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net: qrtr: Check for exisiting waiters

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Some non-blocking clients may not wait for the OUT event from select or
poll before resending to a flow controlled port. Check for exisiting
waiters before allocating a new one so these clients do not exhaust the
memory pool.

Change-Id: I5fc40d5b1d1819ea5bf94438c04ee42b42639ebc
Signed-off-by: Chris Lew <clew@codeaurora.org>
This commit is contained in:
Chris Lew 2020-04-07 17:46:26 -07:00
commit cdb150a515
1 changed files with 8 additions and 0 deletions
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8
net/qrtr/qrtr.c
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@ -500,6 +500,12 @@ static int qrtr_tx_wait(struct qrtr_node *node, struct sockaddr_qrtr *to,
break;
}
if (!ret) {
list_for_each_entry(waiter, &flow->waiters, node) {
if (waiter->sk == sk) {
mutex_unlock(&node->qrtr_tx_lock);
return -EAGAIN;
}
}
waiter = kzalloc(sizeof(*waiter), GFP_KERNEL);
if (!waiter) {
mutex_unlock(&node->qrtr_tx_lock);
@ -508,6 +514,8 @@ static int qrtr_tx_wait(struct qrtr_node *node, struct sockaddr_qrtr *to,
waiter->sk = sk;
sock_hold(sk);
list_add_tail(&waiter->node, &flow->waiters);
QRTR_INFO(node->ilc, "new waiter for [0x%x:0x%x]\n",
to->sq_node, to->sq_port);
mutex_unlock(&node->qrtr_tx_lock);
return -EAGAIN;
}