[PATCH v2 1/2] mwifiex: replace rx_pkt_lock by rx_reorder_tbl_lock

[PATCH v2 1/2] mwifiex: replace rx_pkt_lock by rx_reorder_tbl_lock

[Ganapathi Bhat]

At present driver spinlock protects iteration of list
rx_reorder_tbl_ptr with rx_reorder_tbl_lock. To protect the
individual items in this list, it uses rx_pkt_lock. But, we can
use a single rx_reorder_tbl_lock for both purposes. This patch
replaces rx_pkt_lock by rx_reorder_tbl_lock.

Signed-off-by: Ganapathi Bhat <gbhat@marvell.com>
---
v2: same as v1
---
 drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c | 19 ++++++++++---------
 drivers/net/wireless/marvell/mwifiex/init.c          |  1 -
 drivers/net/wireless/marvell/mwifiex/main.h          |  3 ---
 3 files changed, 10 insertions(+), 13 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c b/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c
index 7ab44cd..5380fba 100644
--- a/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c
+++ b/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c
@@ -118,18 +118,18 @@ static int mwifiex_11n_dispatch_pkt(struct mwifiex_private *priv, void *payload)
 		      tbl->win_size;
 
 	for (i = 0; i < pkt_to_send; ++i) {
-		spin_lock_irqsave(&priv->rx_pkt_lock, flags);
+		spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 		rx_tmp_ptr = NULL;
 		if (tbl->rx_reorder_ptr[i]) {
 			rx_tmp_ptr = tbl->rx_reorder_ptr[i];
 			tbl->rx_reorder_ptr[i] = NULL;
 		}
-		spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
+		spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 		if (rx_tmp_ptr)
 			mwifiex_11n_dispatch_pkt(priv, rx_tmp_ptr);
 	}
 
-	spin_lock_irqsave(&priv->rx_pkt_lock, flags);
+	spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 	/*
 	 * We don't have a circular buffer, hence use rotation to simulate
 	 * circular buffer
@@ -140,7 +140,7 @@ static int mwifiex_11n_dispatch_pkt(struct mwifiex_private *priv, void *payload)
 	}
 
 	tbl->start_win = start_win;
-	spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
+	spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 }
 
 /*
@@ -160,18 +160,19 @@ static int mwifiex_11n_dispatch_pkt(struct mwifiex_private *priv, void *payload)
 	unsigned long flags;
 
 	for (i = 0; i < tbl->win_size; ++i) {
-		spin_lock_irqsave(&priv->rx_pkt_lock, flags);
+		spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 		if (!tbl->rx_reorder_ptr[i]) {
-			spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
+			spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
+					       flags);
 			break;
 		}
 		rx_tmp_ptr = tbl->rx_reorder_ptr[i];
 		tbl->rx_reorder_ptr[i] = NULL;
-		spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
+		spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 		mwifiex_11n_dispatch_pkt(priv, rx_tmp_ptr);
 	}
 
-	spin_lock_irqsave(&priv->rx_pkt_lock, flags);
+	spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 	/*
 	 * We don't have a circular buffer, hence use rotation to simulate
 	 * circular buffer
@@ -184,7 +185,7 @@ static int mwifiex_11n_dispatch_pkt(struct mwifiex_private *priv, void *payload)
 		}
 	}
 	tbl->start_win = (tbl->start_win + i) & (MAX_TID_VALUE - 1);
-	spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
+	spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 }
 
 /*
diff --git a/drivers/net/wireless/marvell/mwifiex/init.c b/drivers/net/wireless/marvell/mwifiex/init.c
index d239e92..dab02d7 100644
--- a/drivers/net/wireless/marvell/mwifiex/init.c
+++ b/drivers/net/wireless/marvell/mwifiex/init.c
@@ -439,7 +439,6 @@ int mwifiex_init_lock_list(struct mwifiex_adapter *adapter)
 	for (i = 0; i < adapter->priv_num; i++) {
 		if (adapter->priv[i]) {
 			priv = adapter->priv[i];
-			spin_lock_init(&priv->rx_pkt_lock);
 			spin_lock_init(&priv->wmm.ra_list_spinlock);
 			spin_lock_init(&priv->curr_bcn_buf_lock);
 			spin_lock_init(&priv->sta_list_spinlock);
diff --git a/drivers/net/wireless/marvell/mwifiex/main.h b/drivers/net/wireless/marvell/mwifiex/main.h
index 69ac0a2..d2b54be 100644
--- a/drivers/net/wireless/marvell/mwifiex/main.h
+++ b/drivers/net/wireless/marvell/mwifiex/main.h
@@ -616,9 +616,6 @@ struct mwifiex_private {
 	struct list_head rx_reorder_tbl_ptr;
 	/* spin lock for rx_reorder_tbl_ptr queue */
 	spinlock_t rx_reorder_tbl_lock;
-	/* spin lock for Rx packets */
-	spinlock_t rx_pkt_lock;
-
 #define MWIFIEX_ASSOC_RSP_BUF_SIZE  500
 	u8 assoc_rsp_buf[MWIFIEX_ASSOC_RSP_BUF_SIZE];
 	u32 assoc_rsp_size;
-- 
1.9.1

[PATCH v2 2/2] mwifiex: restructure rx_reorder_tbl_lock usage

[Ganapathi Bhat]

Driver must ensure that whenever it holds a pointer to the list
entry mwifiex_rx_reorder_tbl, it must protect the same with
rx_reorder_tbl_lock. At present there are many places where
driver does not ensure this. To cover all cases, spinlocks in
below funcions are moved out and made sure that the caller will
hold the spinlock:
mwifiex_11n_dispatch_pkt_until_start_win()
mwifiex_11n_scan_and_dispatch()
mwifiex_del_rx_reorder_entry()
mwifiex_11n_get_rx_reorder_tbl()
mwifiex_11n_find_last_seq_num()

Signed-off-by: Ganapathi Bhat <gbhat@marvell.com>
---
v2: - Fixed an unmatched spin_unlock_irqrestore, which was made
      visible by cross compilation warning
    - Added comments for respective functions to tell the caller
      to hold spinlock
---
 drivers/net/wireless/marvell/mwifiex/11n.c         |  5 +-
 .../net/wireless/marvell/mwifiex/11n_rxreorder.c   | 96 +++++++++++-----------
 drivers/net/wireless/marvell/mwifiex/uap_txrx.c    |  3 +
 3 files changed, 53 insertions(+), 51 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/11n.c b/drivers/net/wireless/marvell/mwifiex/11n.c
index 5d75c97..e2addd8 100644
--- a/drivers/net/wireless/marvell/mwifiex/11n.c
+++ b/drivers/net/wireless/marvell/mwifiex/11n.c
@@ -696,10 +696,11 @@ void mwifiex_11n_delba(struct mwifiex_private *priv, int tid)
 				"Send delba to tid=%d, %pM\n",
 				tid, rx_reor_tbl_ptr->ta);
 			mwifiex_send_delba(priv, tid, rx_reor_tbl_ptr->ta, 0);
-			goto exit;
+			spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
+					       flags);
+			return;
 		}
 	}
-exit:
 	spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 }
 
diff --git a/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c b/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c
index 5380fba..8e63d14 100644
--- a/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c
+++ b/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c
@@ -103,6 +103,8 @@ static int mwifiex_11n_dispatch_pkt(struct mwifiex_private *priv, void *payload)
  * There could be holes in the buffer, which are skipped by the function.
  * Since the buffer is linear, the function uses rotation to simulate
  * circular buffer.
+ *
+ * The caller must hold rx_reorder_tbl_lock spinlock.
  */
 static void
 mwifiex_11n_dispatch_pkt_until_start_win(struct mwifiex_private *priv,
@@ -111,25 +113,21 @@ static int mwifiex_11n_dispatch_pkt(struct mwifiex_private *priv, void *payload)
 {
 	int pkt_to_send, i;
 	void *rx_tmp_ptr;
-	unsigned long flags;
 
 	pkt_to_send = (start_win > tbl->start_win) ?
 		      min((start_win - tbl->start_win), tbl->win_size) :
 		      tbl->win_size;
 
 	for (i = 0; i < pkt_to_send; ++i) {
-		spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 		rx_tmp_ptr = NULL;
 		if (tbl->rx_reorder_ptr[i]) {
 			rx_tmp_ptr = tbl->rx_reorder_ptr[i];
 			tbl->rx_reorder_ptr[i] = NULL;
 		}
-		spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 		if (rx_tmp_ptr)
 			mwifiex_11n_dispatch_pkt(priv, rx_tmp_ptr);
 	}
 
-	spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 	/*
 	 * We don't have a circular buffer, hence use rotation to simulate
 	 * circular buffer
@@ -140,7 +138,6 @@ static int mwifiex_11n_dispatch_pkt(struct mwifiex_private *priv, void *payload)
 	}
 
 	tbl->start_win = start_win;
-	spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 }
 
 /*
@@ -150,6 +147,8 @@ static int mwifiex_11n_dispatch_pkt(struct mwifiex_private *priv, void *payload)
  * The start window is adjusted automatically when a hole is located.
  * Since the buffer is linear, the function uses rotation to simulate
  * circular buffer.
+ *
+ * The caller must hold rx_reorder_tbl_lock spinlock.
  */
 static void
 mwifiex_11n_scan_and_dispatch(struct mwifiex_private *priv,
@@ -157,22 +156,15 @@ static int mwifiex_11n_dispatch_pkt(struct mwifiex_private *priv, void *payload)
 {
 	int i, j, xchg;
 	void *rx_tmp_ptr;
-	unsigned long flags;
 
 	for (i = 0; i < tbl->win_size; ++i) {
-		spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
-		if (!tbl->rx_reorder_ptr[i]) {
-			spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
-					       flags);
+		if (!tbl->rx_reorder_ptr[i])
 			break;
-		}
 		rx_tmp_ptr = tbl->rx_reorder_ptr[i];
 		tbl->rx_reorder_ptr[i] = NULL;
-		spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 		mwifiex_11n_dispatch_pkt(priv, rx_tmp_ptr);
 	}
 
-	spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 	/*
 	 * We don't have a circular buffer, hence use rotation to simulate
 	 * circular buffer
@@ -185,7 +177,6 @@ static int mwifiex_11n_dispatch_pkt(struct mwifiex_private *priv, void *payload)
 		}
 	}
 	tbl->start_win = (tbl->start_win + i) & (MAX_TID_VALUE - 1);
-	spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 }
 
 /*
@@ -193,6 +184,8 @@ static int mwifiex_11n_dispatch_pkt(struct mwifiex_private *priv, void *payload)
  *
  * The function stops the associated timer and dispatches all the
  * pending packets in the Rx reorder table before deletion.
+ *
+ * The caller must hold rx_reorder_tbl_lock spinlock.
  */
 static void
 mwifiex_del_rx_reorder_entry(struct mwifiex_private *priv,
@@ -218,11 +211,7 @@ static int mwifiex_11n_dispatch_pkt(struct mwifiex_private *priv, void *payload)
 
 	del_timer_sync(&tbl->timer_context.timer);
 	tbl->timer_context.timer_is_set = false;
-
-	spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 	list_del(&tbl->list);
-	spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
-
 	kfree(tbl->rx_reorder_ptr);
 	kfree(tbl);
 
@@ -235,22 +224,17 @@ static int mwifiex_11n_dispatch_pkt(struct mwifiex_private *priv, void *payload)
 /*
  * This function returns the pointer to an entry in Rx reordering
  * table which matches the given TA/TID pair.
+ *
+ * The caller must hold rx_reorder_tbl_lock spinlock.
  */
 struct mwifiex_rx_reorder_tbl *
 mwifiex_11n_get_rx_reorder_tbl(struct mwifiex_private *priv, int tid, u8 *ta)
 {
 	struct mwifiex_rx_reorder_tbl *tbl;
-	unsigned long flags;
 
-	spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
-	list_for_each_entry(tbl, &priv->rx_reorder_tbl_ptr, list) {
-		if (!memcmp(tbl->ta, ta, ETH_ALEN) && tbl->tid == tid) {
-			spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
-					       flags);
+	list_for_each_entry(tbl, &priv->rx_reorder_tbl_ptr, list)
+		if (!memcmp(tbl->ta, ta, ETH_ALEN) && tbl->tid == tid)
 			return tbl;
-		}
-	}
-	spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 
 	return NULL;
 }
@@ -267,14 +251,9 @@ void mwifiex_11n_del_rx_reorder_tbl_by_ta(struct mwifiex_private *priv, u8 *ta)
 		return;
 
 	spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
-	list_for_each_entry_safe(tbl, tmp, &priv->rx_reorder_tbl_ptr, list) {
-		if (!memcmp(tbl->ta, ta, ETH_ALEN)) {
-			spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
-					       flags);
+	list_for_each_entry_safe(tbl, tmp, &priv->rx_reorder_tbl_ptr, list)
+		if (!memcmp(tbl->ta, ta, ETH_ALEN))
 			mwifiex_del_rx_reorder_entry(priv, tbl);
-			spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
-		}
-	}
 	spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 
 	return;
@@ -283,24 +262,18 @@ void mwifiex_11n_del_rx_reorder_tbl_by_ta(struct mwifiex_private *priv, u8 *ta)
 /*
  * This function finds the last sequence number used in the packets
  * buffered in Rx reordering table.
+ *
+ * The caller must hold rx_reorder_tbl_lock spinlock.
  */
 static int
 mwifiex_11n_find_last_seq_num(struct reorder_tmr_cnxt *ctx)
 {
 	struct mwifiex_rx_reorder_tbl *rx_reorder_tbl_ptr = ctx->ptr;
-	struct mwifiex_private *priv = ctx->priv;
-	unsigned long flags;
 	int i;
 
-	spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
-	for (i = rx_reorder_tbl_ptr->win_size - 1; i >= 0; --i) {
-		if (rx_reorder_tbl_ptr->rx_reorder_ptr[i]) {
-			spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
-					       flags);
+	for (i = rx_reorder_tbl_ptr->win_size - 1; i >= 0; --i)
+		if (rx_reorder_tbl_ptr->rx_reorder_ptr[i])
 			return i;
-		}
-	}
-	spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 
 	return -1;
 }
@@ -318,17 +291,22 @@ void mwifiex_11n_del_rx_reorder_tbl_by_ta(struct mwifiex_private *priv, u8 *ta)
 	struct reorder_tmr_cnxt *ctx =
 		from_timer(ctx, t, timer);
 	int start_win, seq_num;
+	unsigned long flags;
 
 	ctx->timer_is_set = false;
+	spin_lock_irqsave(&ctx->priv->rx_reorder_tbl_lock, flags);
 	seq_num = mwifiex_11n_find_last_seq_num(ctx);
 
-	if (seq_num < 0)
+	if (seq_num < 0) {
+		spin_unlock_irqrestore(&ctx->priv->rx_reorder_tbl_lock, flags);
 		return;
+	}
 
 	mwifiex_dbg(ctx->priv->adapter, INFO, "info: flush data %d\n", seq_num);
 	start_win = (ctx->ptr->start_win + seq_num + 1) & (MAX_TID_VALUE - 1);
 	mwifiex_11n_dispatch_pkt_until_start_win(ctx->priv, ctx->ptr,
 						 start_win);
+	spin_unlock_irqrestore(&ctx->priv->rx_reorder_tbl_lock, flags);
 }
 
 /*
@@ -355,11 +333,14 @@ void mwifiex_11n_del_rx_reorder_tbl_by_ta(struct mwifiex_private *priv, u8 *ta)
 	 * If we get a TID, ta pair which is already present dispatch all the
 	 * the packets and move the window size until the ssn
 	 */
+	spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 	tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid, ta);
 	if (tbl) {
 		mwifiex_11n_dispatch_pkt_until_start_win(priv, tbl, seq_num);
+		spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 		return;
 	}
+	spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 	/* if !tbl then create one */
 	new_node = kzalloc(sizeof(struct mwifiex_rx_reorder_tbl), GFP_KERNEL);
 	if (!new_node)
@@ -570,16 +551,20 @@ int mwifiex_11n_rx_reorder_pkt(struct mwifiex_private *priv,
 	int prev_start_win, start_win, end_win, win_size;
 	u16 pkt_index;
 	bool init_window_shift = false;
+	unsigned long flags;
 	int ret = 0;
 
+	spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 	tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid, ta);
 	if (!tbl) {
+		spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 		if (pkt_type != PKT_TYPE_BAR)
 			mwifiex_11n_dispatch_pkt(priv, payload);
 		return ret;
 	}
 
 	if ((pkt_type == PKT_TYPE_AMSDU) && !tbl->amsdu) {
+		spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 		mwifiex_11n_dispatch_pkt(priv, payload);
 		return ret;
 	}
@@ -666,6 +651,8 @@ int mwifiex_11n_rx_reorder_pkt(struct mwifiex_private *priv,
 	if (!tbl->timer_context.timer_is_set ||
 	    prev_start_win != tbl->start_win)
 		mwifiex_11n_rxreorder_timer_restart(tbl);
+
+	spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 	return ret;
 }
 
@@ -694,14 +681,18 @@ int mwifiex_11n_rx_reorder_pkt(struct mwifiex_private *priv,
 		    peer_mac, tid, initiator);
 
 	if (cleanup_rx_reorder_tbl) {
+		spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 		tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
 								 peer_mac);
 		if (!tbl) {
+			spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
+					       flags);
 			mwifiex_dbg(priv->adapter, EVENT,
 				    "event: TID, TA not found in table\n");
 			return;
 		}
 		mwifiex_del_rx_reorder_entry(priv, tbl);
+		spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 	} else {
 		ptx_tbl = mwifiex_get_ba_tbl(priv, tid, peer_mac);
 		if (!ptx_tbl) {
@@ -735,6 +726,7 @@ int mwifiex_ret_11n_addba_resp(struct mwifiex_private *priv,
 	int tid, win_size;
 	struct mwifiex_rx_reorder_tbl *tbl;
 	uint16_t block_ack_param_set;
+	unsigned long flags;
 
 	block_ack_param_set = le16_to_cpu(add_ba_rsp->block_ack_param_set);
 
@@ -748,17 +740,20 @@ int mwifiex_ret_11n_addba_resp(struct mwifiex_private *priv,
 		mwifiex_dbg(priv->adapter, ERROR, "ADDBA RSP: failed %pM tid=%d)\n",
 			    add_ba_rsp->peer_mac_addr, tid);
 
+		spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 		tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
 						     add_ba_rsp->peer_mac_addr);
 		if (tbl)
 			mwifiex_del_rx_reorder_entry(priv, tbl);
 
+		spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 		return 0;
 	}
 
 	win_size = (block_ack_param_set & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK)
 		    >> BLOCKACKPARAM_WINSIZE_POS;
 
+	spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 	tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
 					     add_ba_rsp->peer_mac_addr);
 	if (tbl) {
@@ -769,6 +764,7 @@ int mwifiex_ret_11n_addba_resp(struct mwifiex_private *priv,
 		else
 			tbl->amsdu = false;
 	}
+	spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 
 	mwifiex_dbg(priv->adapter, CMD,
 		    "cmd: ADDBA RSP: %pM tid=%d ssn=%d win_size=%d\n",
@@ -808,11 +804,8 @@ void mwifiex_11n_cleanup_reorder_tbl(struct mwifiex_private *priv)
 
 	spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 	list_for_each_entry_safe(del_tbl_ptr, tmp_node,
-				 &priv->rx_reorder_tbl_ptr, list) {
-		spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
+				 &priv->rx_reorder_tbl_ptr, list)
 		mwifiex_del_rx_reorder_entry(priv, del_tbl_ptr);
-		spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
-	}
 	INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
 	spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 
@@ -936,6 +929,7 @@ void mwifiex_11n_rxba_sync_event(struct mwifiex_private *priv,
 	int tlv_buf_left = len;
 	int ret;
 	u8 *tmp;
+	unsigned long flags;
 
 	mwifiex_dbg_dump(priv->adapter, EVT_D, "RXBA_SYNC event:",
 			 event_buf, len);
@@ -955,14 +949,18 @@ void mwifiex_11n_rxba_sync_event(struct mwifiex_private *priv,
 			    tlv_rxba->mac, tlv_rxba->tid, tlv_seq_num,
 			    tlv_bitmap_len);
 
+		spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 		rx_reor_tbl_ptr =
 			mwifiex_11n_get_rx_reorder_tbl(priv, tlv_rxba->tid,
 						       tlv_rxba->mac);
 		if (!rx_reor_tbl_ptr) {
+			spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
+					       flags);
 			mwifiex_dbg(priv->adapter, ERROR,
 				    "Can not find rx_reorder_tbl!");
 			return;
 		}
+		spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 
 		for (i = 0; i < tlv_bitmap_len; i++) {
 			for (j = 0 ; j < 8; j++) {
diff --git a/drivers/net/wireless/marvell/mwifiex/uap_txrx.c b/drivers/net/wireless/marvell/mwifiex/uap_txrx.c
index 1e6a62c..99cfaee 100644
--- a/drivers/net/wireless/marvell/mwifiex/uap_txrx.c
+++ b/drivers/net/wireless/marvell/mwifiex/uap_txrx.c
@@ -421,12 +421,15 @@ int mwifiex_process_uap_rx_packet(struct mwifiex_private *priv,
 		spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 	}
 
+	spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 	if (!priv->ap_11n_enabled ||
 	    (!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) &&
 	    (le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) {
 		ret = mwifiex_handle_uap_rx_forward(priv, skb);
+		spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 		return ret;
 	}
+	spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 
 	/* Reorder and send to kernel */
 	pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type);
-- 
1.9.1

Re: [PATCH v2 1/2] mwifiex: replace rx_pkt_lock by rx_reorder_tbl_lock

[Kalle Valo]

Ganapathi Bhat <gbhat@marvell.com> wrote:

> At present driver spinlock protects iteration of list
> rx_reorder_tbl_ptr with rx_reorder_tbl_lock. To protect the
> individual items in this list, it uses rx_pkt_lock. But, we can
> use a single rx_reorder_tbl_lock for both purposes. This patch
> replaces rx_pkt_lock by rx_reorder_tbl_lock.
> 
> Signed-off-by: Ganapathi Bhat <gbhat@marvell.com>

2 patches applied to wireless-drivers-next.git, thanks.

5631909364e1 mwifiex: replace rx_pkt_lock by rx_reorder_tbl_lock
5188d5453bc9 mwifiex: restructure rx_reorder_tbl_lock usage

-- 
https://patchwork.kernel.org/patch/10490657/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches