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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>
This commit is contained in:
Steve Glendinning 2012-05-04 00:57:12 +00:00 committed by David S. Miller
parent 7749622d7f
commit 4f94a929e4
1 changed files with 1 additions and 3 deletions
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4
drivers/net/usb/smsc75xx.c
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@ -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);