mwifiex: remove unused tid_tbl_lock from mwifiex_tid_tbl

ra_list_spinlock is used to protect struct mwifiex_wmm_desc and
embedded structures such as ra_list. tid_tbl_lock while more fine
grained, is not used but in one function. That function is not
called reentrantly. To protect ra_list from concurrent modification
ra_list_spinlock must be held.

Signed-off-by: Andreas Fenkart <andreas.fenkart@streamunlimited.com>
Signed-off-by: Avinash Patil <patila@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/mwifiex/init.c

@@ -533,10 +533,8 @@ int mwifiex_init_lock_list(struct mwifiex_adapter *adapter)
 		if (!adapter->priv[i])
 			continue;
 		priv = adapter->priv[i];
-		for (j = 0; j < MAX_NUM_TID; ++j) {
+		for (j = 0; j < MAX_NUM_TID; ++j)
 			INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[j].ra_list);
-			spin_lock_init(&priv->wmm.tid_tbl_ptr[j].tid_tbl_lock);
-		}
 		INIT_LIST_HEAD(&priv->tx_ba_stream_tbl_ptr);
 		INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
 		INIT_LIST_HEAD(&priv->sta_list);

drivers/net/wireless/mwifiex/main.h

@@ -213,8 +213,6 @@ struct mwifiex_ra_list_tbl {
 
 struct mwifiex_tid_tbl {
 	struct list_head ra_list;
-	/* spin lock for tid table */
-	spinlock_t tid_tbl_lock;
 	struct mwifiex_ra_list_tbl *ra_list_curr;
 };
 

drivers/net/wireless/mwifiex/wmm.c

@@ -927,12 +927,12 @@ mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter,
 				if (!tid_ptr->ra_list_curr)
 					continue;
 
-				spin_lock_irqsave(&tid_ptr->tid_tbl_lock,
-						  flags);
+				spin_lock_irqsave(&priv_tmp->wmm.
+						  ra_list_spinlock, flags);
 				is_list_empty =
 					list_empty(&tid_ptr->ra_list);
-				spin_unlock_irqrestore(&tid_ptr->tid_tbl_lock,
-						       flags);
+				spin_unlock_irqrestore(&priv_tmp->wmm.
+						       ra_list_spinlock, flags);
 				if (is_list_empty)
 					continue;