[PATCH V4 2/4] net-next: mediatek: add support for MT7623 ethernet
From: davem@davemloft.net (David Miller)
Date: 2016-03-07 16:31:01
Also in:
linux-mediatek, lkml, netdev
From: John Crispin <redacted> 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.