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authorAlexander Duyck <alexander.h.duyck@intel.com>2009-10-05 06:35:42 +0000
committerDavid S. Miller <davem@davemloft.net>2009-10-06 14:59:24 -0700
commit2553bb2681645bf932db2845121b8f33954f6f39 (patch)
tree3aa34b3b94bb1fab528870a7dc72caa182e3587f
parentab576389b733b458495529f81839f499b3fece78 (diff)
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igb: add additional error handling to the phy code
This update adds additional exception handling to the phy code to handle situations where it may be called incorrectly. In addition it adds some bounds checking to the cable length checks to prevent an array overrun in the event that the hardware returned a different value than expected. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/igb/e1000_phy.c39
1 files changed, 25 insertions, 14 deletions
diff --git a/drivers/net/igb/e1000_phy.c b/drivers/net/igb/e1000_phy.c
index 5fe03e114b83..83b706c460b3 100644
--- a/drivers/net/igb/e1000_phy.c
+++ b/drivers/net/igb/e1000_phy.c
@@ -39,6 +39,9 @@ static s32 igb_wait_autoneg(struct e1000_hw *hw);
/* Cable length tables */
static const u16 e1000_m88_cable_length_table[] =
{ 0, 50, 80, 110, 140, 140, E1000_CABLE_LENGTH_UNDEFINED };
+#define M88E1000_CABLE_LENGTH_TABLE_SIZE \
+ (sizeof(e1000_m88_cable_length_table) / \
+ sizeof(e1000_m88_cable_length_table[0]))
static const u16 e1000_igp_2_cable_length_table[] =
{ 0, 0, 0, 0, 0, 0, 0, 0, 3, 5, 8, 11, 13, 16, 18, 21,
@@ -109,7 +112,10 @@ out:
**/
static s32 igb_phy_reset_dsp(struct e1000_hw *hw)
{
- s32 ret_val;
+ s32 ret_val = 0;
+
+ if (!(hw->phy.ops.write_reg))
+ goto out;
ret_val = hw->phy.ops.write_reg(hw, M88E1000_PHY_GEN_CONTROL, 0xC1);
if (ret_val)
@@ -1059,22 +1065,19 @@ s32 igb_phy_force_speed_duplex_m88(struct e1000_hw *hw)
igb_phy_force_speed_duplex_setup(hw, &phy_data);
- /* Reset the phy to commit changes. */
- phy_data |= MII_CR_RESET;
-
ret_val = phy->ops.write_reg(hw, PHY_CONTROL, phy_data);
if (ret_val)
goto out;
- udelay(1);
+ /* Reset the phy to commit changes. */
+ ret_val = igb_phy_sw_reset(hw);
+ if (ret_val)
+ goto out;
if (phy->autoneg_wait_to_complete) {
hw_dbg("Waiting for forced speed/duplex link on M88 phy.\n");
- ret_val = igb_phy_has_link(hw,
- PHY_FORCE_LIMIT,
- 100000,
- &link);
+ ret_val = igb_phy_has_link(hw, PHY_FORCE_LIMIT, 100000, &link);
if (ret_val)
goto out;
@@ -1084,8 +1087,8 @@ s32 igb_phy_force_speed_duplex_m88(struct e1000_hw *hw)
* Reset the DSP and cross our fingers.
*/
ret_val = phy->ops.write_reg(hw,
- M88E1000_PHY_PAGE_SELECT,
- 0x001d);
+ M88E1000_PHY_PAGE_SELECT,
+ 0x001d);
if (ret_val)
goto out;
ret_val = igb_phy_reset_dsp(hw);
@@ -1095,7 +1098,7 @@ s32 igb_phy_force_speed_duplex_m88(struct e1000_hw *hw)
/* Try once more */
ret_val = igb_phy_has_link(hw, PHY_FORCE_LIMIT,
- 100000, &link);
+ 100000, &link);
if (ret_val)
goto out;
}
@@ -1207,9 +1210,12 @@ static void igb_phy_force_speed_duplex_setup(struct e1000_hw *hw,
s32 igb_set_d3_lplu_state(struct e1000_hw *hw, bool active)
{
struct e1000_phy_info *phy = &hw->phy;
- s32 ret_val;
+ s32 ret_val = 0;
u16 data;
+ if (!(hw->phy.ops.read_reg))
+ goto out;
+
ret_val = phy->ops.read_reg(hw, IGP02E1000_PHY_POWER_MGMT, &data);
if (ret_val)
goto out;
@@ -1495,8 +1501,13 @@ s32 igb_get_cable_length_m88(struct e1000_hw *hw)
index = (phy_data & M88E1000_PSSR_CABLE_LENGTH) >>
M88E1000_PSSR_CABLE_LENGTH_SHIFT;
+ if (index >= M88E1000_CABLE_LENGTH_TABLE_SIZE - 1) {
+ ret_val = -E1000_ERR_PHY;
+ goto out;
+ }
+
phy->min_cable_length = e1000_m88_cable_length_table[index];
- phy->max_cable_length = e1000_m88_cable_length_table[index+1];
+ phy->max_cable_length = e1000_m88_cable_length_table[index + 1];
phy->cable_length = (phy->min_cable_length + phy->max_cable_length) / 2;