[Bug 280098] 9pfs panics on qemu+kvm

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280098

Mark Peek <mp@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mp@FreeBSD.org

--- Comment #4 from Mark Peek <mp@FreeBSD.org> ---
This untested patch is along the same lines as yours but might be a little
cleaner.

diff --git a/sys/dev/virtio/p9fs/virtio_p9fs.c
b/sys/dev/virtio/p9fs/virtio_p9fs.c
index aa174d3bd5ba..3600e0ea09c9 100644
--- a/sys/dev/virtio/p9fs/virtio_p9fs.c
+++ b/sys/dev/virtio/p9fs/virtio_p9fs.c
@@ -352,9 +352,9 @@ vt9p_attach(device_t dev)
        mount_tag = malloc(mount_tag_len + 1, M_P9FS_MNTTAG,
            M_WAITOK | M_ZERO);

-       virtio_read_device_config(dev,
+       virtio_read_device_config_array(dev,
            offsetof(struct virtio_9pnet_config, mount_tag),
-           mount_tag, mount_tag_len);
+           mount_tag, 1, mount_tag_len);

        device_printf(dev, "Mount tag: %s\n", mount_tag);

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