[PATCH net-next 2/3] net: stmmac: remove useless priv->flow_ctrl

[Andrew Lunn]

On Tue, Feb 18, 2025 at 10:24:34AM +0000, Russell King (Oracle) wrote:
> priv->flow_ctrl is only accessed by stmmac_main.c, and the only place
> that it is read is in stmmac_mac_flow_ctrl(). This function is only
> called from stmmac_mac_link_up() which always sets priv->flow_ctrl
> immediately before calling this function.
> 
> Therefore, initialising this at probe time is ineffectual because it
> will always be overwritten before it's read. As such, the "flow_ctrl"
> module parameter has been useless for some time. Rather than remove
> the module parameter, which would risk module load failure, change the
> description to indicate that it is obsolete, and warn if it is set by
> userspace.
> 
> Moreover, storing the value in the stmmac_priv has no benefit as it's
> set and then immediately read stmmac_mac_flow_ctrl(). Instead, pass it
> as a parameter to this function..
> 
> Signed-off-by: Russell King (Oracle) <rmk+kernel at armlinux.org.uk>

Reviewed-by: Andrew Lunn <andrew at lunn.ch>

    Andrew