netdev - Re: [patch net] devlink: convert occ_get op to separate registration

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Date:   Thu, 5 Apr 2018 14:55:58 -0600
From:   David Ahern <dsahern@...il.com>
To:     Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, idosch@...lanox.com,
        jakub.kicinski@...ronome.com, mlxsw@...lanox.com
Subject: Re: [patch net] devlink: convert occ_get op to separate registration

On 4/5/18 2:13 PM, Jiri Pirko wrote:
> From: Jiri Pirko <jiri@...lanox.com>
> 
> This resolves race during initialization where the resources with
> ops are registered before driver and the structures used by occ_get
> op is initialized. So keep occ_get callbacks registered only when
> all structs are initialized.
> 
> The example flows, as it is in mlxsw:
> 1) driver load/asic probe:
>    mlxsw_core
>       -> mlxsw_sp_resources_register
>         -> mlxsw_sp_kvdl_resources_register
>           -> devlink_resource_register IDX
>    mlxsw_spectrum
>       -> mlxsw_sp_kvdl_init
>         -> mlxsw_sp_kvdl_parts_init
>           -> mlxsw_sp_kvdl_part_init
>             -> devlink_resource_size_get IDX (to get the current setup
>                                               size from devlink)
>         -> devlink_resource_occ_get_register IDX (register current
>                                                   occupancy getter)
> 2) reload triggered by devlink command:
>   -> mlxsw_devlink_core_bus_device_reload
>     -> mlxsw_sp_fini
>       -> mlxsw_sp_kvdl_fini
> 	-> devlink_resource_occ_get_unregister IDX
>     (struct mlxsw_sp *mlxsw_sp is freed at this point, call to occ get
>      which is using mlxsw_sp would cause use-after free)
>     -> mlxsw_sp_init
>       -> mlxsw_sp_kvdl_init
>         -> mlxsw_sp_kvdl_parts_init
>           -> mlxsw_sp_kvdl_part_init
>             -> devlink_resource_size_get IDX (to get the current setup
>                                               size from devlink)
>         -> devlink_resource_occ_get_register IDX (register current
>                                                   occupancy getter)
> 
> Fixes: d9f9b9a4d05f ("devlink: Add support for resource abstraction")
> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
> ---


Why won't something like the attached work as opposed to playing
register / unregister games?

View attachment "mlxsw-reload.patch" of type "text/plain" (4748 bytes)