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>

1 files changed, 1 insertions, 3 deletions

diff --git a/drivers/net/usb/smsc75xx.c b/drivers/net/usb/smsc75xx.c
index ecab87b85728..72b62b51c46f 100644
--- 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);