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net: phy: micrel: fix config_intr error handling 

Make sure never to update the control register with random data (an
error code) by checking the return value after reading it.

Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johan Hovold 2014-11-11 20:00:08 +01:00 committed by David S. Miller
parent c88c7d3204
commit 5bb8fc0d10
1 changed files with 6 additions and 0 deletions
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6
drivers/net/phy/micrel.c
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@ -122,6 +122,8 @@ static int kszphy_config_intr(struct phy_device *phydev)
/* set the interrupt pin active low */
temp = phy_read(phydev, MII_KSZPHY_CTRL);
if (temp < 0)
return temp;
temp &= ~KSZPHY_CTRL_INT_ACTIVE_HIGH;
phy_write(phydev, MII_KSZPHY_CTRL, temp);
rc = kszphy_set_interrupt(phydev);
@ -134,6 +136,8 @@ static int ksz9021_config_intr(struct phy_device *phydev)
/* set the interrupt pin active low */
temp = phy_read(phydev, MII_KSZPHY_CTRL);
if (temp < 0)
return temp;
temp &= ~KSZ9021_CTRL_INT_ACTIVE_HIGH;
phy_write(phydev, MII_KSZPHY_CTRL, temp);
rc = kszphy_set_interrupt(phydev);
@ -146,6 +150,8 @@ static int ks8737_config_intr(struct phy_device *phydev)
/* set the interrupt pin active low */
temp = phy_read(phydev, MII_KSZPHY_CTRL);
if (temp < 0)
return temp;
temp &= ~KS8737_CTRL_INT_ACTIVE_HIGH;
phy_write(phydev, MII_KSZPHY_CTRL, temp);
rc = kszphy_set_interrupt(phydev);