From bb034512da74dce901f738f7c7cea332ff971608 Mon Sep 17 00:00:00 2001 From: Bruce Allan Date: Wed, 6 Mar 2013 09:02:31 +0000 Subject: [PATCH] e1000e: additional error handling on PHY register accesses PHY reads/writes via the MDIC register could potentially return results from a previous PHY register access. If that happens, the offset in the returned results will be that of the previous access and if that is different from the expected offset, log a debug message and error out. Signed-off-by: Bruce Allan Tested-by: Aaron Brown Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/e1000e/defines.h | 1 + drivers/net/ethernet/intel/e1000e/phy.c | 12 ++++++++++++ 2 files changed, 13 insertions(+) diff --git a/drivers/net/ethernet/intel/e1000e/defines.h b/drivers/net/ethernet/intel/e1000e/defines.h index b7c664f2a95f..a6aeb195390f 100644 --- a/drivers/net/ethernet/intel/e1000e/defines.h +++ b/drivers/net/ethernet/intel/e1000e/defines.h @@ -788,6 +788,7 @@ GG82563_REG(194, 18) /* Inband Control */ /* MDI Control */ +#define E1000_MDIC_REG_MASK 0x001F0000 #define E1000_MDIC_REG_SHIFT 16 #define E1000_MDIC_PHY_SHIFT 21 #define E1000_MDIC_OP_WRITE 0x04000000 diff --git a/drivers/net/ethernet/intel/e1000e/phy.c b/drivers/net/ethernet/intel/e1000e/phy.c index 60dbf022e986..cbb310fb7d9f 100644 --- a/drivers/net/ethernet/intel/e1000e/phy.c +++ b/drivers/net/ethernet/intel/e1000e/phy.c @@ -178,6 +178,12 @@ s32 e1000e_read_phy_reg_mdic(struct e1000_hw *hw, u32 offset, u16 *data) e_dbg("MDI Error\n"); return -E1000_ERR_PHY; } + if (((mdic & E1000_MDIC_REG_MASK) >> E1000_MDIC_REG_SHIFT) != offset) { + e_dbg("MDI Read offset error - requested %d, returned %d\n", + offset, + (mdic & E1000_MDIC_REG_MASK) >> E1000_MDIC_REG_SHIFT); + return -E1000_ERR_PHY; + } *data = (u16)mdic; /* Allow some time after each MDIC transaction to avoid @@ -236,6 +242,12 @@ s32 e1000e_write_phy_reg_mdic(struct e1000_hw *hw, u32 offset, u16 data) e_dbg("MDI Error\n"); return -E1000_ERR_PHY; } + if (((mdic & E1000_MDIC_REG_MASK) >> E1000_MDIC_REG_SHIFT) != offset) { + e_dbg("MDI Write offset error - requested %d, returned %d\n", + offset, + (mdic & E1000_MDIC_REG_MASK) >> E1000_MDIC_REG_SHIFT); + return -E1000_ERR_PHY; + } /* Allow some time after each MDIC transaction to avoid * reading duplicate data in the next MDIC transaction. -- 2.20.1