code: func ValidateCSIDriverUpdate(new, old *storage.CSIDriver) field.ErrorList {
  	allErrs := ValidateCSIDriver(new)
  
  	// Spec is read-only
  	// If this ever relaxes in the future, make sure to increment the Generation number in PrepareForUpdate
  	if !apiequality.Semantic.DeepEqual(old.Spec, new.Spec) {
  		allErrs = append(allErrs, field.Invalid(field.NewPath("spec"), new.Spec, "field is immutable"))
  	}
  	return allErrs
  }
docs: // ValidateCSIDriverUpdate validates a CSIDriver.