Re: [PATCH v3 3/7] spapr_drc.c: use spapr_drc_release() in isolate_physical/set_unusable

[Greg Kurz <groug@kaod.org>]

On Thu, 11 Feb 2021 19:52:42 -0300
Daniel Henrique Barboza <danielhb413@gmail.com> wrote:

> When moving a physical DRC to "Available", drc_isolate_physical() will
> move the DRC state to STATE_PHYSICAL_POWERON and, if the DRC is marked
> for unplug, call spapr_drc_detach(). For physical DRCs, drck->empty_state
> is STATE_PHYSICAL_POWERON, meaning that we're sure that spapr_drc_detach()
> will end up calling spapr_drc_release() in the end.
> 
> Likewise, for logical DRCs, drc_set_unusable will move the DRC to "Unusable"
> state, setting drc->state to STATE_LOGICAL_UNUSABLE, which is the
> drck->empty_state for logical DRCs. spapr_drc_detach() will call
> spapr_drc_release() in this case as well.
> 
> In both scenarios, spapr_drc_detach() is being used as a spapr_drc_release(),
> wrapper, where we also set unplug_requested (which is already true, otherwise
> spapr_drc_detach() wouldn't be called in the first place) and check if
> drc->state == drck->empty_state, which we also know it's guaranteed to
> be true because we just set it.
> 
> Just use spapr_drc_release() in these functions to be clear of our intentions
> in both these functions.
> 
> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
> ---

Reviewed-by: Greg Kurz <groug@kaod.org>

>  hw/ppc/spapr_drc.c | 32 ++++++++++++++++----------------
>  1 file changed, 16 insertions(+), 16 deletions(-)
> 
> diff --git a/hw/ppc/spapr_drc.c b/hw/ppc/spapr_drc.c
> index 84bd3c881f..555a25517d 100644
> --- a/hw/ppc/spapr_drc.c
> +++ b/hw/ppc/spapr_drc.c
> @@ -50,6 +50,20 @@ uint32_t spapr_drc_index(SpaprDrc *drc)
>          | (drc->id & DRC_INDEX_ID_MASK);
>  }
>  
> +static void spapr_drc_release(SpaprDrc *drc)
> +{
> +    SpaprDrcClass *drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
> +
> +    drck->release(drc->dev);
> +
> +    drc->unplug_requested = false;
> +    g_free(drc->fdt);
> +    drc->fdt = NULL;
> +    drc->fdt_start_offset = 0;
> +    object_property_del(OBJECT(drc), "device");
> +    drc->dev = NULL;
> +}
> +
>  static uint32_t drc_isolate_physical(SpaprDrc *drc)
>  {
>      switch (drc->state) {
> @@ -68,7 +82,7 @@ static uint32_t drc_isolate_physical(SpaprDrc *drc)
>      if (drc->unplug_requested) {
>          uint32_t drc_index = spapr_drc_index(drc);
>          trace_spapr_drc_set_isolation_state_finalizing(drc_index);
> -        spapr_drc_detach(drc);
> +        spapr_drc_release(drc);
>      }
>  
>      return RTAS_OUT_SUCCESS;
> @@ -209,7 +223,7 @@ static uint32_t drc_set_unusable(SpaprDrc *drc)
>      if (drc->unplug_requested) {
>          uint32_t drc_index = spapr_drc_index(drc);
>          trace_spapr_drc_set_allocation_state_finalizing(drc_index);
> -        spapr_drc_detach(drc);
> +        spapr_drc_release(drc);
>      }
>  
>      return RTAS_OUT_SUCCESS;
> @@ -372,20 +386,6 @@ void spapr_drc_attach(SpaprDrc *drc, DeviceState *d)
>                               NULL, 0);
>  }
>  
> -static void spapr_drc_release(SpaprDrc *drc)
> -{
> -    SpaprDrcClass *drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
> -
> -    drck->release(drc->dev);
> -
> -    drc->unplug_requested = false;
> -    g_free(drc->fdt);
> -    drc->fdt = NULL;
> -    drc->fdt_start_offset = 0;
> -    object_property_del(OBJECT(drc), "device");
> -    drc->dev = NULL;
> -}
> -
>  void spapr_drc_detach(SpaprDrc *drc)
>  {
>      SpaprDrcClass *drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);