Re: [Qemu-devel] [PATCH v2 2/6] pci: Add comment for pci_add_capability2()

[Marcel Apfelbaum <marcel@redhat.com>]

On 02/06/2017 10:54, Mao Zhongyi wrote:
> Add a comment for pci_add_capability2() to explain the return
> value. This may help to make a correct return value check for
> its callers.
> 
> Cc: mst@redhat.com
> Cc: marcel@redhat.com
> Cc: armbru@redhat.com
> Suggested-by: Markus Armbruster <armbru@redhat.com>
> Signed-off-by: Mao Zhongyi <maozy.fnst@cn.fujitsu.com>
> ---
>   hw/pci/pci.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
> index 53566b8..9810d5f 100644
> --- a/hw/pci/pci.c
> +++ b/hw/pci/pci.c
> @@ -2276,6 +2276,10 @@ int pci_add_capability(PCIDevice *pdev, uint8_t cap_id,
>       return ret;
>   }
>   
> +/*
> + * On success, pci_add_capability2() returns a positive value.

Hi,
I would specify what is the return value: the offset of the pci capability.

Thanks,
Marcel

> + * On failure, it sets an error and returns a negative value.
> + */
>   int pci_add_capability2(PCIDevice *pdev, uint8_t cap_id,
>                          uint8_t offset, uint8_t size,
>                          Error **errp)
>