2/2] net: xilinx_emaclite: use readx_poll_timeout() in mdio wait function

On loaded systems with a preemptible kernel the mdio_wait() function may
report an error while everything is working fine:

xemaclite_mdio_wait():
  xemaclite_readl() -> chip not ready
  --> interrupt here (other work for some time / chip become ready)
  if (time_before_eq(end, jiffies))
    --> false positive error report

Replace the current code with readx_poll_timeout() which takes care
of the situation.
Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/xilinx/xilinx_emaclite.c

@@ -27,6 +27,7 @@
 #include <linux/of_net.h>
 #include <linux/phy.h>
 #include <linux/interrupt.h>
+#include <linux/iopoll.h>
 
 #define DRIVER_NAME "xilinx_emaclite"
 
@@ -714,20 +715,15 @@ static irqreturn_t xemaclite_interrupt(int irq, void *dev_id)
 
 static int xemaclite_mdio_wait(struct net_local *lp)
 {
-	unsigned long end = jiffies + 2;
+	u32 val;
 
 	/* wait for the MDIO interface to not be busy or timeout
 	 * after some time.
 	 */
-	while (xemaclite_readl(lp->base_addr + XEL_MDIOCTRL_OFFSET) &
-			XEL_MDIOCTRL_MDIOSTS_MASK) {
-		if (time_before_eq(end, jiffies)) {
-			WARN_ON(1);
-			return -ETIMEDOUT;
-		}
-		msleep(1);
-	}
-	return 0;
+	return readx_poll_timeout(xemaclite_readl,
+				  lp->base_addr + XEL_MDIOCTRL_OFFSET,
+				  val, !(val & XEL_MDIOCTRL_MDIOSTS_MASK),
+				  1000, 20000);
 }
 
 /**