From 14891af3799e8cd24dee14f78c31fa663cfb5ba9 Mon Sep 17 00:00:00 2001 From: Jason Gunthorpe Date: Mon, 5 Jun 2023 21:59:44 -0300 Subject: [PATCH] iommu: Move the iommu driver sysfs setup into iommu_init/deinit_device() It makes logical sense that once the driver is attached to the device the sysfs links appear, even if we haven't fully created the group_device or attached the device to a domain. Fix the missing error handling on sysfs creation since iommu_init_device() can trivially handle this. Reviewed-by: Kevin Tian Reviewed-by: Lu Baolu Signed-off-by: Jason Gunthorpe Link: https://lore.kernel.org/r/6-v3-328044aa278c+45e49-iommu_probe_jgg@nvidia.com Signed-off-by: Joerg Roedel --- drivers/iommu/iommu-sysfs.c | 6 ------ drivers/iommu/iommu.c | 13 +++++++++---- 2 files changed, 9 insertions(+), 10 deletions(-) diff --git a/drivers/iommu/iommu-sysfs.c b/drivers/iommu/iommu-sysfs.c index 99869217fbec..c8aba0e2a30d 100644 --- a/drivers/iommu/iommu-sysfs.c +++ b/drivers/iommu/iommu-sysfs.c @@ -107,9 +107,6 @@ int iommu_device_link(struct iommu_device *iommu, struct device *link) { int ret; - if (!iommu || IS_ERR(iommu)) - return -ENODEV; - ret = sysfs_add_link_to_group(&iommu->dev->kobj, "devices", &link->kobj, dev_name(link)); if (ret) @@ -126,9 +123,6 @@ EXPORT_SYMBOL_GPL(iommu_device_link); void iommu_device_unlink(struct iommu_device *iommu, struct device *link) { - if (!iommu || IS_ERR(iommu)) - return; - sysfs_remove_link(&link->kobj, "iommu"); sysfs_remove_link_from_group(&iommu->dev->kobj, "devices", dev_name(link)); } diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index f052f52958fd..4688f61b7a4f 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -356,12 +356,16 @@ static int iommu_init_device(struct device *dev, const struct iommu_ops *ops) goto err_module_put; } + ret = iommu_device_link(iommu_dev, dev); + if (ret) + goto err_release; + group = ops->device_group(dev); if (WARN_ON_ONCE(group == NULL)) group = ERR_PTR(-EINVAL); if (IS_ERR(group)) { ret = PTR_ERR(group); - goto err_release; + goto err_unlink; } dev->iommu_group = group; @@ -371,6 +375,8 @@ static int iommu_init_device(struct device *dev, const struct iommu_ops *ops) dev->iommu->attach_deferred = ops->is_attach_deferred(dev); return 0; +err_unlink: + iommu_device_unlink(iommu_dev, dev); err_release: if (ops->release_device) ops->release_device(dev); @@ -388,6 +394,8 @@ static void iommu_deinit_device(struct device *dev) lockdep_assert_held(&group->mutex); + iommu_device_unlink(dev->iommu->iommu_dev, dev); + /* * release_device() must stop using any attached domain on the device. * If there are still other devices in the group they are not effected @@ -462,7 +470,6 @@ static int __iommu_probe_device(struct device *dev, struct list_head *group_list iommu_group_put(group); mutex_unlock(&iommu_probe_device_lock); - iommu_device_link(dev->iommu->iommu_dev, dev); return 0; @@ -584,8 +591,6 @@ static void iommu_release_device(struct device *dev) if (!dev->iommu || !group) return; - iommu_device_unlink(dev->iommu->iommu_dev, dev); - __iommu_group_remove_device(dev); }