From: Jakub Kicinski <kuba@kernel.org>
Date: Fri, 8 Apr 2022 18:31:27 +0000 (-0700)
Subject: tls: rx: simplify async wait
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=37943f047bfb88ba4dfc7a522563f57c86d088a0;p=linux.git

tls: rx: simplify async wait

Since we are protected from async completions by decrypt_compl_lock
we can drop the async_notify and reinit the completion before we
start waiting.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/include/net/tls.h b/include/net/tls.h
index a01c264e5f157..6fe78361c8c84 100644
--- a/include/net/tls.h
+++ b/include/net/tls.h
@@ -152,7 +152,6 @@ struct tls_sw_context_rx {
 	atomic_t decrypt_pending;
 	/* protect crypto_wait with decrypt_pending*/
 	spinlock_t decrypt_compl_lock;
-	bool async_notify;
 };
 
 struct tls_record_info {
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index ecf9a38327984..003f7c178cdef 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -173,7 +173,6 @@ static void tls_decrypt_done(struct crypto_async_request *req, int err)
 	struct scatterlist *sg;
 	struct sk_buff *skb;
 	unsigned int pages;
-	int pending;
 
 	skb = (struct sk_buff *)req->data;
 	tls_ctx = tls_get_ctx(skb->sk);
@@ -221,9 +220,7 @@ static void tls_decrypt_done(struct crypto_async_request *req, int err)
 	kfree(aead_req);
 
 	spin_lock_bh(&ctx->decrypt_compl_lock);
-	pending = atomic_dec_return(&ctx->decrypt_pending);
-
-	if (!pending && ctx->async_notify)
+	if (!atomic_dec_return(&ctx->decrypt_pending))
 		complete(&ctx->async_wait.completion);
 	spin_unlock_bh(&ctx->decrypt_compl_lock);
 }
@@ -1940,7 +1937,7 @@ recv_end:
 	if (num_async) {
 		/* Wait for all previously submitted records to be decrypted */
 		spin_lock_bh(&ctx->decrypt_compl_lock);
-		ctx->async_notify = true;
+		reinit_completion(&ctx->async_wait.completion);
 		pending = atomic_read(&ctx->decrypt_pending);
 		spin_unlock_bh(&ctx->decrypt_compl_lock);
 		if (pending) {
@@ -1952,15 +1949,8 @@ recv_end:
 				decrypted = 0;
 				goto end;
 			}
-		} else {
-			reinit_completion(&ctx->async_wait.completion);
 		}
 
-		/* There can be no concurrent accesses, since we have no
-		 * pending decrypt operations
-		 */
-		WRITE_ONCE(ctx->async_notify, false);
-
 		/* Drain records from the rx_list & copy if required */
 		if (is_peek || is_kvec)
 			err = process_rx_list(ctx, msg, &control, &cmsg, copied,