On Tue, May 14, 2024 at 11:16:19AM GMT, Tomasz Jeznach wrote:
...
> +static int riscv_iommu_bond_link(struct riscv_iommu_domain *domain,
> + struct device *dev)
> +{
> + struct riscv_iommu_device *iommu = dev_to_iommu(dev);
> + struct riscv_iommu_bond *bond;
> + struct list_head *bonds;
> +
> + bond = kzalloc(sizeof(*bond), GFP_KERNEL);
> + if (!bond)
> + return -ENOMEM;
> + bond->dev = dev;
> +
> + /*
> + * List of devices attached to the domain is arranged based on
> + * managed IOMMU device.
> + */
> +
> + spin_lock(&domain->lock);
> + list_for_each_rcu(bonds, &domain->bonds)
> + if (dev_to_iommu(list_entry(bonds, struct riscv_iommu_bond, list)->dev) == iommu)
> + break;
We should wrap this list_for_each_rcu() in rcu_read_lock() and
rcu_read_unlock().
Thanks,
drew
> + list_add_rcu(&bond->list, bonds);
> + spin_unlock(&domain->lock);
> +
> + /* Synchronize with riscv_iommu_iotlb_inval() sequence. See comment below. */
> + smp_mb();
> +
> + return 0;
> +}
