net/tls: Replace TLS_RX_SYNC_RUNNING with RCU
stable inclusion from stable-5.10.43 commit 874ece252ed269f5ac1f55167a3f2735ab0f249f bugzilla: 109284 CVE: NA -------------------------------- [ Upstream commit 05fc8b6c ] RCU synchronization is guaranteed to finish in finite time, unlike a busy loop that polls a flag. This patch is a preparation for the bugfix in the next patch, where the same synchronize_net() call will also be used to sync with the TX datapath. Signed-off-by: NMaxim Mikityanskiy <maximmi@nvidia.com> Reviewed-by: NTariq Toukan <tariqt@nvidia.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net> Signed-off-by: NSasha Levin <sashal@kernel.org> Signed-off-by: NChen Jun <chenjun102@huawei.com> Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
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