Keeping the pvid at 0 when VLAN-unaware makes it possible to drop the hack introduced in commit920eaab1d8("kernel: DSA roaming fix for Marvell mv88e6xxx"). Dropping the hack makes it possible to use VLAN interfaces with VID 1 on DSA ports without problems with FDB. Signed-off-by: Marek Behún <kabel@kernel.org> (cherry picked from commit9caa6f0aa7) Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com> [drop kernel patch hack from Linux version 5.15, drop paragraph about backport patch, which is not necessary as it is included in kernel 5.15]