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igb: do not allow phy sw reset code to make calls to null pointers

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In the case of fiber and serdes adapters we were seeing issues with ethtool
-t causing kernel panics due to null function pointers.  To prevent this we
need to exit out of the phy reset code in the event that we do not have a
valid phy.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck 2009-09-14 08:23:13 +00:00 committed by David S. Miller
parent 2fb02a26bd
commit d314737ad3
1 changed files with 4 additions and 1 deletions
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5
drivers/net/igb/e1000_phy.c
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@ -1565,9 +1565,12 @@ s32 igb_get_phy_info_igp(struct e1000_hw *hw)
**/
s32 igb_phy_sw_reset(struct e1000_hw *hw)
{
s32 ret_val;
s32 ret_val = 0;
u16 phy_ctrl;
if (!(hw->phy.ops.read_reg))
goto out;
ret_val = hw->phy.ops.read_reg(hw, PHY_CONTROL, &phy_ctrl);
if (ret_val)
goto out;