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From: Johannes Berg <johannes@sipsolutions.net>
To: linux-wireless@vger.kernel.org
Cc: Sara Sharon <sara.sharon@intel.com>
Subject: [PATCH 04/12] cfg80211: Properly track transmitting and non-transmitting BSS
Date: Fri, 25 Jan 2019 12:48:17 +0100	[thread overview]
Message-ID: <20190125114825.5872-4-johannes@sipsolutions.net> (raw)
In-Reply-To: <20190125114825.5872-1-johannes@sipsolutions.net>

From: Sara Sharon <sara.sharon@intel.com>

When holding data of the non-transmitting BSS, we need to keep the
transmitting BSS data on. Otherwise it will be released, and release
the non-transmitting BSS with it.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
 net/wireless/core.h | 12 ++++++++++++
 net/wireless/scan.c | 36 ++++++++++++++++++++++++++++++++++--
 2 files changed, 46 insertions(+), 2 deletions(-)

diff --git a/net/wireless/core.h b/net/wireless/core.h
index a50b92ac77a1..c20c75df60f5 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -153,6 +153,7 @@ struct cfg80211_internal_bss {
 	struct list_head list;
 	struct list_head hidden_list;
 	struct list_head nontrans_list;
+	struct cfg80211_bss *transmitted_bss;
 	struct rb_node rbn;
 	u64 ts_boottime;
 	unsigned long ts;
@@ -183,12 +184,23 @@ static inline struct cfg80211_internal_bss *bss_from_pub(struct cfg80211_bss *pu
 static inline void cfg80211_hold_bss(struct cfg80211_internal_bss *bss)
 {
 	atomic_inc(&bss->hold);
+	if (bss->transmitted_bss) {
+		bss = container_of(bss->transmitted_bss,
+				   struct cfg80211_internal_bss, pub);
+		atomic_inc(&bss->hold);
+	}
 }
 
 static inline void cfg80211_unhold_bss(struct cfg80211_internal_bss *bss)
 {
 	int r = atomic_dec_return(&bss->hold);
 	WARN_ON(r < 0);
+	if (bss->transmitted_bss) {
+		bss = container_of(bss->transmitted_bss,
+				   struct cfg80211_internal_bss, pub);
+		r = atomic_dec_return(&bss->hold);
+		WARN_ON(r < 0);
+	}
 }
 
 
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index d50fee7da88b..1584505c6809 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -110,6 +110,12 @@ static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
 				   pub);
 		bss->refcount++;
 	}
+	if (bss->transmitted_bss) {
+		bss = container_of(bss->transmitted_bss,
+				   struct cfg80211_internal_bss,
+				   pub);
+		bss->refcount++;
+	}
 }
 
 static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
@@ -126,6 +132,18 @@ static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
 		if (hbss->refcount == 0)
 			bss_free(hbss);
 	}
+
+	if (bss->transmitted_bss) {
+		struct cfg80211_internal_bss *tbss;
+
+		tbss = container_of(bss->transmitted_bss,
+				    struct cfg80211_internal_bss,
+				    pub);
+		tbss->refcount--;
+		if (tbss->refcount == 0)
+			bss_free(tbss);
+	}
+
 	bss->refcount--;
 	if (bss->refcount == 0)
 		bss_free(bss);
@@ -1031,6 +1049,7 @@ static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
 static struct cfg80211_internal_bss *
 cfg80211_bss_update(struct cfg80211_registered_device *rdev,
 		    struct cfg80211_internal_bss *tmp,
+		    struct cfg80211_bss *trans_bss,
 		    bool signal_valid)
 {
 	struct cfg80211_internal_bss *found = NULL;
@@ -1188,6 +1207,17 @@ cfg80211_bss_update(struct cfg80211_registered_device *rdev,
 			goto drop;
 		}
 
+		/* This must be before the call to bss_ref_get */
+		if (trans_bss) {
+			struct cfg80211_internal_bss *pbss =
+				container_of(trans_bss,
+					     struct cfg80211_internal_bss,
+					     pub);
+
+			new->transmitted_bss = trans_bss;
+			bss_ref_get(rdev, pbss);
+		}
+
 		list_add_tail(&new->list, &rdev->bss_list);
 		rdev->bss_entries++;
 		rb_insert_bss(rdev, new);
@@ -1343,7 +1373,8 @@ cfg80211_inform_single_bss_data(struct wiphy *wiphy,
 
 	signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
 		wiphy->max_adj_channel_rssi_comp;
-	res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
+	res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, trans_bss,
+				  signal_valid);
 	if (!res)
 		return NULL;
 
@@ -1663,7 +1694,8 @@ cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
 
 	signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
 		wiphy->max_adj_channel_rssi_comp;
-	res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
+	res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, trans_bss,
+				  signal_valid);
 	if (!res)
 		return NULL;
 
-- 
2.17.2


  parent reply	other threads:[~2019-01-25 11:48 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-25 11:48 [PATCH 01/12] mac80211: pass bssids to elements parsing function Johannes Berg
2019-01-25 11:48 ` [PATCH 02/12] mac80211: move the bss update from elements to an helper Johannes Berg
2019-01-25 11:48 ` [PATCH 03/12] cfg80211: Parsing of Multiple BSSID information in scanning Johannes Berg
2019-01-25 11:48 ` Johannes Berg [this message]
2019-01-25 11:48 ` [PATCH 05/12] cfg80211: Move Multiple BSS info to struct cfg80211_bss to be visible Johannes Berg
2019-01-25 11:48 ` [PATCH 06/12] cfg80211: properly free nontransmitted list on all paths Johannes Berg
2019-01-25 11:48 ` [PATCH 07/12] cfg80211: parse mbssid only if HW supports it Johannes Berg
2019-01-25 11:48 ` [PATCH 08/12] cfg80211: make BSSID generation function inline Johannes Berg
2019-01-25 11:48 ` [PATCH 09/12] cfg80211: save mbssid properties Johannes Berg
2019-01-25 11:48 ` [PATCH 10/12] mac80211: support mbssid Johannes Berg
2019-01-25 11:48 ` [PATCH 11/12] mac80211: indicate support for multiple BSSID Johannes Berg
2019-01-25 11:48 ` [PATCH 12/12] mac80211_hwsim: Declare support for Multi-BSSID Johannes Berg
2019-01-25 12:16 ` [PATCH 01/12] mac80211: pass bssids to elements parsing function Johannes Berg

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