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tls: rx: simplify async wait

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commit 37943f047b upstream.

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>
Stable-dep-of: aec7961916 ("tls: fix race between async notify and socket close")
Signed-off-by: Shaoying Xu <shaoyi@amazon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jakub Kicinski 2022-04-08 11:31:27 -07:00 committed by Greg Kroah-Hartman
parent cc4fac519d
commit 704402f913
2 changed files with 2 additions and 13 deletions
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1
include/net/tls.h
View file

@ -150,7 +150,6 @@ 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 {

14
net/tls/tls_sw.c
View file

@ -174,7 +174,6 @@ 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);
@ -222,9 +221,7 @@ 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);
}
@ -1917,7 +1914,7 @@ int tls_sw_recvmsg(struct sock *sk,
/* 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) {
@ -1929,15 +1926,8 @@ int tls_sw_recvmsg(struct sock *sk,
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, copied,