On Mon, Feb 01, 2021 at 08:26:41PM +0800, Keqian Zhu wrote:
> > +static int arm_smmu_insert_master(struct arm_smmu_device *smmu,
> > + struct arm_smmu_master *master)
> > +{
> > + int i;
> > + int ret = 0;
> > + struct arm_smmu_stream *new_stream, *cur_stream;
> > + struct rb_node **new_node, *parent_node = NULL;
> > + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(master->dev);
> > +
> > + master->streams = kcalloc(fwspec->num_ids,
> > + sizeof(struct arm_smmu_stream), GFP_KERNEL);
> > + if (!master->streams)
> > + return -ENOMEM;
> > + master->num_streams = fwspec->num_ids;
> This is not roll-backed when fail.
No need, the caller frees master
> > +
> > + mutex_lock(&smmu->streams_mutex);
> > + for (i = 0; i < fwspec->num_ids && !ret; i++) {
> Check ret at here, makes it hard to decide the start index of rollback.
>
> If we fail at here, then start index is (i-2).
> If we fail in the loop, then start index is (i-1).
>
[...]
> > + if (ret) {
> > + for (; i > 0; i--)
> should be (i >= 0)?
> And the start index seems not correct.
Indeed, this whole bit is wrong. I'll fix it while resending the IOPF
series.
Thanks,
Jean
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