[PATCH 1/2] net: phylink: add sync flag mac_ready to fix resume issue with WoL enabled

[Russell King (Oracle)]

On Wed, Nov 30, 2022 at 07:11:47PM +0800, Clark Wang wrote:
> Issue we met:
> On some platforms, mac cannot work after resumed from the suspend with WoL
> enabled.
> 
> The cause of the issue:
> 1. phylink_resolve() is in a workqueue which will not be executed immediately.
>    This is the call sequence:
>        phylink_resolve()->phylink_link_up()->pl->mac_ops->mac_link_up()
>    For stmmac driver, mac_link_up() will set the correct speed/duplex...
>    values which are from link_state.
> 2. In stmmac_resume(), it will call stmmac_hw_setup() after called the
>    phylink_resume(). stmmac_core_init() is called in function stmmac_hw_setup(),

... and that is where the problem is. Don't call phylink_resume() before
your hardware is ready to see a link-up event.

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