Since virtio-ccw doesn't work with accessing to the config space inside an interrupt context, this patch series avoids that issue by moving the config register accesses to the related workqueue contexts.
v3->v4 ChangeLog: - change virtio32_to_cpu to cpu_to_virtio_32 in send_cmd_id_start; v2->v3 ChangeLog: - rename cmd_id_received to cmd_id_received_cache, and have call sites read the latest value via virtio_balloon_cmd_id_received. (Still kept Cornelia and Halil's reviewed-by as it's a minor change) - remove zeroing vb->num_free_page_blocks in probe since vb is allocated via kzalloc. v1->v2 ChangeLog: - add config_read_bitmap to indicate to the workqueue callbacks about the necessity of reading the related config fields.
Wei Wang (3): virtio-balloon: tweak config_changed implementation virtio-balloon: improve update_balloon_size_func virtio_balloon: remove the unnecessary 0-initialization
drivers/virtio/virtio_balloon.c | 104 ++++++++++++++++++++++++++-------------- 1 file changed, 69 insertions(+), 35 deletions(-)