qcacld-3.0: Replace rcu lock with rtnl lock

Currently mutex is being called while taking rcu read lock
which is resulting in "sleeping function called from invalid context"
warning as mutex is not allowed while holding rcu_read_lock.

To fix the issue replace rcu lock with rtnl lock.

CRs-Fixed: 3600635
Change-Id: I41aa27094ef58363eeda4bdb15f23d312e7bac37

os_if/dp/src/os_if_dp_txrx.c

@@ -29,6 +29,7 @@
 #include <linux/if_ether.h>
 #include <linux/inetdevice.h>
 #include <linux/wireless.h>
+#include <linux/rtnetlink.h>
 #include <net/cfg80211.h>
 #include <cdp_txrx_cmn.h>
 #include <cdp_txrx_peer_ops.h>
@@ -385,15 +386,12 @@ __osif_check_for_prio_filter_in_clsact_qdisc(struct tcf_block *block,
 	struct tcf_proto *tp_next;
 	enum qdisc_filter_status ret = QDISC_FILTER_PRIO_MISMATCH;
 
-	if (!rtnl_trylock())
-		return QDISC_FILTER_RTNL_LOCK_FAIL;
-
 	mutex_lock(&block->lock);
 	list_for_each_entry(chain, &block->chain_list, list) {
 		mutex_lock(&chain->filter_chain_lock);
 		tp = tcf_chain_dereference(chain->filter_chain, chain);
 		while (tp) {
-			tp_next = rcu_dereference_protected(tp->next, 1);
+			tp_next = rtnl_dereference(tp->next);
 			if (tp->prio == (prio << 16)) {
 				ret = QDISC_FILTER_PRIO_MATCH;
 				break;
@@ -406,7 +404,6 @@ __osif_check_for_prio_filter_in_clsact_qdisc(struct tcf_block *block,
 			break;
 	}
 	mutex_unlock(&block->lock);
-	rtnl_unlock();
 
 	return ret;
 }
@@ -484,13 +481,14 @@ osif_dp_rx_check_qdisc_configured(qdf_netdev_t ndev, uint32_t prio)
 	if (!dev->ingress_queue)
 		goto reset_wl;
 
-	rcu_read_lock();
+	if (!rtnl_trylock())
+		return QDF_STATUS_E_AGAIN;
 
-	ingress_q = rcu_dereference(dev->ingress_queue);
+	ingress_q = rtnl_dereference(dev->ingress_queue);
 	if (qdf_unlikely(!ingress_q))
 		goto reset;
 
-	ingress_qdisc = rcu_dereference(ingress_q->qdisc);
+	ingress_qdisc = rtnl_dereference(ingress_q->qdisc);
 	if (qdf_unlikely(!ingress_qdisc))
 		goto reset;
 
@@ -501,23 +499,19 @@ osif_dp_rx_check_qdisc_configured(qdf_netdev_t ndev, uint32_t prio)
 								  ingress_qdisc,
 								  prio);
 
-		if (status == QDISC_FILTER_RTNL_LOCK_FAIL) {
-			rcu_read_unlock();
-			return QDF_STATUS_E_AGAIN;
-		} else if (status == QDISC_FILTER_PRIO_MISMATCH) {
+		if (status == QDISC_FILTER_PRIO_MISMATCH)
 			goto reset;
-		}
 
 		disable_gro = true;
 	}
 
 	if (disable_gro) {
-		rcu_read_unlock();
+		rtnl_unlock();
 		return QDF_STATUS_SUCCESS;
 	}
 
 reset:
-	rcu_read_unlock();
+	rtnl_unlock();
 
 reset_wl:
 	return QDF_STATUS_E_NOSUPPORT;