tls: rx: don't track the async count

We track both if the last record was handled by async crypto
and how many records were async. This is not necessary. We
implicitly assume once crypto goes async it will stay that
way, otherwise we'd reorder records. So just track if we're
in async mode, the exact number of records is not necessary.

This change also forces us into "async" mode more consistently
in case crypto ever decided to interleave async and sync.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tls/tls_sw.c

@@ -1751,13 +1751,13 @@ int tls_sw_recvmsg(struct sock *sk,
 	struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
 	struct tls_prot_info *prot = &tls_ctx->prot_info;
 	struct sk_psock *psock;
-	int num_async, pending;
 	unsigned char control = 0;
 	ssize_t decrypted = 0;
 	struct strp_msg *rxm;
 	struct tls_msg *tlm;
 	struct sk_buff *skb;
 	ssize_t copied = 0;
+	bool async = false;
 	int target, err = 0;
 	long timeo;
 	bool is_kvec = iov_iter_is_kvec(&msg->msg_iter);
@@ -1789,12 +1789,10 @@ int tls_sw_recvmsg(struct sock *sk,
 	timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
 
 	decrypted = 0;
-	num_async = 0;
 	while (len && (decrypted + copied < target || ctx->recv_pkt)) {
 		struct tls_decrypt_arg darg = {};
 		bool retain_skb = false;
 		int to_decrypt, chunk;
-		bool async;
 
 		skb = tls_wait_data(sk, psock, flags & MSG_DONTWAIT, timeo, &err);
 		if (!skb) {
@@ -1834,10 +1832,8 @@ int tls_sw_recvmsg(struct sock *sk,
 			goto recv_end;
 		}
 
-		if (err == -EINPROGRESS) {
+		if (err == -EINPROGRESS)
 			async = true;
-			num_async++;
-		}
 
 		/* If the type of records being processed is not known yet,
 		 * set it to record type just dequeued. If it is already known,
@@ -1911,7 +1907,9 @@ int tls_sw_recvmsg(struct sock *sk,
 	}
 
 recv_end:
-	if (num_async) {
+	if (async) {
+		int pending;
+
 		/* Wait for all previously submitted records to be decrypted */
 		spin_lock_bh(&ctx->decrypt_compl_lock);
 		reinit_completion(&ctx->async_wait.completion);