From: Jonathan Cameron <jonathan.cameron@huawei.com>
To: Jean-Philippe Brucker <jean-philippe@linaro.org>
Cc: mark.rutland@arm.com, devicetree@vger.kernel.org,
robin.murphy@arm.com, sudeep.holla@arm.com, rjw@rjwysocki.net,
linux-acpi@vger.kernel.org, iommu@lists.linux-foundation.org,
robh+dt@kernel.org, guohanjun@huawei.com,
zhangfei.gao@linaro.org, will@kernel.org,
linux-arm-kernel@lists.infradead.org, lenb@kernel.org
Subject: Re: [PATCH v2 7/8] iommu/arm-smmu-v3: Improve add_device() error handling
Date: Mon, 11 Nov 2019 15:58:30 +0000 [thread overview]
Message-ID: <20191111155830.00000a56@huawei.com> (raw)
In-Reply-To: <20191108152508.4039168-8-jean-philippe@linaro.org>
On Fri, 8 Nov 2019 16:25:07 +0100
Jean-Philippe Brucker <jean-philippe@linaro.org> wrote:
> Let add_device() clean up after itself. The iommu_bus_init() function
> does call remove_device() on error, but other sites (e.g. of_iommu) do
> not.
>
> Don't free level-2 stream tables because we'd have to track if we
> allocated each of them or if they are used by other endpoints. It's not
> worth the hassle since they are managed resources.
>
> Reviewed-by: Eric Auger <eric.auger@redhat.com>
> Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Potentially some fun around reordering of last few actions, but
doesn't seem there is any real connection between them so should be
fine.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> ---
> drivers/iommu/arm-smmu-v3.c | 28 +++++++++++++++++++++-------
> 1 file changed, 21 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
> index 82eac89ee187..88ec0bf33492 100644
> --- a/drivers/iommu/arm-smmu-v3.c
> +++ b/drivers/iommu/arm-smmu-v3.c
> @@ -2826,14 +2826,16 @@ static int arm_smmu_add_device(struct device *dev)
> for (i = 0; i < master->num_sids; i++) {
> u32 sid = master->sids[i];
>
> - if (!arm_smmu_sid_in_range(smmu, sid))
> - return -ERANGE;
> + if (!arm_smmu_sid_in_range(smmu, sid)) {
> + ret = -ERANGE;
> + goto err_free_master;
> + }
>
> /* Ensure l2 strtab is initialised */
> if (smmu->features & ARM_SMMU_FEAT_2_LVL_STRTAB) {
> ret = arm_smmu_init_l2_strtab(smmu, sid);
> if (ret)
> - return ret;
> + goto err_free_master;
> }
> }
>
> @@ -2843,13 +2845,25 @@ static int arm_smmu_add_device(struct device *dev)
> master->ssid_bits = min_t(u8, master->ssid_bits,
> CTXDESC_LINEAR_CDMAX);
>
> + ret = iommu_device_link(&smmu->iommu, dev);
> + if (ret)
> + goto err_free_master;
> +
> group = iommu_group_get_for_dev(dev);
> - if (!IS_ERR(group)) {
> - iommu_group_put(group);
> - iommu_device_link(&smmu->iommu, dev);
> + if (IS_ERR(group)) {
> + ret = PTR_ERR(group);
> + goto err_unlink;
> }
>
> - return PTR_ERR_OR_ZERO(group);
> + iommu_group_put(group);
> + return 0;
> +
> +err_unlink:
> + iommu_device_unlink(&smmu->iommu, dev);
> +err_free_master:
> + kfree(master);
> + fwspec->iommu_priv = NULL;
> + return ret;
> }
>
> static void arm_smmu_remove_device(struct device *dev)
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next prev parent reply other threads:[~2019-11-11 15:58 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-08 15:25 [PATCH v2 0/8] iommu: Add PASID support to Arm SMMUv3 Jean-Philippe Brucker
2019-11-08 15:25 ` [PATCH v2 1/8] dt-bindings: document PASID property for IOMMU masters Jean-Philippe Brucker
2019-11-08 15:25 ` [PATCH v2 2/8] iommu/arm-smmu-v3: Support platform SSID Jean-Philippe Brucker
2019-11-08 15:25 ` [PATCH v2 3/8] ACPI/IORT: Support PASID for platform devices Jean-Philippe Brucker
2019-11-14 6:42 ` Hanjun Guo
2019-11-08 15:25 ` [PATCH v2 4/8] iommu/arm-smmu-v3: Prepare for SSID support Jean-Philippe Brucker
2019-11-11 14:38 ` Jonathan Cameron
2019-11-22 15:28 ` Jean-Philippe Brucker
2019-11-08 15:25 ` [PATCH v2 5/8] iommu/arm-smmu-v3: Add support for Substream IDs Jean-Philippe Brucker
2019-11-11 15:12 ` Jonathan Cameron
2019-11-08 15:25 ` [PATCH v2 6/8] iommu/arm-smmu-v3: Add second level of context descriptor table Jean-Philippe Brucker
2019-11-11 15:50 ` Jonathan Cameron
2019-11-22 15:32 ` Jean-Philippe Brucker
2019-11-08 15:25 ` [PATCH v2 7/8] iommu/arm-smmu-v3: Improve add_device() error handling Jean-Philippe Brucker
2019-11-11 15:58 ` Jonathan Cameron [this message]
2019-11-08 15:25 ` [PATCH v2 8/8] iommu/arm-smmu-v3: Add support for PCI PASID Jean-Philippe Brucker
2019-11-11 16:05 ` Jonathan Cameron
2019-11-22 15:33 ` Jean-Philippe Brucker
2019-11-12 10:02 ` [PATCH v2 0/8] iommu: Add PASID support to Arm SMMUv3 zhangfei
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