[Bug 283027] LinuxKPI PCI -- kernel panic: malloc(M_WAITOK) with sleeping prohibited

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283027

--- Comment #11 from commit-hook@FreeBSD.org ---
A commit in branch stable/15 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=d8972ad2f6e7113d779d4ec975ce32552030b2a3

commit d8972ad2f6e7113d779d4ec975ce32552030b2a3
Author:     Bjoern A. Zeeb <bz@FreeBSD.org>
AuthorDate: 2025-09-04 20:22:00 +0000
Commit:     Bjoern A. Zeeb <bz@FreeBSD.org>
CommitDate: 2025-09-30 21:45:28 +0000

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

    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 as the cleanup order of
    linux_pci_attach_device() needs correction seperately.

    Sponsored by:   The FreeBSD Foundation (initially)
    PR:             283027
    PR:             289647
    Suggested by:   jhb [1]
    Reviewed by:    dumbbell
    Differential Revision:  https://reviews.freebsd.org/D52069

    (cherry picked from commit bbeeb585315645db20118ef349a4e3dc83b148cc)
    (cherry picked from commit 3860afe99ec39b9942967941181f28f27f3fc548)
    (cherry picked from commit 123c2dc6e15a62ceba3469caf0f1a6801214a7d3)

 sys/compat/linuxkpi/common/src/linux_pci.c | 47 +++++++++++++++++++++++++-----
 1 file changed, 40 insertions(+), 7 deletions(-)

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