On Mon, Nov 07, 2022 at 03:26:45PM +0000, Will Deacon wrote:
> > diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> > index ba47c73f5b8c..01fd7df16cb9 100644
> > --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> > +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> > @@ -2430,23 +2430,14 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
> > goto out_unlock;
> > }
> > } else if (smmu_domain->smmu != smmu) {
> > - dev_err(dev,
> > - "cannot attach to SMMU %s (upstream of %s)\n",
> > - dev_name(smmu_domain->smmu->dev),
> > - dev_name(smmu->dev));
> > - ret = -ENXIO;
> > + ret = -EINVAL;
> > goto out_unlock;
> > } else if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1 &&
> > master->ssid_bits != smmu_domain->s1_cfg.s1cdmax) {
> > - dev_err(dev,
> > - "cannot attach to incompatible domain (%u SSID bits != %u)\n",
> > - smmu_domain->s1_cfg.s1cdmax, master->ssid_bits);
> > ret = -EINVAL;
> > goto out_unlock;
> > } else if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1 &&
> > smmu_domain->stall_enabled != master->stall_enabled) {
> > - dev_err(dev, "cannot attach to stall-%s domain\n",
> > - smmu_domain->stall_enabled ? "enabled" : "disabled");
> > ret = -EINVAL;
> > goto out_unlock;
> > }
> I think it would be helpful to preserve these messages using
> dev_err_ratelimited() so that attach failure can be diagnosed without
> having to hack the messages back into the driver.
Thank you for the review.
The change is already picked up last week. Yet, I can add prints
back with a followup patch, if no one has a problem with that.
Also, I am not quite sure what the use case would be to have an
error print. Perhaps dev_dbg() would be more fitting if it is
just for diagnosis?
Thanks
Nic
