smsc75xx: eliminate unnecessary phy register read

Only a write is necessary to clear the interrupt status, and we
don't use the value from the preceding read operation.  This
patch eliminates the unnecessary read.

Signed-off-by: Steve Glendinning <steve.glendinning@shawell.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/usb/smsc75xx.c b/drivers/net/usb/smsc75xx.c
index ecab87b857289840ee8e99d3a7fff783d7716088..72b62b51c46f83107d159f1bde629032e8da4688 100644 (file)
--- a/drivers/net/usb/smsc75xx.c
+++ b/drivers/net/usb/smsc75xx.c
@@ -508,9 +508,7 @@ static int smsc75xx_link_reset(struct usbnet *dev)
        u16 lcladv, rmtadv;
        int ret;
 
-       /* read and write to clear phy interrupt status */
-       ret = smsc75xx_mdio_read(dev->net, mii->phy_id, PHY_INT_SRC);
-       check_warn_return(ret, "Error reading PHY_INT_SRC");
+       /* write to clear phy interrupt status */
        smsc75xx_mdio_write(dev->net, mii->phy_id, PHY_INT_SRC,
                PHY_INT_SRC_CLEAR_ALL);