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net: qrtr: Release distant nodes along the bridge node

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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@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Loic Poulain 2020-11-06 18:33:30 +01:00 committed by Jakub Kicinski
parent f7dec6cb91
commit 90829f07ba
1 changed files with 19 additions and 6 deletions
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25
net/qrtr/qrtr.c
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@ -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);
@ -602,6 +607,7 @@ 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);
@ -609,11 +615,18 @@ 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);