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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Dmitry Monakhov <dmonakhov@openvz.org>,
        Leon Romanovsky <leonro@mellanox.com>,
        Jason Gunthorpe <jgg@mellanox.com>,
        Sasha Levin <alexander.levin@verizon.com>
Subject: [PATCH 4.14 093/159] IB/core: Init subsys if compiled to vmlinuz-core
Date:   Fri, 23 Feb 2018 19:26:41 +0100
Message-Id: <20180223170754.770331866@linuxfoundation.org>
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4.14-stable review patch.  If anyone has any objections, please let me know.

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

From: Dmitry Monakhov <dmonakhov@openvz.org>


[ Upstream commit a9cd1a673737dd81332fce1145801bfacfb90d90 ]

Once infiniband is compiled as a core component its subsystem must be
enabled before device initialization. Otherwise there is a NULL pointer
dereference during mlx4_core init, calltrace:
->device_add
  if (dev->class) {
     deref  dev->class->p =>NULLPTR

#Config
CONFIG_NET_DEVLINK=y
CONFIG_MAY_USE_DEVLINK=y
CONFIG_MLX4_EN=y

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/infiniband/core/device.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -1261,5 +1261,5 @@ static void __exit ib_core_cleanup(void)
 
 MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_LS, 4);
 
-module_init(ib_core_init);
+subsys_initcall(ib_core_init);
 module_exit(ib_core_cleanup);