linux-kernel - Re: [PATCH net] lan966x: Fix unloading/loading of the driver

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Message-ID: <ZGtyJ504Jv5YYcx1@corigine.com>
Date:   Mon, 22 May 2023 15:46:15 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Horatiu Vultur <horatiu.vultur@...rochip.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH net] lan966x: Fix unloading/loading of the driver

On Mon, May 22, 2023 at 02:00:38PM +0200, Horatiu Vultur wrote:
> It was noticing that after a while when unloading/loading the driver and
> sending traffic through the switch, it would stop working. It would stop
> forwarding any traffic and the only way to get out of this was to do a
> power cycle of the board. The root cause seems to be that the switch
> core is initialized twice. Apparently initializing twice the switch core
> disturbs the pointers in the queue systems in the HW, so after a while
> it would stop sending the traffic.

Ouch.

> Unfortunetly, it is not possible to use a reset of the switch here,

nit: s/Unfortunetly/Unfortunately/

> because the reset line is connected to multiple devices like MDIO,
> SGPIO, FAN, etc. So then all the devices will get reseted when the

nit: s/reseted/reset/

> network driver will be loaded.
> So the fix is to check if the core is initialized already and if that is
> the case don't initialize it again.
> 
> Fixes: db8bcaad5393 ("net: lan966x: add the basic lan966x driver")
> Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>

Reviewed-by: Simon Horman <simon.horman@...igine.com>

...