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mac80211: merge pending cfg80211 patches to fix a race condition with setting the regdomain for multiple cards

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SVN-Revision: 24028
This commit is contained in:
Felix Fietkau 2010-11-18 10:06:08 +00:00
parent ba5296268c
commit f9d20beed7
1 changed files with 178 additions and 0 deletions
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178
package/mac80211/patches/310-pending_work.patch
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@ -112,3 +112,181 @@
return true;
}
--- a/include/net/regulatory.h
+++ b/include/net/regulatory.h
@@ -43,6 +43,12 @@ enum environment_cap {
* @intersect: indicates whether the wireless core should intersect
* the requested regulatory domain with the presently set regulatory
* domain.
+ * @processed: indicates whether or not this requests has already been
+ * processed. When the last request is processed it means that the
+ * currently regulatory domain set on cfg80211 is updated from
+ * CRDA and can be used by other regulatory requests. When a
+ * the last request is not yet processed we must yield until it
+ * is processed before processing any new requests.
* @country_ie_checksum: checksum of the last processed and accepted
* country IE
* @country_ie_env: lets us know if the AP is telling us we are outdoor,
@@ -54,6 +60,7 @@ struct regulatory_request {
enum nl80211_reg_initiator initiator;
char alpha2[2];
bool intersect;
+ bool processed;
enum environment_cap country_ie_env;
struct list_head list;
};
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -96,6 +96,9 @@ struct reg_beacon {
struct ieee80211_channel chan;
};
+static void reg_todo(struct work_struct *work);
+static DECLARE_WORK(reg_work, reg_todo);
+
/* We keep a static world regulatory domain in case of the absence of CRDA */
static const struct ieee80211_regdomain world_regdom = {
.n_reg_rules = 5,
@@ -1317,6 +1320,21 @@ static int ignore_request(struct wiphy *
return -EINVAL;
}
+static void reg_set_request_processed(void)
+{
+ bool need_more_processing = false;
+
+ last_request->processed = true;
+
+ spin_lock(&reg_requests_lock);
+ if (!list_empty(&reg_requests_list))
+ need_more_processing = true;
+ spin_unlock(&reg_requests_lock);
+
+ if (need_more_processing)
+ schedule_work(&reg_work);
+}
+
/**
* __regulatory_hint - hint to the wireless core a regulatory domain
* @wiphy: if the hint comes from country information from an AP, this
@@ -1392,8 +1410,10 @@ new_request:
* have applied the requested regulatory domain before we just
* inform userspace we have processed the request
*/
- if (r == -EALREADY)
+ if (r == -EALREADY) {
nl80211_send_reg_change_event(last_request);
+ reg_set_request_processed();
+ }
return r;
}
@@ -1409,16 +1429,13 @@ static void reg_process_hint(struct regu
BUG_ON(!reg_request->alpha2);
- mutex_lock(&cfg80211_mutex);
- mutex_lock(&reg_mutex);
-
if (wiphy_idx_valid(reg_request->wiphy_idx))
wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
!wiphy) {
kfree(reg_request);
- goto out;
+ return;
}
r = __regulatory_hint(wiphy, reg_request);
@@ -1426,28 +1443,46 @@ static void reg_process_hint(struct regu
if (r == -EALREADY && wiphy &&
wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY)
wiphy_update_regulatory(wiphy, initiator);
-out:
- mutex_unlock(&reg_mutex);
- mutex_unlock(&cfg80211_mutex);
}
-/* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */
+/*
+ * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
+ * Regulatory hints come on a first come first serve basis and we
+ * must process each one atomically.
+ */
static void reg_process_pending_hints(void)
- {
+{
struct regulatory_request *reg_request;
+ mutex_lock(&cfg80211_mutex);
+ mutex_lock(&reg_mutex);
+
+ /* When last_request->processed becomes true this will be rescheduled */
+ if (last_request && !last_request->processed) {
+ REG_DBG_PRINT("Pending regulatory request, waiting "
+ "for it to be processed...");
+ goto out;
+ }
+
spin_lock(&reg_requests_lock);
- while (!list_empty(&reg_requests_list)) {
- reg_request = list_first_entry(&reg_requests_list,
- struct regulatory_request,
- list);
- list_del_init(&reg_request->list);
+ if (list_empty(&reg_requests_list)) {
spin_unlock(&reg_requests_lock);
- reg_process_hint(reg_request);
- spin_lock(&reg_requests_lock);
+ goto out;
}
+
+ reg_request = list_first_entry(&reg_requests_list,
+ struct regulatory_request,
+ list);
+ list_del_init(&reg_request->list);
+
spin_unlock(&reg_requests_lock);
+
+ reg_process_hint(reg_request);
+
+out:
+ mutex_unlock(&reg_mutex);
+ mutex_unlock(&cfg80211_mutex);
}
/* Processes beacon hints -- this has nothing to do with country IEs */
@@ -1494,8 +1529,6 @@ static void reg_todo(struct work_struct
reg_process_pending_beacon_hints();
}
-static DECLARE_WORK(reg_work, reg_todo);
-
static void queue_regulatory_request(struct regulatory_request *request)
{
if (isalpha(request->alpha2[0]))
@@ -1530,12 +1563,7 @@ static int regulatory_hint_core(const ch
request->alpha2[1] = alpha2[1];
request->initiator = NL80211_REGDOM_SET_BY_CORE;
- /*
- * This ensures last_request is populated once modules
- * come swinging in and calling regulatory hints and
- * wiphy_apply_custom_regulatory().
- */
- reg_process_hint(request);
+ queue_regulatory_request(request);
return 0;
}
@@ -2061,6 +2089,8 @@ int set_regdom(const struct ieee80211_re
nl80211_send_reg_change_event(last_request);
+ reg_set_request_processed();
+
mutex_unlock(&reg_mutex);
return r;