commit 8174acd8c808337863ccb516a1a888deb574d18b
author Alexey Kardashevskiy <aik@ozlabs.ru> Mon Mar 09 23:43:17 2020 +0100
committer Alexey Kardashevskiy <aik@ozlabs.ru> Wed Mar 11 15:43:22 2020 +1100
tree 331698dc4a37580a59d8eb8c72304117956d6030
parent cf28264196e596c11d0d47f6150dfef5c0e4239f

virtio-serial: Close device completely

Linux closes stdout at the end of prom_init which triggers the FW quiesce
code which closes the virtio-serial instance. This misses stopping the
virtio queues. However this seemed working for a little longer (until the
Linux driver took over) till 300384f3dc68 which moved the VQ descriptors
around which caused use-after-free corruption.

This adds virtio_queue_term_vq(), cleanup in the forth driver and a few
checks.

Fixes: 300384f3dc68 ("virtio: Store queue descriptors in virtio_device")
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
[groug: - fix changelog
        - don't restore emit]
Signed-off-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>