PCI: Initialize RCB from pci_configure_device()

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[ Upstream commit 1a6845aaa6 ]

Commit e42010d820 ("PCI: Set Read Completion Boundary to 128 iff Root
Port supports it (_HPX)") worked around a bogus _HPX type 2 record, which
caused program_hpx_type2() to set the RCB in an endpoint even though the
Root Port did not have the RCB bit set.

e42010d820 fixed that by setting the RCB in the endpoint only when it was
set in the Root Port.

In retrospect, program_hpx_type2() is intended for AER-related settings,
and the RCB should be configured elsewhere so it doesn't depend on the
presence or contents of an _HPX record.

Explicitly program the RCB from pci_configure_device() so it matches the
Root Port's RCB.  The Root Port may not be visible to virtualized guests;
in that case, leave RCB alone.

Fixes: e42010d820 ("PCI: Set Read Completion Boundary to 128 iff Root Port supports it (_HPX)")
Signed-off-by: Håkon Bugge <haakon.bugge@oracle.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20260129175237.727059-2-haakon.bugge@oracle.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Håkon Bugge 2026-01-29 18:52:32 +01:00 • committed by Greg Kroah-Hartman

parent da289440f0

commit dbe723b480

1 changed files with 32 additions and 0 deletions

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drivers/pci/probe.c

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