Re: [PATCH] spapr: Assert DIMM unplug state in spapr_memory_unplug()

[Daniel Henrique Barboza <danielhb413@gmail.com>]

On 3/13/21 4:23 AM, Greg Kurz wrote:
> spapr_memory_unplug() is the last step of the hot unplug sequence.
> It is indirectly called by:
> 
>   spapr_lmb_release()
>    hotplug_handler_unplug()
> 
> and spapr_lmb_release() already buys us that DIMM unplug state is
> present : it gets restored with spapr_recover_pending_dimm_state()
> if missing.
> 
> g_assert() that spapr_pending_dimm_unplugs_find() cannot return NULL
> in spapr_memory_unplug() to make this clear and silence Coverity.
> 
> Fixes: Coverity CID 1450767
> Signed-off-by: Greg Kurz <groug@kaod.org>
> ---

Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>

>   hw/ppc/spapr.c |    3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index d56418ca2942..73a06df3b1b1 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -3660,6 +3660,9 @@ static void spapr_memory_unplug(HotplugHandler *hotplug_dev, DeviceState *dev)
>       SpaprMachineState *spapr = SPAPR_MACHINE(hotplug_dev);
>       SpaprDimmState *ds = spapr_pending_dimm_unplugs_find(spapr, PC_DIMM(dev));
>   
> +    /* We really shouldn't get this far without anything to unplug */
> +    g_assert(ds);
> +
>       pc_dimm_unplug(PC_DIMM(dev), MACHINE(hotplug_dev));
>       qdev_unrealize(dev);
>       spapr_pending_dimm_unplugs_remove(spapr, ds);
> 
>