tree e14a648620d72717246b3d271722ce9e26e99daa
parent 2d7c93bfe6c45505a102078f9a1e65517bb7bbfb
author Gao feng <gaofeng@cn.fujitsu.com> 1349381748 +0000
committer chrmhoffmann <chrmhoffmann@gmail.com> 1502527541 +0200

netlink: add reference of module in netlink_dump_start

[ Upstream commit 6dc878a8ca39e93f70c42f3dd7260bde10c1e0f1 ]

I get a panic when I use ss -a and rmmod inet_diag at the
same time.

It's because netlink_dump uses inet_diag_dump which belongs to module
inet_diag.

I search the codes and find many modules have the same problem.  We
need to add a reference to the module which the cb->dump belongs to.

Thanks for all help from Stephen,Jan,Eric,Steffen and Pablo.

Change From v3:
change netlink_dump_start to inline,suggestion from Pablo and
Eric.

Change From v2:
delete netlink_dump_done,and call module_put in netlink_dump
and netlink_sock_destruct.

Change-Id: I94165f00e6e1a43adf43c1dfb0609dde066d774a
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>