diff options
| author | Maxim Mikityanskiy <maximmi@nvidia.com> | 2021-06-01 15:07:59 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-06-10 14:39:17 +0300 |
| commit | 874ece252ed269f5ac1f55167a3f2735ab0f249f (patch) | |
| tree | e98211a22064924325e346033c0c60a5913410c2 /net/tls | |
| parent | a5de17bb916a7f5b2e5b35a7c961ebee6d95bb28 (diff) | |
| download | linux-874ece252ed269f5ac1f55167a3f2735ab0f249f.tar.xz | |
net/tls: Replace TLS_RX_SYNC_RUNNING with RCU
[ Upstream commit 05fc8b6cbd4f979a6f25759c4a17dd5f657f7ecd ]
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: Maxim Mikityanskiy <maximmi@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net/tls')
| -rw-r--r-- | net/tls/tls_device.c | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c index a3ab2d3d4e4e..abc04045577d 100644 --- a/net/tls/tls_device.c +++ b/net/tls/tls_device.c @@ -680,15 +680,13 @@ static void tls_device_resync_rx(struct tls_context *tls_ctx, struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx); struct net_device *netdev; - if (WARN_ON(test_and_set_bit(TLS_RX_SYNC_RUNNING, &tls_ctx->flags))) - return; - trace_tls_device_rx_resync_send(sk, seq, rcd_sn, rx_ctx->resync_type); + rcu_read_lock(); netdev = READ_ONCE(tls_ctx->netdev); if (netdev) netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, rcd_sn, TLS_OFFLOAD_CTX_DIR_RX); - clear_bit_unlock(TLS_RX_SYNC_RUNNING, &tls_ctx->flags); + rcu_read_unlock(); TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICERESYNC); } @@ -1298,9 +1296,7 @@ static int tls_device_down(struct net_device *netdev) netdev->tlsdev_ops->tls_dev_del(netdev, ctx, TLS_OFFLOAD_CTX_DIR_RX); WRITE_ONCE(ctx->netdev, NULL); - smp_mb__before_atomic(); /* pairs with test_and_set_bit() */ - while (test_bit(TLS_RX_SYNC_RUNNING, &ctx->flags)) - usleep_range(10, 200); + synchronize_net(); dev_put(netdev); list_del_init(&ctx->list); |