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Jason Gunthorpe 61e9081748 vfio/pci: Move VGA and VF initialization to functions
vfio_pci_probe() is quite complicated, with optional VF and VGA sub
components. Move these into clear init/uninit functions and have a linear
flow in probe/remove.

This fixes a few little buglets:
 - vfio_pci_remove() is in the wrong order, vga_client_register() removes
   a notifier and is after kfree(vdev), but the notifier refers to vdev,
   so it can use after free in a race.
 - vga_client_register() can fail but was ignored

Organize things so destruction order is the reverse of creation order.

Fixes: ecaa1f6a01 ("vfio-pci: Add VGA arbiter client")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Message-Id: <7-v3-225de1400dfc+4e074-vfio1_jgg@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
History 2021-04-06 11:55:10 -06:00
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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.