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regulatory: use RCU in regulatory_hint_11d()

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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>
This commit is contained in:
Johannes Berg 2013-05-10 19:07:52 +02:00
parent 1cdd59ce8d
commit db2424c58e
1 changed files with 16 additions and 14 deletions
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30
net/wireless/reg.c
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@ -1715,20 +1715,18 @@ void regulatory_hint_11d(struct wiphy *wiphy, enum ieee80211_band band,
{ {
char alpha2[2]; char alpha2[2];
enum environment_cap env = ENVIRON_ANY; enum environment_cap env = ENVIRON_ANY;
struct regulatory_request *request, *lr; struct regulatory_request *request = NULL, *lr;
mutex_lock(&reg_mutex);
lr = get_last_request();
if (unlikely(!lr))
goto out;
/* IE len must be evenly divisible by 2 */ /* IE len must be evenly divisible by 2 */
if (country_ie_len & 0x01) if (country_ie_len & 0x01)
goto out; return;
if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) 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[0] = country_ie[0];
alpha2[1] = country_ie[1]; 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') else if (country_ie[2] == 'O')
env = ENVIRON_OUTDOOR; 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 will run this only upon a successful connection on cfg80211.
* We leave conflict resolution to the workqueue, where can hold * 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) lr->wiphy_idx != WIPHY_IDX_INVALID)
goto out; goto out;
request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
if (!request)
goto out;
request->wiphy_idx = get_wiphy_idx(wiphy); request->wiphy_idx = get_wiphy_idx(wiphy);
request->alpha2[0] = alpha2[0]; request->alpha2[0] = alpha2[0];
request->alpha2[1] = alpha2[1]; 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; request->country_ie_env = env;
queue_regulatory_request(request); queue_regulatory_request(request);
request = NULL;
out: out:
mutex_unlock(&reg_mutex); kfree(request);
rcu_read_unlock();
} }
static void restore_alpha2(char *alpha2, bool reset_user) static void restore_alpha2(char *alpha2, bool reset_user)