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Merge pull request #80 from ijc25/vsock

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Update vsock patches
This commit is contained in:
Justin Cormack 2016-04-12 15:02:10 +01:00
commit 0390b2ba4d
9 changed files with 347 additions and 175 deletions
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2
alpine/kernel/patches/0002-VSOCK-constify-vmci_transport_notify_ops-structures.patch
View File

@ -1,4 +1,4 @@
From ba1dc9346ba14b24f22ea04db21011f2874c3a67 Mon Sep 17 00:00:00 2001
From 0260029492a1503e871236767ed86e2fc3862cc2 Mon Sep 17 00:00:00 2001
From: Julia Lawall <julia.lawall@lip6.fr>
Date: Sat, 21 Nov 2015 18:39:17 +0100
Subject: [PATCH 2/9] VSOCK: constify vmci_transport_notify_ops structures

336
alpine/kernel/patches/0003-AF_VSOCK-Shrink-the-area-influenced-by-prepare_to_wa.patch Normal file
View File

@ -0,0 +1,336 @@
From 6a585c01a353551a69af45bf31606f13115480d1 Mon Sep 17 00:00:00 2001
From: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Date: Tue, 22 Mar 2016 17:05:52 +0100
Subject: [PATCH 3/9] AF_VSOCK: Shrink the area influenced by prepare_to_wait
When a thread is prepared for waiting by calling prepare_to_wait, sleeping
is not allowed until either the wait has taken place or finish_wait has
been called. The existing code in af_vsock imposed unnecessary no-sleep
assumptions to a broad list of backend functions.
This patch shrinks the influence of prepare_to_wait to the area where it
is strictly needed, therefore relaxing the no-sleep restriction there.
Signed-off-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit f7f9b5e7f8eccfd68ffa7b8d74b07c478bb9e7f0)
---
net/vmw_vsock/af_vsock.c | 158 +++++++++++++++++++++++++----------------------
1 file changed, 85 insertions(+), 73 deletions(-)
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 7fd1220..3dce53e 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -1209,10 +1209,14 @@ static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr,
if (signal_pending(current)) {
err = sock_intr_errno(timeout);
- goto out_wait_error;
+ sk->sk_state = SS_UNCONNECTED;
+ sock->state = SS_UNCONNECTED;
+ goto out_wait;
} else if (timeout == 0) {
err = -ETIMEDOUT;
- goto out_wait_error;
+ sk->sk_state = SS_UNCONNECTED;
+ sock->state = SS_UNCONNECTED;
+ goto out_wait;
}
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
@@ -1220,20 +1224,17 @@ static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr,
if (sk->sk_err) {
err = -sk->sk_err;
- goto out_wait_error;
- } else
+ sk->sk_state = SS_UNCONNECTED;
+ sock->state = SS_UNCONNECTED;
+ } else {
err = 0;
+ }
out_wait:
finish_wait(sk_sleep(sk), &wait);
out:
release_sock(sk);
return err;
-
-out_wait_error:
- sk->sk_state = SS_UNCONNECTED;
- sock->state = SS_UNCONNECTED;
- goto out_wait;
}
static int vsock_accept(struct socket *sock, struct socket *newsock, int flags)
@@ -1270,18 +1271,20 @@ static int vsock_accept(struct socket *sock, struct socket *newsock, int flags)
listener->sk_err == 0) {
release_sock(listener);
timeout = schedule_timeout(timeout);
+ finish_wait(sk_sleep(listener), &wait);
lock_sock(listener);
if (signal_pending(current)) {
err = sock_intr_errno(timeout);
- goto out_wait;
+ goto out;
} else if (timeout == 0) {
err = -EAGAIN;
- goto out_wait;
+ goto out;
}
prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE);
}
+ finish_wait(sk_sleep(listener), &wait);
if (listener->sk_err)
err = -listener->sk_err;
@@ -1301,19 +1304,15 @@ static int vsock_accept(struct socket *sock, struct socket *newsock, int flags)
*/
if (err) {
vconnected->rejected = true;
- release_sock(connected);
- sock_put(connected);
- goto out_wait;
+ } else {
+ newsock->state = SS_CONNECTED;
+ sock_graft(connected, newsock);
}
- newsock->state = SS_CONNECTED;
- sock_graft(connected, newsock);
release_sock(connected);
sock_put(connected);
}
-out_wait:
- finish_wait(sk_sleep(listener), &wait);
out:
release_sock(listener);
return err;
@@ -1557,11 +1556,11 @@ static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg,
if (err < 0)
goto out;
- prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
while (total_written < len) {
ssize_t written;
+ prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
while (vsock_stream_has_space(vsk) == 0 &&
sk->sk_err == 0 &&
!(sk->sk_shutdown & SEND_SHUTDOWN) &&
@@ -1570,27 +1569,33 @@ static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg,
/* Don't wait for non-blocking sockets. */
if (timeout == 0) {
err = -EAGAIN;
- goto out_wait;
+ finish_wait(sk_sleep(sk), &wait);
+ goto out_err;
}
err = transport->notify_send_pre_block(vsk, &send_data);
- if (err < 0)
- goto out_wait;
+ if (err < 0) {
+ finish_wait(sk_sleep(sk), &wait);
+ goto out_err;
+ }
release_sock(sk);
timeout = schedule_timeout(timeout);
lock_sock(sk);
if (signal_pending(current)) {
err = sock_intr_errno(timeout);
- goto out_wait;
+ finish_wait(sk_sleep(sk), &wait);
+ goto out_err;
} else if (timeout == 0) {
err = -EAGAIN;
- goto out_wait;
+ finish_wait(sk_sleep(sk), &wait);
+ goto out_err;
}
prepare_to_wait(sk_sleep(sk), &wait,
TASK_INTERRUPTIBLE);
}
+ finish_wait(sk_sleep(sk), &wait);
/* These checks occur both as part of and after the loop
* conditional since we need to check before and after
@@ -1598,16 +1603,16 @@ static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg,
*/
if (sk->sk_err) {
err = -sk->sk_err;
- goto out_wait;
+ goto out_err;
} else if ((sk->sk_shutdown & SEND_SHUTDOWN) ||
(vsk->peer_shutdown & RCV_SHUTDOWN)) {
err = -EPIPE;
- goto out_wait;
+ goto out_err;
}
err = transport->notify_send_pre_enqueue(vsk, &send_data);
if (err < 0)
- goto out_wait;
+ goto out_err;
/* Note that enqueue will only write as many bytes as are free
* in the produce queue, so we don't need to ensure len is
@@ -1620,7 +1625,7 @@ static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg,
len - total_written);
if (written < 0) {
err = -ENOMEM;
- goto out_wait;
+ goto out_err;
}
total_written += written;
@@ -1628,14 +1633,13 @@ static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg,
err = transport->notify_send_post_enqueue(
vsk, written, &send_data);
if (err < 0)
- goto out_wait;
+ goto out_err;
}
-out_wait:
+out_err:
if (total_written > 0)
err = total_written;
- finish_wait(sk_sleep(sk), &wait);
out:
release_sock(sk);
return err;
@@ -1716,21 +1720,61 @@ vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
if (err < 0)
goto out;
- prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
while (1) {
- s64 ready = vsock_stream_has_data(vsk);
+ s64 ready;
- if (ready < 0) {
- /* Invalid queue pair content. XXX This should be
- * changed to a connection reset in a later change.
- */
+ prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
+ ready = vsock_stream_has_data(vsk);
- err = -ENOMEM;
- goto out_wait;
- } else if (ready > 0) {
+ if (ready == 0) {
+ if (sk->sk_err != 0 ||
+ (sk->sk_shutdown & RCV_SHUTDOWN) ||
+ (vsk->peer_shutdown & SEND_SHUTDOWN)) {
+ finish_wait(sk_sleep(sk), &wait);
+ break;
+ }
+ /* Don't wait for non-blocking sockets. */
+ if (timeout == 0) {
+ err = -EAGAIN;
+ finish_wait(sk_sleep(sk), &wait);
+ break;
+ }
+
+ err = transport->notify_recv_pre_block(
+ vsk, target, &recv_data);
+ if (err < 0) {
+ finish_wait(sk_sleep(sk), &wait);
+ break;
+ }
+ release_sock(sk);
+ timeout = schedule_timeout(timeout);
+ lock_sock(sk);
+
+ if (signal_pending(current)) {
+ err = sock_intr_errno(timeout);
+ finish_wait(sk_sleep(sk), &wait);
+ break;
+ } else if (timeout == 0) {
+ err = -EAGAIN;
+ finish_wait(sk_sleep(sk), &wait);
+ break;
+ }
+ } else {
ssize_t read;
+ finish_wait(sk_sleep(sk), &wait);
+
+ if (ready < 0) {
+ /* Invalid queue pair content. XXX This should
+ * be changed to a connection reset in a later
+ * change.
+ */
+
+ err = -ENOMEM;
+ goto out;
+ }
+
err = transport->notify_recv_pre_dequeue(
vsk, target, &recv_data);
if (err < 0)
@@ -1750,42 +1794,12 @@ vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
vsk, target, read,
!(flags & MSG_PEEK), &recv_data);
if (err < 0)
- goto out_wait;
+ goto out;
if (read >= target || flags & MSG_PEEK)
break;
target -= read;
- } else {
- if (sk->sk_err != 0 || (sk->sk_shutdown & RCV_SHUTDOWN)
- || (vsk->peer_shutdown & SEND_SHUTDOWN)) {
- break;
- }
- /* Don't wait for non-blocking sockets. */
- if (timeout == 0) {
- err = -EAGAIN;
- break;
- }
-
- err = transport->notify_recv_pre_block(
- vsk, target, &recv_data);
- if (err < 0)
- break;
-
- release_sock(sk);
- timeout = schedule_timeout(timeout);
- lock_sock(sk);
-
- if (signal_pending(current)) {
- err = sock_intr_errno(timeout);
- break;
- } else if (timeout == 0) {
- err = -EAGAIN;
- break;
- }
-
- prepare_to_wait(sk_sleep(sk), &wait,
- TASK_INTERRUPTIBLE);
}
}
@@ -1816,8 +1830,6 @@ vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
err = copied;
}
-out_wait:
- finish_wait(sk_sleep(sk), &wait);
out:
release_sock(sk);
return err;
--
2.8.0.rc3

164
alpine/kernel/patches/0003-vsock-Fix-blocking-ops-call-in-prepare_to_wait.patch
View File

@ -1,164 +0,0 @@
From e4d5bbced996499e080e790508113985963a55d5 Mon Sep 17 00:00:00 2001
From: Laura Abbott <labbott@fedoraproject.org>
Date: Thu, 4 Feb 2016 10:50:45 -0800
Subject: [PATCH 3/9] vsock: Fix blocking ops call in prepare_to_wait
We receoved a bug report from someone using vmware:
WARNING: CPU: 3 PID: 660 at kernel/sched/core.c:7389
__might_sleep+0x7d/0x90()
do not call blocking ops when !TASK_RUNNING; state=1 set at
[<ffffffff810fa68d>] prepare_to_wait+0x2d/0x90
Modules linked in: vmw_vsock_vmci_transport vsock snd_seq_midi
snd_seq_midi_event snd_ens1371 iosf_mbi gameport snd_rawmidi
snd_ac97_codec ac97_bus snd_seq coretemp snd_seq_device snd_pcm
snd_timer snd soundcore ppdev crct10dif_pclmul crc32_pclmul
ghash_clmulni_intel vmw_vmci vmw_balloon i2c_piix4 shpchp parport_pc
parport acpi_cpufreq nfsd auth_rpcgss nfs_acl lockd grace sunrpc btrfs
xor raid6_pq 8021q garp stp llc mrp crc32c_intel serio_raw mptspi vmwgfx
drm_kms_helper ttm drm scsi_transport_spi mptscsih e1000 ata_generic
mptbase pata_acpi
CPU: 3 PID: 660 Comm: vmtoolsd Not tainted
4.2.0-0.rc1.git3.1.fc23.x86_64 #1
Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop
Reference Platform, BIOS 6.00 05/20/2014
0000000000000000 0000000049e617f3 ffff88006ac37ac8 ffffffff818641f5
0000000000000000 ffff88006ac37b20 ffff88006ac37b08 ffffffff810ab446
ffff880068009f40 ffffffff81c63bc0 0000000000000061 0000000000000000
Call Trace:
[<ffffffff818641f5>] dump_stack+0x4c/0x65
[<ffffffff810ab446>] warn_slowpath_common+0x86/0xc0
[<ffffffff810ab4d5>] warn_slowpath_fmt+0x55/0x70
[<ffffffff8112551d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[<ffffffff810fa68d>] ? prepare_to_wait+0x2d/0x90
[<ffffffff810fa68d>] ? prepare_to_wait+0x2d/0x90
[<ffffffff810da2bd>] __might_sleep+0x7d/0x90
[<ffffffff812163b3>] __might_fault+0x43/0xa0
[<ffffffff81430477>] copy_from_iter+0x87/0x2a0
[<ffffffffa039460a>] __qp_memcpy_to_queue+0x9a/0x1b0 [vmw_vmci]
[<ffffffffa0394740>] ? qp_memcpy_to_queue+0x20/0x20 [vmw_vmci]
[<ffffffffa0394757>] qp_memcpy_to_queue_iov+0x17/0x20 [vmw_vmci]
[<ffffffffa0394d50>] qp_enqueue_locked+0xa0/0x140 [vmw_vmci]
[<ffffffffa039593f>] vmci_qpair_enquev+0x4f/0xd0 [vmw_vmci]
[<ffffffffa04847bb>] vmci_transport_stream_enqueue+0x1b/0x20
[vmw_vsock_vmci_transport]
[<ffffffffa047ae05>] vsock_stream_sendmsg+0x2c5/0x320 [vsock]
[<ffffffff810fabd0>] ? wake_atomic_t_function+0x70/0x70
[<ffffffff81702af8>] sock_sendmsg+0x38/0x50
[<ffffffff81702ff4>] SYSC_sendto+0x104/0x190
[<ffffffff8126e25a>] ? vfs_read+0x8a/0x140
[<ffffffff817042ee>] SyS_sendto+0xe/0x10
[<ffffffff8186d9ae>] entry_SYSCALL_64_fastpath+0x12/0x76
transport->stream_enqueue may call copy_to_user so it should
not be called inside a prepare_to_wait. Narrow the scope of
the prepare_to_wait to avoid the bad call. This also applies
to vsock_stream_recvmsg as well.
Reported-by: Vinson Lee <vlee@freedesktop.org>
Tested-by: Vinson Lee <vlee@freedesktop.org>
Signed-off-by: Laura Abbott <labbott@fedoraproject.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 5988818008257ca42010d6b43a3e0e48afec9898)
---
net/vmw_vsock/af_vsock.c | 19 ++++++-------------
1 file changed, 6 insertions(+), 13 deletions(-)
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 7fd1220..bbe65dc 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -1557,8 +1557,6 @@ static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg,
if (err < 0)
goto out;
- prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
-
while (total_written < len) {
ssize_t written;
@@ -1578,7 +1576,9 @@ static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg,
goto out_wait;
release_sock(sk);
+ prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
timeout = schedule_timeout(timeout);
+ finish_wait(sk_sleep(sk), &wait);
lock_sock(sk);
if (signal_pending(current)) {
err = sock_intr_errno(timeout);
@@ -1588,8 +1588,6 @@ static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg,
goto out_wait;
}
- prepare_to_wait(sk_sleep(sk), &wait,
- TASK_INTERRUPTIBLE);
}
/* These checks occur both as part of and after the loop
@@ -1635,7 +1633,6 @@ static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg,
out_wait:
if (total_written > 0)
err = total_written;
- finish_wait(sk_sleep(sk), &wait);
out:
release_sock(sk);
return err;
@@ -1716,7 +1713,6 @@ vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
if (err < 0)
goto out;
- prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
while (1) {
s64 ready = vsock_stream_has_data(vsk);
@@ -1727,7 +1723,7 @@ vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
*/
err = -ENOMEM;
- goto out_wait;
+ goto out;
} else if (ready > 0) {
ssize_t read;
@@ -1750,7 +1746,7 @@ vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
vsk, target, read,
!(flags & MSG_PEEK), &recv_data);
if (err < 0)
- goto out_wait;
+ goto out;
if (read >= target || flags & MSG_PEEK)
break;
@@ -1773,7 +1769,9 @@ vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
break;
release_sock(sk);
+ prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
timeout = schedule_timeout(timeout);
+ finish_wait(sk_sleep(sk), &wait);
lock_sock(sk);
if (signal_pending(current)) {
@@ -1783,9 +1781,6 @@ vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
err = -EAGAIN;
break;
}
-
- prepare_to_wait(sk_sleep(sk), &wait,
- TASK_INTERRUPTIBLE);
}
}
@@ -1816,8 +1811,6 @@ vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
err = copied;
}
-out_wait:
- finish_wait(sk_sleep(sk), &wait);
out:
release_sock(sk);
return err;
--
2.8.0.rc3

6
alpine/kernel/patches/0004-VSOCK-transport-specific-vsock_transport-functions.patch
View File

@ -1,4 +1,4 @@
From 99f109b560a95f17f7d034a48c8479c37a685c5a Mon Sep 17 00:00:00 2001
From a3f136168f164f66de1de277a08b76f54b289d5a Mon Sep 17 00:00:00 2001
From: Stefan Hajnoczi <stefanha@redhat.com>
Date: Thu, 17 Dec 2015 11:10:21 +0800
Subject: [PATCH 4/9] VSOCK: transport-specific vsock_transport functions
@ -34,10 +34,10 @@ index e9eb2d6..23f5525 100644
void vsock_release_pending(struct sock *pending);
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index bbe65dc..1e5f5ed 100644
index 3dce53e..112fa8b 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -1987,6 +1987,15 @@ void vsock_core_exit(void)
@@ -2006,6 +2006,15 @@ void vsock_core_exit(void)
}
EXPORT_SYMBOL_GPL(vsock_core_exit);

2
alpine/kernel/patches/0005-VSOCK-Introduce-virtio_vsock_common.ko.patch
View File

@ -1,4 +1,4 @@
From ec05812c3fd57234fa8f7d211924b3c254988c89 Mon Sep 17 00:00:00 2001
From 4018aa8a812fd6f1a64e3d227550bf5752127314 Mon Sep 17 00:00:00 2001
From: Asias He <asias@redhat.com>
Date: Thu, 13 Jun 2013 18:27:00 +0800
Subject: [PATCH 5/9] VSOCK: Introduce virtio_vsock_common.ko

2
alpine/kernel/patches/0006-VSOCK-Introduce-virtio_transport.ko.patch
View File

@ -1,4 +1,4 @@
From 9e5562c5785843a8247d172112302fb8d1cdfcec Mon Sep 17 00:00:00 2001
From ccaac837ceb4a9582bb57f71e0cac791f7336b19 Mon Sep 17 00:00:00 2001
From: Asias He <asias@redhat.com>
Date: Thu, 13 Jun 2013 18:28:48 +0800
Subject: [PATCH 6/9] VSOCK: Introduce virtio_transport.ko

2
alpine/kernel/patches/0007-VSOCK-Introduce-vhost_vsock.ko.patch
View File

@ -1,4 +1,4 @@
From 2da9f4eef909efa13574326bf29efab439bcc77c Mon Sep 17 00:00:00 2001
From f52efbc874c742a671939ea6408c59545025007d Mon Sep 17 00:00:00 2001
From: Asias He <asias@redhat.com>
Date: Thu, 13 Jun 2013 18:29:21 +0800
Subject: [PATCH 7/9] VSOCK: Introduce vhost_vsock.ko

2
alpine/kernel/patches/0008-VSOCK-Add-Makefile-and-Kconfig.patch
View File

@ -1,4 +1,4 @@
From 4293a00ac211e20980a0739498a73aae4d8546bf Mon Sep 17 00:00:00 2001
From e8c8f5299fd202db5d56a10f1dc0a4e464e9a211 Mon Sep 17 00:00:00 2001
From: Asias He <asias@redhat.com>
Date: Thu, 13 Jun 2013 18:30:19 +0800
Subject: [PATCH 8/9] VSOCK: Add Makefile and Kconfig

6
alpine/kernel/patches/0009-VSOCK-Only-allow-host-network-namespace-to-use-AF_VS.patch
View File

@ -1,4 +1,4 @@
From 366c9c42afb9bd54f92f72518470c09e46f12e88 Mon Sep 17 00:00:00 2001
From 550ec4c8f90f2bf99c1bcb13b2f8476780f42418 Mon Sep 17 00:00:00 2001
From: Ian Campbell <ian.campbell@docker.com>
Date: Mon, 4 Apr 2016 14:50:10 +0100
Subject: [PATCH 9/9] VSOCK: Only allow host network namespace to use AF_VSOCK.
@ -12,10 +12,10 @@ Signed-off-by: Ian Campbell <ian.campbell@docker.com>
1 file changed, 3 insertions(+)
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 1e5f5ed..cdb3dd3 100644
index 112fa8b..ead5127 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -1840,6 +1840,9 @@ static const struct proto_ops vsock_stream_ops = {
@@ -1859,6 +1859,9 @@ static const struct proto_ops vsock_stream_ops = {
static int vsock_create(struct net *net, struct socket *sock,
int protocol, int kern)
{