Backported from commit bfa36802d1 ("virtio-blk: avoid using ioeventfd
state in irqfd conditional") because the rework/rename dataplane ->
ioeventfd didn't happen yet.
Reported in the community forum [0] and reproduced doing a backup loop
to PBS with suspend mode with fio doing heavy IO in the guest and
using an RBD storage (with krbd).
[0]: https://forum.proxmox.com/threads/141320
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
