Re: [Qemu-devel] [PATCH v2 06/10] hw/audio/ac97: Use the QOM DEVICE() macro to access DeviceState.qdev

[Peter Maydell <peter.maydell@linaro.org>]

On Tue, 28 May 2019 at 17:42, Philippe Mathieu-Daudé <philmd@redhat.com> wrote:
>
> Rather than looking inside the definition of a DeviceState with
> "s->qdev", use the QOM prefered style: "DEVICE(s)".
>
> This patch was generated using the following Coccinelle script
> (with a bit of manual fix-up, removing an extra space to please
> checkpatch.pl):
>
>     // Use DEVICE() macros to access DeviceState.qdev
>     @use_device_macro_to_access_qdev@
>     expression obj;
>     identifier dev;
>     @@
>     -&obj->dev.qdev
>     +DEVICE(obj)
>
> Suggested-by: Peter Maydell <peter.maydell@linaro.org>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
>  hw/audio/ac97.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/hw/audio/ac97.c b/hw/audio/ac97.c
> index 2265622d44..a4e8d99e77 100644
> --- a/hw/audio/ac97.c
> +++ b/hw/audio/ac97.c
> @@ -1388,7 +1388,7 @@ static void ac97_realize(PCIDevice *dev, Error **errp)
>      pci_register_bar (&s->dev, 0, PCI_BASE_ADDRESS_SPACE_IO, &s->io_nam);
>      pci_register_bar (&s->dev, 1, PCI_BASE_ADDRESS_SPACE_IO, &s->io_nabm);
>      AUD_register_card ("ac97", &s->card);
> -    ac97_on_reset (&s->dev.qdev);
> +    ac97_on_reset(DEVICE(s));
>  }

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>.

As an aside, this function has a lot of uses of "&s->dev" to
get the PCIDevice* given an AC97LinkState*. This isn't
necessary as the function has been passed the PCIDevice*
as its argument, so all the uses of "&s->dev" here could
just be written as "dev".

thanks
-- PMM