Page MenuHomeFreeBSD

LinuxKPI: pci: allocate entire pci_dev hiereachy up to root port on attach
ClosedPublic

Authored by bz on Aug 21 2025, 8:59 AM.
Tags
None
Referenced Files
F132373643: D52069.id161631.diff
Thu, Oct 16, 8:23 AM
Unknown Object (File)
Sun, Oct 12, 5:40 AM
Unknown Object (File)
Fri, Oct 10, 9:56 PM
Unknown Object (File)
Fri, Oct 10, 9:56 PM
Unknown Object (File)
Fri, Oct 10, 9:56 PM
Unknown Object (File)
Fri, Oct 10, 4:04 PM
Unknown Object (File)
Thu, Oct 9, 12:12 AM
Unknown Object (File)
Mon, Oct 6, 8:22 AM
Subscribers

Details

Summary

In linux_pci_attach_device() allocate a LinuxKPI pci_dev for each device in
the hierarchy up to the root port[1] as we cannot do that later on demand
as we may be in a context where we may not sleep.

Take special care of DRM as there is a non-PCI device in the chain which
needs to be skipped.

iwlwifi(4) can hit this case called from a callout.

While here leave a comment sa the cleanup order of
linux_pci_attach_device() needs correction seperately.

Sponsored by: The FreeBSD Foundation
PR: 283027
Suggested by: jhb [1]
MFC after: 3 days

Diff Detail

Repository
rG FreeBSD src repository
Lint
Lint Not Applicable
Unit
Tests Not Applicable