From: John Crispin <blo...@openwrt.org>
Date: Mon, 7 Mar 2016 09:56:35 +0100
> +static int mtk_mdio_busy_wait(struct mtk_eth *eth)
> +{
> + unsigned long t_start = jiffies;
> +
> + while (1) {
> + if (!(mtk_r32(eth, MTK_PHY_IAC) & PHY_IAC_ACCESS))
> + return 0;
> + if (time_after(jiffies, t_start + PHY_IAC_TIMEOUT))
> + break;
> + }
> +
> + dev_err(eth->dev, "mdio: MDIO timeout\n");
> + return -1;
> +}
Busy polling in a loop for up to 5 seconds with no preemption points
is not something you can do, sorry.
