@@ -599,7 +599,7 @@ int iommu_group_add_device(struct iommu_group *group, struct device *dev)
if (group->domain)
ret = __iommu_attach_device(group->domain, dev);
mutex_unlock(&group->mutex);
- if (ret)
+ if (ret && ret != -ENOTSUPP)
goto err_put_group;
/* Notify any listeners about change to group. */
@@ -625,7 +625,8 @@ int iommu_group_add_device(struct iommu_group *group, struct device *dev)
sysfs_remove_link(&dev->kobj, "iommu_group");
err_free_device:
kfree(device);
- pr_err("Failed to add device %s to group %d: %d\n", dev_name(dev), group->id, ret);
+ if (ret != -ENOTSUPP)
+ pr_err("Failed to add device %s to group %d: %d\n", dev_name(dev), group->id, ret);
return ret;
}
EXPORT_SYMBOL_GPL(iommu_group_add_device);
@@ -1238,8 +1239,16 @@ struct iommu_group *iommu_group_get_for_dev(struct device *dev)
ret = iommu_group_add_device(group, dev);
if (ret) {
- iommu_group_put(group);
- return ERR_PTR(ret);
+ /*
+ * If the driver chooses not to bind the device, reset
+ * group->domain so a new domain can be added later
+ */
+ if (ret == -ENOTSUPP)
+ group->domain = NULL;
+ else {
+ iommu_group_put(group);
+ return ERR_PTR(ret);
+ }
}
return group;
Provide individual device drivers the chance to gracefully refuse to attach a device to the default domain. If the attach_device op returns -ENOTSUPP don't print a error message and don't set group->domain but still return success from iommu_group_add_dev(). This allows all the usual APIs to work and the next domain to try to attach will take group->domain for itself and everything will proceed as normal. Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org> --- drivers/iommu/iommu.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-)