netdev - [PATCH 2/3] smsc75xx: eliminate unnecessary phy register read

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Date:	Fri,  4 May 2012 11:57:12 +0100
From:	Steve Glendinning <steve.glendinning@...well.net>
To:	netdev@...r.kernel.org
Cc:	"David S. Miller" <davem@...emloft.net>,
	Steve Glendinning <steve.glendinning@...well.net>
Subject: [PATCH 2/3] 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@...well.net>
---
 drivers/net/usb/smsc75xx.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/net/usb/smsc75xx.c b/drivers/net/usb/smsc75xx.c
index ecab87b..72b62b5 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);
 
-- 
1.7.9.5

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