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virtio-serial: don't set MULTIPORT for 1 port dev 

Since commit 98b19252cf, all
serial devices declare MULTIPORT feature.
To allow 0.12 compatibility, we should clear this when
max_nr_ports is 1.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Michael S. Tsirkin 2010-02-15 20:43:56 +05:30 committed by Anthony Liguori
parent 8bfbde6d35
commit ee4d45be0d
1 changed files with 4 additions and 2 deletions
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6
hw/virtio-serial-bus.c
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@ -335,8 +335,10 @@ static void handle_input(VirtIODevice *vdev, VirtQueue *vq)
static uint32_t get_features(VirtIODevice *vdev, uint32_t features)
{
features |= (1 << VIRTIO_CONSOLE_F_MULTIPORT);
VirtIOSerial *vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
if (vser->bus->max_nr_ports > 1) {
features |= (1 << VIRTIO_CONSOLE_F_MULTIPORT);
}
return features;
}