ixgbe: fix possible data corruption in read_i2c_byte

This patch makes sure that the SW lock is released after all i2c
operations complete in the retry code path.

Signed-off-by: Emil Tantilov <[email protected]>
Tested-by: Phil Schmitt <[email protected]>
Signed-off-by: Jeff Kirsher <[email protected]>

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
index eb534a071fde39ec4c1fff53926794af2c74a262..d7b5bd04760453b7b4b21fed446f51af1e7a437e 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
@@ -1307,9 +1307,9 @@ s32 ixgbe_read_i2c_byte_generic(struct ixgbe_hw *hw, u8 byte_offset,
                break;
 
 fail:
+               ixgbe_i2c_bus_clear(hw);
                hw->mac.ops.release_swfw_sync(hw, swfw_mask);
                msleep(100);
-               ixgbe_i2c_bus_clear(hw);
                retry++;
                if (retry < max_retry)
                        hw_dbg(hw, "I2C byte read error - Retrying.\n");