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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH net-next 05/32] rxrpc: Convert call->recvmsg_lock to a spinlock From: David Howells To: netdev@vger.kernel.org Cc: Marc Dionne , linux-afs@lists.infradead.org, dhowells@redhat.com, linux-afs@lists.infradead.org, linux-kernel@vger.kernel.org Date: Tue, 06 Dec 2022 15:59:16 +0000 Message-ID: <167034235675.1105287.3642482133403716968.stgit@warthog.procyon.org.uk> In-Reply-To: <167034231605.1105287.1693064952174322878.stgit@warthog.procyon.org.uk> References: <167034231605.1105287.1693064952174322878.stgit@warthog.procyon.org.uk> User-Agent: StGit/1.5 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.10 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Convert call->recvmsg_lock to a spinlock as it's only ever write-locked. Signed-off-by: David Howells cc: Marc Dionne cc: linux-afs@lists.infradead.org --- net/rxrpc/af_rxrpc.c | 2 +- net/rxrpc/ar-internal.h | 2 +- net/rxrpc/call_object.c | 4 ++-- net/rxrpc/recvmsg.c | 12 ++++++------ 4 files changed, 10 insertions(+), 10 deletions(-) diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c index 7ea576f6ba4b..b9dadc89fede 100644 --- a/net/rxrpc/af_rxrpc.c +++ b/net/rxrpc/af_rxrpc.c @@ -783,7 +783,7 @@ static int rxrpc_create(struct net *net, struct socket = *sock, int protocol, INIT_LIST_HEAD(&rx->sock_calls); INIT_LIST_HEAD(&rx->to_be_accepted); INIT_LIST_HEAD(&rx->recvmsg_q); - rwlock_init(&rx->recvmsg_lock); + spin_lock_init(&rx->recvmsg_lock); rwlock_init(&rx->call_lock); memset(&rx->srx, 0, sizeof(rx->srx)); =20 diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h index cb227b85aae1..423f2e1eddb3 100644 --- a/net/rxrpc/ar-internal.h +++ b/net/rxrpc/ar-internal.h @@ -154,7 +154,7 @@ struct rxrpc_sock { struct list_head sock_calls; /* List of calls owned by this socket */ struct list_head to_be_accepted; /* calls awaiting acceptance */ struct list_head recvmsg_q; /* Calls awaiting recvmsg's attention */ - rwlock_t recvmsg_lock; /* Lock for recvmsg_q */ + spinlock_t recvmsg_lock; /* Lock for recvmsg_q */ struct key *key; /* security for this socket */ struct key *securities; /* list of server security descriptors */ struct rb_root calls; /* User ID -> call mapping */ diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c index 89dcf60b1158..36cc868b8922 100644 --- a/net/rxrpc/call_object.c +++ b/net/rxrpc/call_object.c @@ -538,7 +538,7 @@ void rxrpc_release_call(struct rxrpc_sock *rx, struct r= xrpc_call *call) del_timer_sync(&call->timer); =20 /* Make sure we don't get any more notifications */ - write_lock(&rx->recvmsg_lock); + spin_lock(&rx->recvmsg_lock); =20 if (!list_empty(&call->recvmsg_link)) { _debug("unlinking once-pending call %p { e=3D%lx f=3D%lx }", @@ -551,7 +551,7 @@ void rxrpc_release_call(struct rxrpc_sock *rx, struct r= xrpc_call *call) call->recvmsg_link.next =3D NULL; call->recvmsg_link.prev =3D NULL; =20 - write_unlock(&rx->recvmsg_lock); + spin_unlock(&rx->recvmsg_lock); if (put) rxrpc_put_call(call, rxrpc_call_put_unnotify); =20 diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c index 36b25d003cf0..0cde2b477711 100644 --- a/net/rxrpc/recvmsg.c +++ b/net/rxrpc/recvmsg.c @@ -40,12 +40,12 @@ void rxrpc_notify_socket(struct rxrpc_call *call) call->notify_rx(sk, call, call->user_call_ID); spin_unlock(&call->notify_lock); } else { - write_lock(&rx->recvmsg_lock); + spin_lock(&rx->recvmsg_lock); if (list_empty(&call->recvmsg_link)) { rxrpc_get_call(call, rxrpc_call_get_notify_socket); list_add_tail(&call->recvmsg_link, &rx->recvmsg_q); } - write_unlock(&rx->recvmsg_lock); + spin_unlock(&rx->recvmsg_lock); =20 if (!sock_flag(sk, SOCK_DEAD)) { _debug("call %ps", sk->sk_data_ready); @@ -441,14 +441,14 @@ int rxrpc_recvmsg(struct socket *sock, struct msghdr = *msg, size_t len, /* Find the next call and dequeue it if we're not just peeking. If we * do dequeue it, that comes with a ref that we will need to release. */ - write_lock(&rx->recvmsg_lock); + spin_lock(&rx->recvmsg_lock); l =3D rx->recvmsg_q.next; call =3D list_entry(l, struct rxrpc_call, recvmsg_link); if (!(flags & MSG_PEEK)) list_del_init(&call->recvmsg_link); else rxrpc_get_call(call, rxrpc_call_get_recvmsg); - write_unlock(&rx->recvmsg_lock); + spin_unlock(&rx->recvmsg_lock); =20 trace_rxrpc_recvmsg(call, rxrpc_recvmsg_dequeue, 0); =20 @@ -536,9 +536,9 @@ int rxrpc_recvmsg(struct socket *sock, struct msghdr *m= sg, size_t len, =20 error_requeue_call: if (!(flags & MSG_PEEK)) { - write_lock(&rx->recvmsg_lock); + spin_lock(&rx->recvmsg_lock); list_add(&call->recvmsg_link, &rx->recvmsg_q); - write_unlock(&rx->recvmsg_lock); + spin_unlock(&rx->recvmsg_lock); trace_rxrpc_recvmsg(call, rxrpc_recvmsg_requeue, 0); } else { rxrpc_put_call(call, rxrpc_call_put_recvmsg);