linux-kernel - [PATCH 4.16 54/81] VSOCK: make af

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Date:   Fri, 27 Apr 2018 15:58:56 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Xiumei Mu <xmu@...hat.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jorgen Hansen <jhansen@...are.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.16 54/81] VSOCK: make af_vsock.ko removable again

4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stefan Hajnoczi <stefanha@...hat.com>

[ Upstream commit 05e489b1596f0aa1025a1fa572676631cd9665da ]

Commit c1eef220c1760762753b602c382127bfccee226d ("vsock: always call
vsock_init_tables()") introduced a module_init() function without a
corresponding module_exit() function.

Modules with an init function can only be removed if they also have an
exit function.  Therefore the vsock module was considered "permanent"
and could not be removed.

This patch adds an empty module_exit() function so that "rmmod vsock"
works.  No explicit cleanup is required because:

1. Transports call vsock_core_exit() upon exit and cannot be removed
   while sockets are still alive.
2. vsock_diag.ko does not perform any action that requires cleanup by
   vsock.ko.

Fixes: c1eef220c176 ("vsock: always call vsock_init_tables()")
Reported-by: Xiumei Mu <xmu@...hat.com>
Cc: Cong Wang <xiyou.wangcong@...il.com>
Cc: Jorgen Hansen <jhansen@...are.com>
Signed-off-by: Stefan Hajnoczi <stefanha@...hat.com>
Reviewed-by: Jorgen Hansen <jhansen@...are.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/vmw_vsock/af_vsock.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -2018,7 +2018,13 @@ const struct vsock_transport *vsock_core
 }
 EXPORT_SYMBOL_GPL(vsock_core_get_transport);

+static void __exit vsock_exit(void)
+{
+	/* Do nothing.  This function makes this module removable. */
+}
+
 module_init(vsock_init_tables);
+module_exit(vsock_exit);

 MODULE_AUTHOR("VMware, Inc.");
 MODULE_DESCRIPTION("VMware Virtual Socket Family");