Re: [Xen-devel] [PATCH RFC 1 5/8] xen/pt: Log xen_host_pci_get/set errors in MSI code.

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Mon, 29 Jun 2015, Konrad Rzeszutek Wilk wrote:
> We seem to only use these functions when de-activating the
> MSI - so just log errors.
> 
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>

Reviewed-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>


>  hw/xen/xen_pt_msi.c | 18 ++++++++++++++----
>  1 file changed, 14 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/xen/xen_pt_msi.c b/hw/xen/xen_pt_msi.c
> index 5822df5..e3d7194 100644
> --- a/hw/xen/xen_pt_msi.c
> +++ b/hw/xen/xen_pt_msi.c
> @@ -75,19 +75,29 @@ static int msi_msix_enable(XenPCIPassthroughState *s,
>                             bool enable)
>  {
>      uint16_t val = 0;
> +    int rc;
>  
>      if (!address) {
>          return -1;
>      }
>  
> -    xen_host_pci_get_word(&s->real_device, address, &val);
> +    rc = xen_host_pci_get_word(&s->real_device, address, &val);
> +    if (rc) {
> +        XEN_PT_ERR(&s->dev, "Failed to read MSI/MSI-X register (0x%x), 
> rc:%d\n",
> +                   address, rc);
> +        return rc;
> +    }
>      if (enable) {
>          val |= flag;
>      } else {
>          val &= ~flag;
>      }
> -    xen_host_pci_set_word(&s->real_device, address, val);
> -    return 0;
> +    rc = xen_host_pci_set_word(&s->real_device, address, val);
> +    if (rc) {
> +        XEN_PT_ERR(&s->dev, "Failed to write MSI/MSI-X register (0x%x), 
> rc:%d\n",
> +                   address, rc);
> +    }
> +    return rc;
>  }
>  
>  static int msi_msix_setup(XenPCIPassthroughState *s,
> @@ -276,7 +286,7 @@ void xen_pt_msi_disable(XenPCIPassthroughState *s)
>          return;
>      }
>  
> -    xen_pt_msi_set_enable(s, false);
> +    (void)xen_pt_msi_set_enable(s, false);
>  
>      msi_msix_disable(s, msi_addr64(msi), msi->data, msi->pirq, false,
>                       msi->initialized);
> -- 
> 2.1.0
> 

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