sub do_something
{
 my $param = shift;
 
  # just add a test for success here:
 my $info = get_info($param) || get_info('option 1');

 # more things happen
 do_something_else($param, $info);
}

sub get_info
{
 my $param = shift;
 
 my $info;
 if($param eq 'option 1')
 {
  $info = 'blah';
 }
 elsif($param eq 'option 2')
 {
  return unless # <-- test whether a failure occurred; return undef
    do_something_that_might_fail($param) #POINT A
  $info = 'foo';
 }
 else
 {
  $info = 'bar''
 }
 return $info;
}