Re: [PATCH v2 2/4] vfio/ap: Make vfio_ap_register_irq_notifier() return a bool

[Markus Armbruster <armbru@redhat.com>]

Cédric Le Goater <clg@redhat.com> writes:

> Since vfio_ap_register_irq_notifier() takes and 'Error **' argument,
> best practices suggest to return a bool. See the qapi/error.h Rules
> section.
>
> Signed-off-by: Cédric Le Goater <clg@redhat.com>
> ---
>  hw/vfio/ap.c | 15 ++++++++-------
>  1 file changed, 8 insertions(+), 7 deletions(-)
>
> diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c
> index 03f8ffaa5e2bf13cf8daa2f44aa4cf17809abd94..8bb024e2fde4a1d72346dee4b662d762374326b9 100644
> --- a/hw/vfio/ap.c
> +++ b/hw/vfio/ap.c
> @@ -70,7 +70,7 @@ static void vfio_ap_req_notifier_handler(void *opaque)
>      }
>  }
>  
> -static void vfio_ap_register_irq_notifier(VFIOAPDevice *vapdev,
> +static bool vfio_ap_register_irq_notifier(VFIOAPDevice *vapdev,
>                                            unsigned int irq, Error **errp)
>  {
>      int fd;
> @@ -87,13 +87,13 @@ static void vfio_ap_register_irq_notifier(VFIOAPDevice *vapdev,
>          break;
>      default:
>          error_setg(errp, "vfio: Unsupported device irq(%d)", irq);
> -        return;
> +        return false;
>      }
>  
>      if (vdev->num_irqs < irq + 1) {
>          error_setg(errp, "vfio: IRQ %u not available (number of irqs %u)",
>                     irq, vdev->num_irqs);
> -        return;
> +        return false;
>      }
>  
>      argsz = sizeof(*irq_info);
> @@ -104,14 +104,14 @@ static void vfio_ap_register_irq_notifier(VFIOAPDevice *vapdev,
>      if (ioctl(vdev->fd, VFIO_DEVICE_GET_IRQ_INFO,
>                irq_info) < 0 || irq_info->count < 1) {
>          error_setg_errno(errp, errno, "vfio: Error getting irq info");
> -        return;
> +        return false;
>      }
>  
>      if (event_notifier_init(notifier, 0)) {
>          error_setg_errno(errp, errno,
>                           "vfio: Unable to init event notifier for irq (%d)",
>                           irq);
> -        return;
> +        return false;
>      }
>  
>      fd = event_notifier_get_fd(notifier);
> @@ -122,6 +122,8 @@ static void vfio_ap_register_irq_notifier(VFIOAPDevice *vapdev,
>          qemu_set_fd_handler(fd, NULL, NULL, vapdev);
>          event_notifier_cleanup(notifier);
>      }
> +
> +    return true;
>  }
>  
>  static void vfio_ap_unregister_irq_notifier(VFIOAPDevice *vapdev,
> @@ -167,8 +169,7 @@ static void vfio_ap_realize(DeviceState *dev, Error **errp)
>          goto error;
>      }
>  
> -    vfio_ap_register_irq_notifier(vapdev, VFIO_AP_REQ_IRQ_INDEX, &err);
> -    if (err) {
> +    if (!vfio_ap_register_irq_notifier(vapdev, VFIO_AP_REQ_IRQ_INDEX, &err)) {
>          /*
>           * Report this error, but do not make it a failing condition.
>           * Lack of this IRQ in the host does not prevent normal operation.
            */
           error_report_err(err);

Not this patch's problem, but here goes anyway: since this isn't an
error, we shouldn't use error_report_err().  Would warn_report_err() be
appropriate?  info_report_err() doesn't exist, but it could.

This patch is fine as is, so
Reviewed-by: Markus Armbruster <armbru@redhat.com>