warning C28129: An assignment has been made to an operand, which should only be modified using bit sets and clears
The driver is using an assignment to modify an operand. Assigning a value might unintentionally change the values of bits other than those that it needs to change, resulting in unexpected consequences.
The following code example elicits this warning.
fdo->Flags = DO_BUFFERED_IO;
The following code example avoids this warning.
fdo->Flags |= DO_BUFFERED_IO;