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    virtio-balloon: fix add/get API use · 9c378abc
    Michael S. Tsirkin 提交于
    Since ee7cd898 'virtio: expose added
    descriptors immediately.', in virtio balloon virtqueue_get_buf might
    now run concurrently with virtqueue_kick.  I audited both and this
    seems safe in practice but this is not guaranteed by the API.
    Additionally, a spurious interrupt might in theory make
    virtqueue_get_buf run in parallel with virtqueue_add_buf, which is
    racy.
    
    While we might try to protect against spurious callbacks it's
    easier to fix the driver: balloon seems to be the only one
    (mis)using the API like this, so let's just fix balloon.
    Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
    Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (removed unused var)
    9c378abc
virtio_balloon.c 11.6 KB