Re: [PATCH] net: cpsw: don't reset twice

[Sascha Hauer <s.hauer@pengutronix.de>]

On Fri, Nov 15, 2019 at 05:19:28PM +0100, Michael Grzeschik wrote:
> The softreset was already called previously in open and other settings
> have been prepared afterwards, so don't reset it a second time.
> 
> Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
> ---
>  drivers/net/cpsw.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/net/cpsw.c b/drivers/net/cpsw.c
> index b9a6575009..4eb2205daa 100644
> --- a/drivers/net/cpsw.c
> +++ b/drivers/net/cpsw.c
> @@ -676,8 +676,6 @@ static void cpsw_slave_init(struct cpsw_slave *slave, struct cpsw_priv *priv)
>  
>  	dev_dbg(&slave->dev, "* %s\n", __func__);
>  
> -	soft_reset(priv, &slave->sliver->soft_reset);
> -

What you remove here is the only place where soft_reset() is called with
&slave->sliver->soft_reset. If you have to remove that to fix something
then it's not because we reset something twice.

What looks really really fishy in this driver is that cpsw_open() is
called per slave, but nearly all things this function does affect the
whole cpsw and not the slave instance it is called with. This starts
with:

	soft_reset(priv, &priv->regs->soft_reset);

It looks like this can't work when multiple slaves are enabled.

Sascha


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