Re: [PATCH] vfio/ap: Use g_autofree variable

[Markus Armbruster <armbru@redhat.com>]

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

> Also change the return value of vfio_ap_register_irq_notifier() to be
> a bool since it takes and 'Error **' argument. See the qapi/error.h
> Rules section.
>
> Signed-off-by: Cédric Le Goater <clg@redhat.com>

Split the patch?

If not, the bigger part by far is the return value change, so I'd put
that into the subject.

> ---
>  hw/vfio/ap.c | 19 ++++++++-----------
>  1 file changed, 8 insertions(+), 11 deletions(-)
>
> diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c
> index 7c4caa5938636937680fec87e999249ac84a4498..8bb024e2fde4a1d72346dee4b662d762374326b9 100644
> --- a/hw/vfio/ap.c
> +++ b/hw/vfio/ap.c
> @@ -70,14 +70,14 @@ 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;
>      size_t argsz;
>      IOHandler *fd_read;
>      EventNotifier *notifier;
> -    struct vfio_irq_info *irq_info;
> +    g_autofree struct vfio_irq_info *irq_info = NULL;
>      VFIODevice *vdev = &vapdev->vdev;
>  
>      switch (irq) {
> @@ -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");
> -        goto out_free_info;
> +        return false;
>      }
>  
>      if (event_notifier_init(notifier, 0)) {
>          error_setg_errno(errp, errno,
>                           "vfio: Unable to init event notifier for irq (%d)",
>                           irq);
> -        goto out_free_info;
> +        return false;
>      }
>  
>      fd = event_notifier_get_fd(notifier);
> @@ -123,9 +123,7 @@ static void vfio_ap_register_irq_notifier(VFIOAPDevice *vapdev,
>          event_notifier_cleanup(notifier);
>      }
>  
> -out_free_info:
> -    g_free(irq_info);
> -
> +    return true;
>  }
>  
>  static void vfio_ap_unregister_irq_notifier(VFIOAPDevice *vapdev,
> @@ -171,8 +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.

       }

       return;

Reviewed-by: Markus Armbruster <armbru@redhat.com>