netdev - [PATCH v2 5/5] net: qrtr: Release distant nodes along the bridge node

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Date:   Fri,  6 Nov 2020 18:33:30 +0100
From:   Loic Poulain <loic.poulain@...aro.org>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     bjorn.andersson@...aro.org, manivannan.sadhasivam@...aro.org,
        cjhuang@...eaurora.org, netdev@...r.kernel.org,
        Loic Poulain <loic.poulain@...aro.org>
Subject: [PATCH v2 5/5] net: qrtr: Release distant nodes along the bridge node

Distant QRTR nodes can be accessed via an other node that acts as
a bridge. When the a QRTR endpoint associated to a bridge node is
released, all the linked distant nodes should also be released.

This patch fixes endpoint release by:
- Submitting QRTR BYE message locally on behalf of all the nodes
accessible through the endpoint.
- Removing all the routable node IDs from radix tree pointing to
the released node endpoint.

Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
---
 net/qrtr/qrtr.c | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c
index a05d01e..e361de5 100644
--- a/net/qrtr/qrtr.c
+++ b/net/qrtr/qrtr.c
@@ -171,8 +171,13 @@ static void __qrtr_node_release(struct kref *kref)
 	void __rcu **slot;
 
 	spin_lock_irqsave(&qrtr_nodes_lock, flags);
-	if (node->nid != QRTR_EP_NID_AUTO)
-		radix_tree_delete(&qrtr_nodes, node->nid);
+	/* If the node is a bridge for other nodes, there are possibly
+	 * multiple entries pointing to our released node, delete them all.
+	 */
+	radix_tree_for_each_slot(slot, &qrtr_nodes, &iter, 0) {
+		if (*slot == node)
+			radix_tree_iter_delete(&qrtr_nodes, &iter, slot);
+	}
 	spin_unlock_irqrestore(&qrtr_nodes_lock, flags);
 
 	list_del(&node->item);
@@ -601,6 +606,7 @@ void qrtr_endpoint_unregister(struct qrtr_endpoint *ep)
 	struct qrtr_ctrl_pkt *pkt;
 	struct qrtr_tx_flow *flow;
 	struct sk_buff *skb;
+	unsigned long flags;
 	void __rcu **slot;
 
 	mutex_lock(&node->ep_lock);
@@ -608,11 +614,18 @@ void qrtr_endpoint_unregister(struct qrtr_endpoint *ep)
 	mutex_unlock(&node->ep_lock);
 
 	/* Notify the local controller about the event */
-	skb = qrtr_alloc_ctrl_packet(&pkt, GFP_KERNEL);
-	if (skb) {
-		pkt->cmd = cpu_to_le32(QRTR_TYPE_BYE);
-		qrtr_local_enqueue(NULL, skb, QRTR_TYPE_BYE, &src, &dst);
+	spin_lock_irqsave(&qrtr_nodes_lock, flags);
+	radix_tree_for_each_slot(slot, &qrtr_nodes, &iter, 0) {
+		if (*slot != node)
+			continue;
+		src.sq_node = iter.index;
+		skb = qrtr_alloc_ctrl_packet(&pkt, GFP_ATOMIC);
+		if (skb) {
+			pkt->cmd = cpu_to_le32(QRTR_TYPE_BYE);
+			qrtr_local_enqueue(NULL, skb, QRTR_TYPE_BYE, &src, &dst);
+		}
 	}
+	spin_unlock_irqrestore(&qrtr_nodes_lock, flags);
 
 	/* Wake up any transmitters waiting for resume-tx from the node */
 	mutex_lock(&node->qrtr_tx_lock);
-- 
2.7.4