netdev - Re: [PATCH v4 2/2] ethernet: eswin: Add eic7700 ethernet driver

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Message-ID: <7a39a658-0a83-4998-ae43-344025996c7b@lunn.ch>
Date: Wed, 27 Aug 2025 14:37:14 +0200
From: Andrew Lunn <andrew@...n.ch>
To: weishangjuan@...incomputing.com
Cc: devicetree@...r.kernel.org, andrew+netdev@...n.ch, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
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Subject: Re: [PATCH v4 2/2] ethernet: eswin: Add eic7700 ethernet driver

> +/**
> + * eic7700_apply_delay - Update TX or RX delay bits in delay parameter value.
> + * @delay_ps: Delay in picoseconds (capped at 12.7ns).
> + * @reg:      Pointer to register value to modify.
> + * @is_rx:    True for RX delay (bits 30:24), false for TX delay (bits 14:8).
> + *
> + * Converts delay to 0.1ns units, caps at 0x7F, and sets appropriate bits.
> + * Only RX or TX bits are updated; other bits remain unchanged.
> + */
> +static inline void eic7700_apply_delay(u32 delay_ps, u32 *reg, bool is_rx)
> +{
> +	if (!reg)
> +		return;
> +

Please don't use inline functions in .c files. Leave the compile to
decide.


> +	/* Read rx-internal-delay-ps and update rx_clk delay */
> +	if (!of_property_read_u32(pdev->dev.of_node,
> +				  "rx-internal-delay-ps",
> +				  &dwc_priv->rx_delay_ps)) {
> +		eic7700_apply_delay(dwc_priv->rx_delay_ps,
> +				    &eth_dly_param, true);
> +	} else {
> +		dev_warn(&pdev->dev, "can't get rx-internal-delay-ps\n");
> +	}
> +
> +	/* Read tx-internal-delay-ps and update tx_clk delay */
> +	if (!of_property_read_u32(pdev->dev.of_node,
> +				  "tx-internal-delay-ps",
> +				  &dwc_priv->tx_delay_ps)) {
> +		eic7700_apply_delay(dwc_priv->tx_delay_ps,
> +				    &eth_dly_param, false);

Given this code, why does eic7700_apply_delay() test for reg?  Don't
use defensive code, read your own code and make sure it cannot happen.

    Andrew

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