Virtualization - Apr 2021 - [PATCH 1/3] virtio: update reset callback to return status

On Wed, 7 Apr 2021 12:09:22 +0000
Max Gurtovoy <mgurtovoy at nvidia.com> wrote:
> The reset device operation, usually is an operation that might fail from
> various reasons. For example, the controller might be in a bad state and
> can't answer to any request. Usually, the paravirt SW based virtio
> devices always succeed in reset operation but this is not the case for
> HW based virtio devices.
> 
> This commit is also a preparation for adding a timeout mechanism for
> resetting virtio devices.
> 
> Signed-off-by: Max Gurtovoy <mgurtovoy at nvidia.com>
> ---
>  drivers/remoteproc/remoteproc_virtio.c |  3 ++-
>  drivers/virtio/virtio.c                | 22 +++++++++++++++-------
>  drivers/virtio/virtio_mmio.c           |  3 ++-
>  drivers/virtio/virtio_pci_legacy.c     |  3 ++-
>  drivers/virtio/virtio_pci_modern.c     |  3 ++-
>  drivers/virtio/virtio_vdpa.c           |  3 ++-
>  include/linux/virtio_config.h          |  5 +++--
>  7 files changed, 28 insertions(+), 14 deletions(-)
You missed drivers/s390/virtio/virtio_ccw.c.

virtio_ccw_reset() should probably return -ENOMEM on allocation failure
and forward the return code of ccw_io_helper().