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net: remove noblock parameter from skb_recv_datagram()

Browse Source 
skb_recv_datagram() has two parameters 'flags' and 'noblock' that are
merged inside skb_recv_datagram() by 'flags | (noblock ? MSG_DONTWAIT : 0)'

As 'flags' may contain MSG_DONTWAIT as value most callers split the 'flags'
into 'flags' and 'noblock' with finally obsolete bit operations like this:

skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &rc);

And this is not even done consistently with the 'flags' parameter.

This patch removes the obsolete and costly splitting into two parameters
and only performs bit operations when really needed on the caller side.

One missing conversion thankfully reported by kernel test robot. I missed
to enable kunit tests to build the mctp code.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Oliver Hartkopp 2022-04-04 18:30:22 +02:00 committed by David S. Miller
parent 0b5c21bbc0
commit f4b41f062c
37 changed files with 57 additions and 70 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/isdn/mISDN/socket.c
View File

@ -121,7 +121,7 @@ mISDN_sock_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
if (sk->sk_state == MISDN_CLOSED)
return 0;
skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
skb = skb_recv_datagram(sk, flags, &err);
if (!skb)
return err;

3
drivers/net/ppp/pppoe.c
View File

@ -1011,8 +1011,7 @@ static int pppoe_recvmsg(struct socket *sock, struct msghdr *m,
goto end;
}
skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
flags & MSG_DONTWAIT, &error);
skb = skb_recv_datagram(sk, flags, &error);
if (error < 0)
goto end;

3
include/linux/skbuff.h
View File

@ -3836,8 +3836,7 @@ struct sk_buff *__skb_try_recv_datagram(struct sock *sk,
struct sk_buff *__skb_recv_datagram(struct sock *sk,
struct sk_buff_head *sk_queue,
unsigned int flags, int *off, int *err);
struct sk_buff *skb_recv_datagram(struct sock *sk, unsigned flags, int noblock,
int *err);
struct sk_buff *skb_recv_datagram(struct sock *sk, unsigned int flags, int *err);
__poll_t datagram_poll(struct file *file, struct socket *sock,
struct poll_table_struct *wait);
int skb_copy_datagram_iter(const struct sk_buff *from, int offset,

3
net/appletalk/ddp.c
View File

@ -1753,8 +1753,7 @@ static int atalk_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
int err = 0;
struct sk_buff *skb;
skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
flags & MSG_DONTWAIT, &err);
skb = skb_recv_datagram(sk, flags, &err);
lock_sock(sk);
if (!skb)

2
net/atm/common.c
View File

@ -540,7 +540,7 @@ int vcc_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
!test_bit(ATM_VF_READY, &vcc->flags))
return 0;
skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error);
skb = skb_recv_datagram(sk, flags, &error);
if (!skb)
return error;

3
net/ax25/af_ax25.c
View File

@ -1669,8 +1669,7 @@ static int ax25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
}
/* Now we can treat all alike */
skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
flags & MSG_DONTWAIT, &err);
skb = skb_recv_datagram(sk, flags, &err);
if (skb == NULL)
goto out;

3
net/bluetooth/af_bluetooth.c
View File

@ -251,7 +251,6 @@ EXPORT_SYMBOL(bt_accept_dequeue);
int bt_sock_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
int flags)
{
int noblock = flags & MSG_DONTWAIT;
struct sock *sk = sock->sk;
struct sk_buff *skb;
size_t copied;
@ -263,7 +262,7 @@ int bt_sock_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
if (flags & MSG_OOB)
return -EOPNOTSUPP;
skb = skb_recv_datagram(sk, flags, noblock, &err);
skb = skb_recv_datagram(sk, flags, &err);
if (!skb) {
if (sk->sk_shutdown & RCV_SHUTDOWN)
return 0;

3
net/bluetooth/hci_sock.c
View File

@ -1453,7 +1453,6 @@ static void hci_sock_cmsg(struct sock *sk, struct msghdr *msg,
static int hci_sock_recvmsg(struct socket *sock, struct msghdr *msg,
size_t len, int flags)
{
int noblock = flags & MSG_DONTWAIT;
struct sock *sk = sock->sk;
struct sk_buff *skb;
int copied, err;
@ -1470,7 +1469,7 @@ static int hci_sock_recvmsg(struct socket *sock, struct msghdr *msg,
if (sk->sk_state == BT_CLOSED)
return 0;
skb = skb_recv_datagram(sk, flags, noblock, &err);
skb = skb_recv_datagram(sk, flags, &err);
if (!skb)
return err;

2
net/caif/caif_socket.c
View File

@ -282,7 +282,7 @@ static int caif_seqpkt_recvmsg(struct socket *sock, struct msghdr *m,
if (flags & MSG_OOB)
goto read_error;
skb = skb_recv_datagram(sk, flags, 0 , &ret);
skb = skb_recv_datagram(sk, flags, &ret);
if (!skb)
goto read_error;
copylen = skb->len;

5
net/can/bcm.c
View File

@ -1632,12 +1632,9 @@ static int bcm_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
struct sock *sk = sock->sk;
struct sk_buff *skb;
int error = 0;
int noblock;
int err;
noblock = flags & MSG_DONTWAIT;
flags &= ~MSG_DONTWAIT;
skb = skb_recv_datagram(sk, flags, noblock, &error);
skb = skb_recv_datagram(sk, flags, &error);
if (!skb)
return error;

4
net/can/isotp.c
View File

@ -1047,7 +1047,6 @@ static int isotp_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
struct sock *sk = sock->sk;
struct sk_buff *skb;
struct isotp_sock *so = isotp_sk(sk);
int noblock = flags & MSG_DONTWAIT;
int ret = 0;
if (flags & ~(MSG_DONTWAIT | MSG_TRUNC | MSG_PEEK))
@ -1056,8 +1055,7 @@ static int isotp_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
if (!so->bound)
return -EADDRNOTAVAIL;
flags &= ~MSG_DONTWAIT;
skb = skb_recv_datagram(sk, flags, noblock, &ret);
skb = skb_recv_datagram(sk, flags, &ret);
if (!skb)
return ret;

2
net/can/j1939/socket.c
View File

@ -802,7 +802,7 @@ static int j1939_sk_recvmsg(struct socket *sock, struct msghdr *msg,
return sock_recv_errqueue(sock->sk, msg, size, SOL_CAN_J1939,
SCM_J1939_ERRQUEUE);
skb = skb_recv_datagram(sk, flags, 0, &ret);
skb = skb_recv_datagram(sk, flags, &ret);
if (!skb)
return ret;

6
net/can/raw.c
View File

@ -846,16 +846,12 @@ static int raw_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
struct sock *sk = sock->sk;
struct sk_buff *skb;
int err = 0;
int noblock;
noblock = flags & MSG_DONTWAIT;
flags &= ~MSG_DONTWAIT;
if (flags & MSG_ERRQUEUE)
return sock_recv_errqueue(sk, msg, size,
SOL_CAN_RAW, SCM_CAN_RAW_ERRQUEUE);
skb = skb_recv_datagram(sk, flags, noblock, &err);
skb = skb_recv_datagram(sk, flags, &err);
if (!skb)
return err;

5
net/core/datagram.c
View File

@ -310,12 +310,11 @@ struct sk_buff *__skb_recv_datagram(struct sock *sk,
EXPORT_SYMBOL(__skb_recv_datagram);
struct sk_buff *skb_recv_datagram(struct sock *sk, unsigned int flags,
int noblock, int *err)
int *err)
{
int off = 0;
return __skb_recv_datagram(sk, &sk->sk_receive_queue,
flags | (noblock ? MSG_DONTWAIT : 0),
return __skb_recv_datagram(sk, &sk->sk_receive_queue, flags,
&off, err);
}
EXPORT_SYMBOL(skb_recv_datagram);

6
net/ieee802154/socket.c
View File

@ -314,7 +314,8 @@ static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
int err = -EOPNOTSUPP;
struct sk_buff *skb;
skb = skb_recv_datagram(sk, flags, noblock, &err);
flags |= (noblock ? MSG_DONTWAIT : 0);
skb = skb_recv_datagram(sk, flags, &err);
if (!skb)
goto out;
@ -703,7 +704,8 @@ static int dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
struct dgram_sock *ro = dgram_sk(sk);
DECLARE_SOCKADDR(struct sockaddr_ieee802154 *, saddr, msg->msg_name);
skb = skb_recv_datagram(sk, flags, noblock, &err);
flags |= (noblock ? MSG_DONTWAIT : 0);
skb = skb_recv_datagram(sk, flags, &err);
if (!skb)
goto out;

3
net/ipv4/ping.c
View File

@ -861,7 +861,8 @@ int ping_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock,
if (flags & MSG_ERRQUEUE)
return inet_recv_error(sk, msg, len, addr_len);
skb = skb_recv_datagram(sk, flags, noblock, &err);
flags |= (noblock ? MSG_DONTWAIT : 0);
skb = skb_recv_datagram(sk, flags, &err);
if (!skb)
goto out;

3
net/ipv4/raw.c
View File

@ -769,7 +769,8 @@ static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
goto out;
}
skb = skb_recv_datagram(sk, flags, noblock, &err);
flags |= (noblock ? MSG_DONTWAIT : 0);
skb = skb_recv_datagram(sk, flags, &err);
if (!skb)
goto out;

3
net/ipv6/raw.c
View File

@ -477,7 +477,8 @@ static int rawv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
if (np->rxpmtu && np->rxopt.bits.rxpmtu)
return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
skb = skb_recv_datagram(sk, flags, noblock, &err);
flags |= (noblock ? MSG_DONTWAIT : 0);
skb = skb_recv_datagram(sk, flags, &err);
if (!skb)
goto out;

3
net/iucv/af_iucv.c
View File

@ -1223,7 +1223,6 @@ static void iucv_process_message_q(struct sock *sk)
static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
size_t len, int flags)
{
int noblock = flags & MSG_DONTWAIT;
struct sock *sk = sock->sk;
struct iucv_sock *iucv = iucv_sk(sk);
unsigned int copied, rlen;
@ -1242,7 +1241,7 @@ static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
/* receive/dequeue next skb:
* the function understands MSG_PEEK and, thus, does not dequeue skb */
skb = skb_recv_datagram(sk, flags, noblock, &err);
skb = skb_recv_datagram(sk, flags, &err);
if (!skb) {
if (sk->sk_shutdown & RCV_SHUTDOWN)
return 0;

2
net/key/af_key.c
View File

@ -3696,7 +3696,7 @@ static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
goto out;
skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
skb = skb_recv_datagram(sk, flags, &err);
if (skb == NULL)
goto out;

3
net/l2tp/l2tp_ip.c
View File

@ -526,7 +526,8 @@ static int l2tp_ip_recvmsg(struct sock *sk, struct msghdr *msg,
if (flags & MSG_OOB)
goto out;
skb = skb_recv_datagram(sk, flags, noblock, &err);
flags |= (noblock ? MSG_DONTWAIT : 0);
skb = skb_recv_datagram(sk, flags, &err);
if (!skb)
goto out;

3
net/l2tp/l2tp_ip6.c
View File

@ -671,7 +671,8 @@ static int l2tp_ip6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
if (flags & MSG_ERRQUEUE)
return ipv6_recv_error(sk, msg, len, addr_len);
skb = skb_recv_datagram(sk, flags, noblock, &err);
flags |= (noblock ? MSG_DONTWAIT : 0);
skb = skb_recv_datagram(sk, flags, &err);
if (!skb)
goto out;

3
net/l2tp/l2tp_ppp.c
View File

@ -191,8 +191,7 @@ static int pppol2tp_recvmsg(struct socket *sock, struct msghdr *msg,
goto end;
err = 0;
skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
flags & MSG_DONTWAIT, &err);
skb = skb_recv_datagram(sk, flags, &err);
if (!skb)
goto end;

2
net/mctp/af_mctp.c
View File

@ -196,7 +196,7 @@ static int mctp_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
if (flags & ~(MSG_DONTWAIT | MSG_TRUNC | MSG_PEEK))
return -EOPNOTSUPP;
skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &rc);
skb = skb_recv_datagram(sk, flags, &rc);
if (!skb)
return rc;

8
net/mctp/test/route-test.c
View File

@ -352,7 +352,7 @@ static void mctp_test_route_input_sk(struct kunit *test)
if (params->deliver) {
KUNIT_EXPECT_EQ(test, rc, 0);
skb2 = skb_recv_datagram(sock->sk, 0, 1, &rc);
skb2 = skb_recv_datagram(sock->sk, MSG_DONTWAIT, &rc);
KUNIT_EXPECT_NOT_ERR_OR_NULL(test, skb2);
KUNIT_EXPECT_EQ(test, skb->len, 1);
@ -360,7 +360,7 @@ static void mctp_test_route_input_sk(struct kunit *test)
} else {
KUNIT_EXPECT_NE(test, rc, 0);
skb2 = skb_recv_datagram(sock->sk, 0, 1, &rc);
skb2 = skb_recv_datagram(sock->sk, MSG_DONTWAIT, &rc);
KUNIT_EXPECT_PTR_EQ(test, skb2, NULL);
}
@ -423,7 +423,7 @@ static void mctp_test_route_input_sk_reasm(struct kunit *test)
rc = mctp_route_input(&rt->rt, skb);
}
skb2 = skb_recv_datagram(sock->sk, 0, 1, &rc);
skb2 = skb_recv_datagram(sock->sk, MSG_DONTWAIT, &rc);
if (params->rx_len) {
KUNIT_EXPECT_NOT_ERR_OR_NULL(test, skb2);
@ -582,7 +582,7 @@ static void mctp_test_route_input_sk_keys(struct kunit *test)
rc = mctp_route_input(&rt->rt, skb);
/* (potentially) receive message */
skb2 = skb_recv_datagram(sock->sk, 0, 1, &rc);
skb2 = skb_recv_datagram(sock->sk, MSG_DONTWAIT, &rc);
if (params->deliver)
KUNIT_EXPECT_NOT_ERR_OR_NULL(test, skb2);

3
net/netlink/af_netlink.c
View File

@ -1931,7 +1931,6 @@ static int netlink_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
struct scm_cookie scm;
struct sock *sk = sock->sk;
struct netlink_sock *nlk = nlk_sk(sk);
int noblock = flags & MSG_DONTWAIT;
size_t copied;
struct sk_buff *skb, *data_skb;
int err, ret;
@ -1941,7 +1940,7 @@ static int netlink_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
copied = 0;
skb = skb_recv_datagram(sk, flags, noblock, &err);
skb = skb_recv_datagram(sk, flags, &err);
if (skb == NULL)
goto out;

3
net/netrom/af_netrom.c
View File

@ -1159,7 +1159,8 @@ static int nr_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
}
/* Now we can treat all alike */
if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
skb = skb_recv_datagram(sk, flags, &er);
if (!skb) {
release_sock(sk);
return er;
}

3
net/nfc/llcp_sock.c
View File

@ -821,7 +821,6 @@ static int llcp_sock_sendmsg(struct socket *sock, struct msghdr *msg,
static int llcp_sock_recvmsg(struct socket *sock, struct msghdr *msg,
size_t len, int flags)
{
int noblock = flags & MSG_DONTWAIT;
struct sock *sk = sock->sk;
unsigned int copied, rlen;
struct sk_buff *skb, *cskb;
@ -842,7 +841,7 @@ static int llcp_sock_recvmsg(struct socket *sock, struct msghdr *msg,
if (flags & (MSG_OOB))
return -EOPNOTSUPP;
skb = skb_recv_datagram(sk, flags, noblock, &err);
skb = skb_recv_datagram(sk, flags, &err);
if (!skb) {
pr_err("Recv datagram failed state %d %d %d",
sk->sk_state, err, sock_error(sk));

3
net/nfc/rawsock.c
View File

@ -238,7 +238,6 @@ static int rawsock_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
static int rawsock_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
int flags)
{
int noblock = flags & MSG_DONTWAIT;
struct sock *sk = sock->sk;
struct sk_buff *skb;
int copied;
@ -246,7 +245,7 @@ static int rawsock_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
pr_debug("sock=%p sk=%p len=%zu flags=%d\n", sock, sk, len, flags);
skb = skb_recv_datagram(sk, flags, noblock, &rc);
skb = skb_recv_datagram(sk, flags, &rc);
if (!skb)
return rc;

2
net/packet/af_packet.c
View File

@ -3421,7 +3421,7 @@ static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
* but then it will block.
*/
skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
skb = skb_recv_datagram(sk, flags, &err);
/*
* An error occurred so return it. Because skb_recv_datagram()

3
net/phonet/datagram.c
View File

@ -123,7 +123,8 @@ static int pn_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
MSG_CMSG_COMPAT))
goto out_nofree;
skb = skb_recv_datagram(sk, flags, noblock, &rval);
flags |= (noblock ? MSG_DONTWAIT : 0);
skb = skb_recv_datagram(sk, flags, &rval);
if (skb == NULL)
goto out_nofree;

6
net/phonet/pep.c
View File

@ -772,7 +772,8 @@ static struct sock *pep_sock_accept(struct sock *sk, int flags, int *errp,
u8 pipe_handle, enabled, n_sb;
u8 aligned = 0;
skb = skb_recv_datagram(sk, 0, flags & O_NONBLOCK, errp);
skb = skb_recv_datagram(sk, (flags & O_NONBLOCK) ? MSG_DONTWAIT : 0,
errp);
if (!skb)
return NULL;
@ -1267,7 +1268,8 @@ static int pep_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
return -EINVAL;
}
skb = skb_recv_datagram(sk, flags, noblock, &err);
flags |= (noblock ? MSG_DONTWAIT : 0);
skb = skb_recv_datagram(sk, flags, &err);
lock_sock(sk);
if (skb == NULL) {
if (err == -ENOTCONN && sk->sk_state == TCP_CLOSE_WAIT)

3
net/qrtr/af_qrtr.c
View File

@ -1035,8 +1035,7 @@ static int qrtr_recvmsg(struct socket *sock, struct msghdr *msg,
return -EADDRNOTAVAIL;
}
skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
flags & MSG_DONTWAIT, &rc);
skb = skb_recv_datagram(sk, flags, &rc);
if (!skb) {
release_sock(sk);
return rc;

3
net/rose/af_rose.c
View File

@ -1230,7 +1230,8 @@ static int rose_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
return -ENOTCONN;
/* Now we can treat all alike */
if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL)
skb = skb_recv_datagram(sk, flags, &er);
if (!skb)
return er;
qbit = (skb->data[0] & ROSE_Q_BIT) == ROSE_Q_BIT;

5
net/unix/af_unix.c
View File

@ -1643,7 +1643,8 @@ static int unix_accept(struct socket *sock, struct socket *newsock, int flags,
* so that no locks are necessary.
*/
skb = skb_recv_datagram(sk, 0, flags&O_NONBLOCK, &err);
skb = skb_recv_datagram(sk, (flags & O_NONBLOCK) ? MSG_DONTWAIT : 0,
&err);
if (!skb) {
/* This means receive shutdown. */
if (err == 0)
@ -2500,7 +2501,7 @@ static int unix_read_sock(struct sock *sk, read_descriptor_t *desc,
int used, err;
mutex_lock(&u->iolock);
skb = skb_recv_datagram(sk, 0, 1, &err);
skb = skb_recv_datagram(sk, MSG_DONTWAIT, &err);
mutex_unlock(&u->iolock);
if (!skb)
return err;

5
net/vmw_vsock/vmci_transport.c
View File

@ -1732,19 +1732,16 @@ static int vmci_transport_dgram_dequeue(struct vsock_sock *vsk,
int flags)
{
int err;
int noblock;
struct vmci_datagram *dg;
size_t payload_len;
struct sk_buff *skb;
noblock = flags & MSG_DONTWAIT;
if (flags & MSG_OOB || flags & MSG_ERRQUEUE)
return -EOPNOTSUPP;
/* Retrieve the head sk_buff from the socket's receive queue. */
err = 0;
skb = skb_recv_datagram(&vsk->sk, flags, noblock, &err);
skb = skb_recv_datagram(&vsk->sk, flags, &err);
if (!skb)
return err;

3
net/x25/af_x25.c
View File

@ -1315,8 +1315,7 @@ static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
} else {
/* Now we can treat all alike */
release_sock(sk);
skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
flags & MSG_DONTWAIT, &rc);
skb = skb_recv_datagram(sk, flags, &rc);
lock_sock(sk);
if (!skb)
goto out;