From: Dmitry Osipenko <digetx@gmail.com>
To: Nicolin Chen <nicoleotsuka@gmail.com>
Cc: linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
jonathanh@nvidia.com, thierry.reding@gmail.com,
linux-tegra@vger.kernel.org
Subject: Re: [PATCH v4 2/3] iommu/tegra-smmu: Rework tegra_smmu_probe_device()
Date: Fri, 2 Oct 2020 21:20:43 +0300 [thread overview]
Message-ID: <11aae4e2-6173-bf83-5970-a03f09e31c47@gmail.com> (raw)
In-Reply-To: <20201002180120.GB29706@Asurada-Nvidia>
02.10.2020 21:01, Nicolin Chen пишет:
> On Fri, Oct 02, 2020 at 05:23:14PM +0300, Dmitry Osipenko wrote:
>> 02.10.2020 09:08, Nicolin Chen пишет:
>>> static struct iommu_device *tegra_smmu_probe_device(struct device *dev)
>>> {
>>> - struct device_node *np = dev->of_node;
>>> - struct tegra_smmu *smmu = NULL;
>>> - struct of_phandle_args args;
>>> - unsigned int index = 0;
>>> - int err;
>>> -
>>> - while (of_parse_phandle_with_args(np, "iommus", "#iommu-cells", index,
>>> - &args) == 0) {
>>> - smmu = tegra_smmu_find(args.np);
>>> - if (smmu) {
>>> - err = tegra_smmu_configure(smmu, dev, &args);
>>> - of_node_put(args.np);
>>> -
>>> - if (err < 0)
>>> - return ERR_PTR(err);
>>> -
>>> - /*
>>> - * Only a single IOMMU master interface is currently
>>> - * supported by the Linux kernel, so abort after the
>>> - * first match.
>>> - */
>>> - dev_iommu_priv_set(dev, smmu);
>>> -
>>> - break;
>>> - }
>>> -
>>> - of_node_put(args.np);
>>> - index++;
>>> - }
>>> + struct tegra_smmu *smmu = dev_iommu_priv_get(dev);
>>>
>>> if (!smmu)
>>> return ERR_PTR(-ENODEV);
>>
>> The !smmu can't ever be true now, isn't it? Then please remove it.
>
> How can you be so sure? Have you read my commit message? The whole
> point of removing the hack in tegra_smmu_probe() is to return the
> ERR_PTR(-ENODEV) here. The bus_set_iommu() will call this function
> when mc->smmu is not assigned it, as it's assigned after we return
> tegra_smmu_probe() while bus_set_iommu() is still in the middle of
> the tegra_smmu_probe().
>
My bad, I probably missed that was looking at the probe_device(), looks
good then.
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next prev parent reply other threads:[~2020-10-02 18:20 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-02 6:08 [PATCH v4 0/3] iommu/tegra-smmu: Add PCI support Nicolin Chen
2020-10-02 6:08 ` [PATCH v4 1/3] iommu/tegra-smmu: Use fwspec in tegra_smmu_(de)attach_dev Nicolin Chen
2020-10-02 14:22 ` Dmitry Osipenko
2020-10-02 14:52 ` Dmitry Osipenko
2020-10-02 19:56 ` Nicolin Chen
2020-10-02 14:26 ` Dmitry Osipenko
2020-10-02 14:41 ` Dmitry Osipenko
2020-10-02 19:45 ` Nicolin Chen
2020-10-02 20:12 ` Dmitry Osipenko
2020-10-02 23:53 ` Nicolin Chen
2020-10-03 4:01 ` Dmitry Osipenko
2020-10-02 6:08 ` [PATCH v4 2/3] iommu/tegra-smmu: Rework tegra_smmu_probe_device() Nicolin Chen
2020-10-02 14:22 ` Dmitry Osipenko
2020-10-02 14:58 ` Dmitry Osipenko
2020-10-02 19:53 ` Nicolin Chen
2020-10-05 9:47 ` Thierry Reding
2020-10-02 14:22 ` Dmitry Osipenko
2020-10-02 14:50 ` Dmitry Osipenko
2020-10-05 9:53 ` Thierry Reding
2020-10-05 10:36 ` Dmitry Osipenko
2020-10-05 11:15 ` Thierry Reding
2020-10-05 13:28 ` Dmitry Osipenko
2020-10-05 14:22 ` Thierry Reding
2020-10-05 9:51 ` Thierry Reding
2020-10-02 14:23 ` Dmitry Osipenko
2020-10-02 18:01 ` Nicolin Chen
2020-10-02 18:20 ` Dmitry Osipenko [this message]
2020-10-02 15:02 ` Dmitry Osipenko
2020-10-02 18:58 ` Nicolin Chen
2020-10-05 9:57 ` Thierry Reding
2020-10-06 1:05 ` Nicolin Chen
2020-10-08 9:53 ` Thierry Reding
2020-10-08 21:12 ` Nicolin Chen
2020-10-09 12:25 ` Thierry Reding
2020-10-09 15:54 ` Nicolin Chen
2020-10-02 15:23 ` Dmitry Osipenko
2020-10-02 16:00 ` Dmitry Osipenko
2020-10-02 16:37 ` Dmitry Osipenko
2020-10-02 16:50 ` Dmitry Osipenko
2020-10-02 6:08 ` [PATCH v4 3/3] iommu/tegra-smmu: Add PCI support Nicolin Chen
2020-10-02 14:35 ` Dmitry Osipenko
2020-10-02 17:45 ` Nicolin Chen
2020-10-02 18:04 ` Dmitry Osipenko
2020-10-02 18:04 ` Dmitry Osipenko
2020-10-05 10:04 ` Thierry Reding
2020-10-06 0:54 ` Nicolin Chen
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