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f188056352
Remove the race where a hotplug of a device into an existing group will have the device installed in the group->devices, but not yet attached to the group's current domain. Move the group attachment logic from iommu_probe_device() and put it under the same mutex that updates the group->devices list so everything is atomic under the lock. We retain the two step setup of the default domain for the bus_iommu_probe() case solely so that we have a more complete view of the group when creating the default domain for boot time devices. This is not generally necessary with the current code structure but seems to be supporting some odd corner cases like alias RID's and IOMMU_RESV_DIRECT or driver bugs returning different default_domain types for the same group. During bus_iommu_probe() the group will have a device list but both group->default_domain and group->domain will be NULL. Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> Link: https://lore.kernel.org/r/10-v3-328044aa278c+45e49-iommu_probe_jgg@nvidia.com Signed-off-by: Joerg Roedel <jroedel@suse.de> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.