(struct work_struct *work);
static DECLARE_WORK(reg_work, reg_todo);
@@ -1118,11 +1121,13 @@ static void reg_process_ht_flags(struct wiphy *wiphy)
}
-void wiphy_update_regulatory(struct wiphy *wiphy,
- enum nl80211_reg_initiator initiator)
+static void wiphy_update_regulatory(struct wiphy *wiphy,
+ enum nl80211_reg_initiator initiator)
{
enum ieee80211_band band;
+ assert_reg_lock();
+
if (ignore_reg_update(wiphy, initiator))
return;
@@ -1137,6 +1142,14 @@ void wiphy_update_regulatory(struct wiphy *wiphy,
wiphy->reg_notifier(wiphy, last_request);
}
+void regulatory_update(struct wiphy *wiphy,
+ enum nl80211_reg_initiator setby)
+{
+ mutex_lock(&reg_mutex);
+ wiphy_update_regulatory(wiphy, setby);
+ mutex_unlock(&reg_mutex);
+}
+
static void handle_channel_custom(struct wiphy *wiphy,
enum ieee80211_band band,
unsigned int chan_idx,
diff --git a/net/wireless/reg.h b/net/wireless/reg.h
index b67d1c3a2fb9..4a56799d868d 100644
--- a/net/wireless/reg.h
+++ b/net/wireless/reg.h
@@ -16,6 +16,8 @@ void regulatory_exit(void);
int set_regdom(const struct ieee80211_regdomain *rd);
+void regulatory_update(struct wiphy *wiphy, enum nl80211_reg_initiator setby);
+
/**
* regulatory_hint_found_beacon - hints a beacon was found on a channel
* @wiphy: the wireless device where the beacon was found on