Re: [PATCH AUTOSEL 6.18-5.15] ACPI: PCI: Clear _DEP dependencies after PCI root bridge attach

[sashiko-bot@kernel.org]

> From: Chen Pei <cp0613@linux.alibaba.com>
> 
> [ Upstream commit 3a59c3b772e5dc0cedecce8e7fbf7c2d6245b643 ]
> 
> PCI root bridges enumerated by acpi_pci_root_add() can be the _DEP
> supplier for other ACPI consumers, most notably ACPI0017 CXL root
> devices whose probe path depends on acpi_pci_find_root() succeeding.
> Once the root bus has been added, those consumers can safely be
> enumerated, so notify them by clearing the dependency.
> 
> Call acpi_dev_clear_dependencies() at the end of acpi_pci_root_add(),
> after pci_bus_add_devices(), following the same pattern used by other
> ACPI suppliers such as the EC (drivers/acpi/ec.c) and the ACPI PCI
> Link device (drivers/acpi/pci_link.c). The clear is intentionally
> done only on the success path; on the error paths the supplier did
> not attach and consumers must keep dep_unmet set.
> 
> This is a prerequisite for honoring _DEP on ACPI0016 host bridges,
> which matters on architectures where the probe order of acpi_pci_root
> relative to cxl_acpi is not guaranteed (e.g. RISC-V).
> 
> Signed-off-by: Chen Pei <cp0613@linux.alibaba.com>
> Suggested-by: Dan Williams (nvidia) <djbw@kernel.org>
> Tested-by: Alison Schofield <alison.schofield@intel.com>
> Reviewed-by: Alison Schofield <alison.schofield@intel.com>
> Link: https://patch.msgid.link/20260526025118.38935-2-cp0613@linux.alibaba.com
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> Signed-off-by: Sasha Levin <sashal@kernel.org>

Sashiko has reviewed this patch and found no issues. It looks great!

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