linux-kernel - Re: [PATCH v5 1/4] PCI/portdrv: Make use of pci_dev::bridge

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240806114808.GA2968@thinkpad>
Date: Tue, 6 Aug 2024 17:18:08 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Lukas Wunner <lukas@...ner.de>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>, Len Brown <lenb@...nel.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, mika.westerberg@...ux.intel.com,
	Hsin-Yi Wang <hsinyi@...omium.org>
Subject: Re: [PATCH v5 1/4] PCI/portdrv: Make use of pci_dev::bridge_d3 for
 checking the D3 possibility

On Tue, Aug 06, 2024 at 08:46:48AM +0200, Lukas Wunner wrote:
> On Mon, Aug 05, 2024 at 06:54:42PM +0530, Manivannan Sadhasivam wrote:
> > So what is wrong in using pci_dev::bridge_d3?
> 
> The bridge_d3 flag may change at runtime, e.g. when writing to the
> d3cold_allowed attribute in sysfs.
> 
> If e.g. bridge_d3 is set when pcie_portdrv_probe() runs but no longer
> set when pcie_portdrv_remove() runs, there would be a runtime PM ref
> imbalance.  (Ref would be dropped on probe, but not reacquired on remove.)
> 

Ah, so it is the other way around. Thanks for clearing it up!

- Mani

-- 
மணிவண்ணன் சதாசிவம்