RE: [PATCH rc v3] iommufd/fault: Use a separate spinlock to protect fault->deliver list

[Tian, Kevin]

> From: Nicolin Chen <nicolinc@xxxxxxxxxx>
> Sent: Friday, January 17, 2025 10:05 AM
> 
>  	mutex_lock(&fault->mutex);

Nit. The scope of above can be reduced too, by guarding only the
lines for fault->response.

Perhaps Jason can help adjust it when picking it in.

> +	spin_lock(&fault->lock);
>  	list_for_each_entry_safe(group, next, &fault->deliver, node) {
>  		if (group->attach_handle != &handle->handle)
>  			continue;
> +		list_move(&group->node, &free_list);
> +	}
> +	spin_unlock(&fault->lock);
> +
> +	list_for_each_entry_safe(group, next, &free_list, node) {
>  		list_del(&group->node);
>  		iopf_group_response(group, IOMMU_PAGE_RESP_INVALID);
>  		iopf_free_group(group);