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[ Upstream commit7b38fd9760] Except for Endpoints, we enable PTM at enumeration-time. Previously we did not account for the fact that Switch Downstream Ports are not permitted to have a PTM capability; their PTM behavior is controlled by the Upstream Port (PCIe r5.0, sec 7.9.16). Since Downstream Ports don't have a PTM capability, we did not mark them as "ptm_enabled", which meant that pci_enable_ptm() on an Endpoint failed because there was no PTM path to it. Mark Downstream Ports as "ptm_enabled" if their Upstream Port has PTM enabled. Fixes:eec097d431("PCI: Add pci_enable_ptm() for drivers to enable PTM on endpoints") Reported-by: Aditya Paluri <Venkata.AdityaPaluri@synopsys.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.