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virtio_balloon: fix up endian-ness for free cmd id

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commit 168c358af2f8c5a37f8b5f877ba2cc93995606ee upstream.

free cmd id is read using virtio endian, spec says all fields
in balloon are LE. Fix it up.

Fixes: 86a559787e ("virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT")
Cc: [email protected]
Signed-off-by: Michael S. Tsirkin <[email protected]>
Acked-by: Jason Wang <[email protected]>
Reviewed-by: Wei Wang <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Michael S. Tsirkin 2020-07-27 12:01:27 -04:00 • committed by Greg Kroah-Hartman
commit cea6633d53
1 changed files with 5 additions and 1 deletions
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6
drivers/virtio/virtio_balloon.c
View file

@ -529,10 +529,14 @@ static int init_vqs(struct virtio_balloon *vb)
static u32 virtio_balloon_cmd_id_received(struct virtio_balloon *vb)
{
if (test_and_clear_bit(VIRTIO_BALLOON_CONFIG_READ_CMD_ID,
&vb->config_read_bitmap))
&vb->config_read_bitmap)) {
virtio_cread(vb->vdev, struct virtio_balloon_config,
free_page_report_cmd_id,
&vb->cmd_id_received_cache);
/* Legacy balloon config space is LE, unlike all other devices. */
if (!virtio_has_feature(vb->vdev, VIRTIO_F_VERSION_1))
vb->cmd_id_received_cache = le32_to_cpu((__force __le32)vb->cmd_id_received_cache);
}
return vb->cmd_id_received_cache;
}