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hw/rdma: Protect against concurrent execution of poll_cq

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The function rdma_poll_cq is called from two contexts - completion
handler thread which sense new completion on backend channel and
explicitly as result of guest issuing poll_cq command.

Add lock to protect against concurrent executions.

Signed-off-by: Yuval Shaia <yuval.shaia@oracle.com>
Reviewed-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Message-Id: <1552300155-25216-4-git-send-email-yuval.shaia@oracle.com>
Reviewed-by: Kamal Heib <kamalheib1@gmail.com>
Signed-off-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
This commit is contained in:
Yuval Shaia 2019-03-11 03:29:07 -07:00 • committed by Marcel Apfelbaum
parent b20fc79510
commit 2cfa953009
3 changed files with 7 additions and 0 deletions
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2
hw/rdma/rdma_backend.c
View file

@ -70,6 +70,7 @@ static void rdma_poll_cq(RdmaDeviceResources *rdma_dev_res, struct ibv_cq *ibcq)
BackendCtx *bctx;
struct ibv_wc wc[2];
qemu_mutex_lock(&rdma_dev_res->lock);
do {
ne = ibv_poll_cq(ibcq, ARRAY_SIZE(wc), wc);
@ -89,6 +90,7 @@ static void rdma_poll_cq(RdmaDeviceResources *rdma_dev_res, struct ibv_cq *ibcq)
g_free(bctx);
}
} while (ne > 0);
qemu_mutex_unlock(&rdma_dev_res->lock);
if (ne < 0) {
rdma_error_report("ibv_poll_cq fail, rc=%d, errno=%d", ne, errno);