IPOIB_MCAST_FLAG_FOUND
clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&