Subject: Re: [RFC PATCH net-next v4 10/28] net: dsa: qca8k: handle error with qca8k_rmw operation

From: Andrew Lunn <[email-masked]>
Date: Sat, 8 May 2021 19:59:11 +0200

> -static void
> +static int
>  qca8k_reg_set(struct qca8k_priv *priv, u32 reg, u32 val)
>  {
> -	qca8k_rmw(priv, reg, 0, val);
> +	int ret;
> +
> +	ret = qca8k_rmw(priv, reg, 0, val);
> +	if (ret < 0)
> +		return ret;
> +
> +	return 0;

This is wrong. Look at qca8k_rmw():

static u32
qca8k_rmw(struct qca8k_priv *priv, u32 reg, u32 mask, u32 val)
{
	u16 r1, r2, page;
	u32 ret;

	qca8k_split_addr(reg, &r1, &r2, &page);

	mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED);

	qca8k_set_page(priv->bus, page);
	ret = qca8k_mii_read32(priv->bus, 0x10 | r2, r1);
	ret &= ~mask;
	ret |= val;
	qca8k_mii_write32(priv->bus, 0x10 | r2, r1, ret);

	mutex_unlock(&priv->bus->mdio_lock);

	return ret;
}

First off, it returns a u32. So you cannot actually represent negative
error numbers.

Also, since it is returning what is now contained in the register,
that value might actually look like an error code.

I had a quick look at all the places qca8k_rmw() is called. As far as
i could see, the return value is never used. I suggest you double
check that, and then change this function. Make it return a negative
error code, or 0 on success. You can then simplify the code using the
return value.

       Andrew