linux-kernel - Re: [PATCH net] devlink: Remove extra assertion from flash notification logic

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Date:   Wed, 17 Nov 2021 16:38:58 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Amit Cohen <amcohen@...dia.com>, Jiri Pirko <jiri@...dia.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net] devlink: Remove extra assertion from flash
 notification logic

On Wed, Nov 17, 2021 at 06:02:28AM -0800, Jakub Kicinski wrote:
> On Wed, 17 Nov 2021 15:23:18 +0200 Leon Romanovsky wrote:
> > > I'd drop these notifications, the user didn't ask to flash the device,
> > > it's just code reuse in the driver, right?  
> > 
> > Sorry, I missed your reply.
> > 
> > I'm not sure about code reuse, from the code, it looks like attempt to
> > burn FW during mlxsw register.
> > 
> > __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(...)  
> > 
> > The mlxfw_firmware_flash() routine is called by mlx5 too, so I can't
> > remove mlxfw_status_notify() calls without too much changes.
> > 
> > Easiest solution was to remove WARN_ON(), because no one really
> > interested in these events anyway. I searched in github and didn't
> > find any user who listened to them.
> 
> Drop in the core. Like this?

Of course, sorry for overlooking of such simple solution.
I'm sending new version right now.

Thanks

> 
> 
>  	WARN_ON(cmd != DEVLINK_CMD_FLASH_UPDATE &&
>  		cmd != DEVLINK_CMD_FLASH_UPDATE_END &&
>  		cmd != DEVLINK_CMD_FLASH_UPDATE_STATUS);
> -	WARN_ON(!xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED));
> +
> +	if (!xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED))
> +		return;
>  
>  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
>  	if (!msg)