[PATCH v4 09/13] iommu/arm-smmu-v3: Implement set_dev_pasid

[Michael Shavit]

On Wed, Jun 21, 2023 at 2:44 PM Michael Shavit <mshavit at google.com> wrote:
> +       mutex_lock(&arm_smmu_asid_lock);
> +       ret = arm_smmu_write_ctx_desc(master->smmu, master->s1_cfg, master,
> +                                     pasid, &smmu_domain->cd);
> +       if (ret) {
> +               mutex_unlock(&arm_smmu_asid_lock);
> +               kfree(attached_domain);
> +       }
> +
> +       spin_lock_irqsave(&smmu_domain->attached_domains_lock, flags);
> +       list_add(&attached_domain->domain_head, &smmu_domain->attached_domains);
> +       spin_unlock_irqrestore(&smmu_domain->attached_domains_lock, flags);
> +       mutex_unlock(&arm_smmu_asid_lock);
> +
> +       return 0;

A small bug in this patch as well: we return 0 when
arm_smmu_write_ctx_desc() fails instead of the error. Will upload fix
in v5.