Re: [PATCH V4 2/4] net-next: mediatek: add support for MT7623 ethernet
flat view
From: David Miller <davem@davemloft.net>
Date: 2016-03-07 16:31:01
Also in:
linux-arm-kernel, linux-mediatek, lkml
From: John Crispin <redacted> Date: Mon, 7 Mar 2016 09:56:35 +0100
quoted hunk ↗ jump to hunk
+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.