This is a note to let you know that I've just added the patch titled IB/core: Init subsys if compiled to vmlinuz-core to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ib-core-init-subsys-if-compiled-to-vmlinuz-core.patch and it can be found in the queue-4.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Fri Feb 23 11:45:09 CET 2018 From: Dmitry Monakhov <dmonakhov@xxxxxxxxxx> Date: Mon, 27 Nov 2017 13:39:05 +0000 Subject: IB/core: Init subsys if compiled to vmlinuz-core From: Dmitry Monakhov <dmonakhov@xxxxxxxxxx> [ 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@xxxxxxxxxx> Reviewed-by: Leon Romanovsky <leonro@xxxxxxxxxxxx> Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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); Patches currently in stable-queue which might be from dmonakhov@xxxxxxxxxx are queue-4.14/ib-core-init-subsys-if-compiled-to-vmlinuz-core.patch