linux-kernel - Re: [PATCH net v1] devlink: Don't throw an error if flash notification sent before devlink visible

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Message-ID: <20211117202935.10fcf82d@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Wed, 17 Nov 2021 20:29:35 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Leon Romanovsky <leonro@...dia.com>,
        Danielle Ratson <danieller@...dia.com>,
        Jiri Pirko <jiri@...dia.com>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, Amit Cohen <amcohen@...dia.com>
Subject: Re: [PATCH net v1] devlink: Don't throw an error if flash
 notification sent before devlink visible

On Wed, 17 Nov 2021 16:49:09 +0200 Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@...dia.com>
> 
> The mlxsw driver calls to various devlink flash routines even before
> users can get any access to the devlink instance itself. For example,
> mlxsw_core_fw_rev_validate() one of such functions.
> 
> __mlxsw_core_bus_device_register
>  -> mlxsw_core_fw_rev_validate
>   -> mlxsw_core_fw_flash
>    -> mlxfw_firmware_flash
>     -> mlxfw_status_notify
>      -> devlink_flash_update_status_notify
>       -> __devlink_flash_update_notify
>        -> WARN_ON(...)  
> 
> It causes to the WARN_ON to trigger warning about devlink not registered.
> 
> Fixes: cf530217408e ("devlink: Notify users when objects are accessible")
> Reported-by: Danielle Ratson <danieller@...dia.com>
> Tested-by: Danielle Ratson <danieller@...dia.com>
> Signed-off-by: Leon Romanovsky <leonro@...dia.com>

Acked-by: Jakub Kicinski <kuba@...nel.org>