[PATCH v4 04/11] net: mvmdio: remove duplicate locking

[Antoine Tenart]

From: Russell King <rmk+ker...@armlinux.org.uk>

The MDIO layer already provides per-bus locking, so there's no need for
MDIO bus drivers to do their own internal locking.  Remove this.

Signed-off-by: Russell King <rmk+ker...@armlinux.org.uk>
---
 drivers/net/ethernet/marvell/mvmdio.c | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvmdio.c 
b/drivers/net/ethernet/marvell/mvmdio.c
index 583f1c5753c2..eab625752b12 100644
--- a/drivers/net/ethernet/marvell/mvmdio.c
+++ b/drivers/net/ethernet/marvell/mvmdio.c
@@ -23,7 +23,6 @@
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
-#include <linux/mutex.h>
 #include <linux/of_mdio.h>
 #include <linux/phy.h>
 #include <linux/platform_device.h>
@@ -51,7 +50,6 @@
 #define MVMDIO_SMI_POLL_INTERVAL_MAX   55
 
 struct orion_mdio_dev {
-       struct mutex lock;
        void __iomem *regs;
        struct clk *clk[3];
        /*
@@ -116,8 +114,6 @@ static int orion_mdio_read(struct mii_bus *bus, int mii_id,
        u32 val;
        int ret;
 
-       mutex_lock(&dev->lock);
-
        ret = orion_mdio_wait_ready(bus);
        if (ret < 0)
                goto out;
@@ -140,7 +136,6 @@ static int orion_mdio_read(struct mii_bus *bus, int mii_id,
 
        ret = val & GENMASK(15, 0);
 out:
-       mutex_unlock(&dev->lock);
        return ret;
 }
 
@@ -150,8 +145,6 @@ static int orion_mdio_write(struct mii_bus *bus, int mii_id,
        struct orion_mdio_dev *dev = bus->priv;
        int ret;
 
-       mutex_lock(&dev->lock);
-
        ret = orion_mdio_wait_ready(bus);
        if (ret < 0)
                goto out;
@@ -163,7 +156,6 @@ static int orion_mdio_write(struct mii_bus *bus, int mii_id,
               dev->regs);
 
 out:
-       mutex_unlock(&dev->lock);
        return ret;
 }
 
@@ -244,8 +236,6 @@ static int orion_mdio_probe(struct platform_device *pdev)
                return -EPROBE_DEFER;
        }
 
-       mutex_init(&dev->lock);
-
        if (pdev->dev.of_node)
                ret = of_mdiobus_register(bus, pdev->dev.of_node);
        else
-- 
2.9.4