diff mbox series

[[PATCH,net-next] 2/2] net: xilinx_emaclite: use readx_poll_timeout() in mdio wait function

Message ID 20190519175937.3955-3-b.spranger@linutronix.de
State Accepted
Delegated to: David Miller
Headers show
Series [[PATCH,net-next] 2/2] net: xilinx_emaclite: use readx_poll_timeout() in mdio wait function | expand

Commit Message

Benedikt Spranger May 19, 2019, 5:59 p.m. UTC 
From: Kurt Kanzenbach <kurt@linutronix.de>

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>
---
 drivers/net/ethernet/xilinx/xilinx_emaclite.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/xilinx/xilinx_emaclite.c b/drivers/net/ethernet/xilinx/xilinx_emaclite.c
index 6886270da695..c409bab63bd3 100644
--- a/drivers/net/ethernet/xilinx/xilinx_emaclite.c
+++ b/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);
 }
 
 /**