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authorJohannes Berg <johannes.berg@intel.com>2013-05-10 19:07:52 +0200
committerJohannes Berg <johannes.berg@intel.com>2013-05-25 00:02:18 +0200
commitdb2424c58e5962a87888d25d29ceb0873eef6348 (patch)
tree6979069932dd9b37d30a849b3946891a20f03dc7 /net/wireless
parent1cdd59ce8dcfa850ebb8ac2ab000a2ea572d1d69 (diff)
regulatory: use RCU in regulatory_hint_11d()
Since it just does a quick check of the last regulatory request, the function doesn't have to hold the reg mutex but can use RCU instead. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless')
-rw-r--r--net/wireless/reg.c30
1 files changed, 16 insertions, 14 deletions
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index e76559618588..17e5eccb42c8 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -1715,20 +1715,18 @@ void regulatory_hint_11d(struct wiphy *wiphy, enum ieee80211_band band,
{
char alpha2[2];
enum environment_cap env = ENVIRON_ANY;
- struct regulatory_request *request, *lr;
-
- mutex_lock(&reg_mutex);
- lr = get_last_request();
-
- if (unlikely(!lr))
- goto out;
+ struct regulatory_request *request = NULL, *lr;
/* IE len must be evenly divisible by 2 */
if (country_ie_len & 0x01)
- goto out;
+ return;
if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
- goto out;
+ return;
+
+ request = kzalloc(sizeof(*request), GFP_KERNEL);
+ if (!request)
+ return;
alpha2[0] = country_ie[0];
alpha2[1] = country_ie[1];
@@ -1738,6 +1736,12 @@ void regulatory_hint_11d(struct wiphy *wiphy, enum ieee80211_band band,
else if (country_ie[2] == 'O')
env = ENVIRON_OUTDOOR;
+ rcu_read_lock();
+ lr = get_last_request();
+
+ if (unlikely(!lr))
+ goto out;
+
/*
* We will run this only upon a successful connection on cfg80211.
* We leave conflict resolution to the workqueue, where can hold
@@ -1747,10 +1751,6 @@ void regulatory_hint_11d(struct wiphy *wiphy, enum ieee80211_band band,
lr->wiphy_idx != WIPHY_IDX_INVALID)
goto out;
- request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
- if (!request)
- goto out;
-
request->wiphy_idx = get_wiphy_idx(wiphy);
request->alpha2[0] = alpha2[0];
request->alpha2[1] = alpha2[1];
@@ -1758,8 +1758,10 @@ void regulatory_hint_11d(struct wiphy *wiphy, enum ieee80211_band band,
request->country_ie_env = env;
queue_regulatory_request(request);
+ request = NULL;
out:
- mutex_unlock(&reg_mutex);
+ kfree(request);
+ rcu_read_unlock();
}
static void restore_alpha2(char *alpha2, bool reset_user)

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