Re: [Qemu-devel] [PATCH 05/14] nvdimm acpi: clean up nvdimm_build_acpi

[Igor Mammedov <imammedo@redhat.com>]

On Mon,  7 Nov 2016 19:13:40 +0800
Xiao Guangrong <guangrong.xiao@linux.intel.com> wrote:

> To make the code more clearer, we
> 1) check ram_slots first, and build ssdt & nfit only when it is available
> 2) use nvdimm_get_plugged_device_list() to check if there is nvdimm device
>    plugged
> 
> Suggested-by: Igor Mammedov <imammedo@redhat.com>
> Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
> ---
Reviewed-by: Igor Mammedov <imammedo@redhat.com>

>  hw/acpi/nvdimm.c | 30 ++++++++++++++++--------------
>  1 file changed, 16 insertions(+), 14 deletions(-)
> 
> diff --git a/hw/acpi/nvdimm.c b/hw/acpi/nvdimm.c
> index 5156565..65eb6c9 100644
> --- a/hw/acpi/nvdimm.c
> +++ b/hw/acpi/nvdimm.c
> @@ -392,12 +392,6 @@ static void nvdimm_build_nfit(AcpiNVDIMMState *state, GArray *table_offsets,
>      NvdimmFitBuffer *fit_buf = &state->fit_buf;
>      unsigned int header;
>  
> -
> -    /* NVDIMM device is not plugged? */
> -    if (!fit_buf->fit->len) {
> -        return;
> -    }
> -
>      acpi_add_table(table_offsets, table_data);
>  
>      /* NFIT header. */
> @@ -1275,14 +1269,22 @@ void nvdimm_build_acpi(GArray *table_offsets, GArray *table_data,
>                         BIOSLinker *linker, AcpiNVDIMMState *state,
>                         uint32_t ram_slots)
>  {
> -    nvdimm_build_nfit(state, table_offsets, table_data, linker);
> +    GSList *device_list;
>  
> -    /*
> -     * NVDIMM device is allowed to be plugged only if there is available
> -     * slot.
> -     */
> -    if (ram_slots) {
> -        nvdimm_build_ssdt(table_offsets, table_data, linker, state->dsm_mem,
> -                          ram_slots);
> +    /* no nvdimm device can be plugged. */
> +    if (!ram_slots) {
> +        return;
>      }
> +
> +    nvdimm_build_ssdt(table_offsets, table_data, linker, state->dsm_mem,
> +                      ram_slots);
> +
> +    device_list = nvdimm_get_plugged_device_list();
> +    /* no NVDIMM device is plugged. */
> +    if (!device_list) {
> +        return;
> +    }
> +
> +    nvdimm_build_nfit(state, table_offsets, table_data, linker);
> +    g_slist_free(device_list);
>  }