linux-kernel - Re: [PATCH AUTOSEL 6.14 382/642] PCI/pwrctrl: Move pci_pwrctrl_unregister() to pci_destroy

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Message-ID: <aBnDI_40fX7SM4tp@wunner.de>
Date: Tue, 6 May 2025 10:06:59 +0200
From: Lukas Wunner <lukas@...ner.de>
To: Sasha Levin <sashal@...nel.org>
Cc: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
	Krzysztof Wilczy??ski <kwilczynski@...nel.org>, bhelgaas@...gle.com,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 6.14 382/642] PCI/pwrctrl: Move
 pci_pwrctrl_unregister() to pci_destroy_dev()

On Mon, May 05, 2025 at 06:09:58PM -0400, Sasha Levin wrote:
> From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> 
> [ Upstream commit 2d923930f2e3fe1ecf060169f57980da819a191f ]
> 
> The PCI core will try to access the devices even after pci_stop_dev()
> for things like Data Object Exchange (DOE), ASPM, etc.
> 
> So, move pci_pwrctrl_unregister() to the near end of pci_destroy_dev()
> to make sure that the devices are powered down only after the PCI core
> is done with them.

The above was patch [2/5] in this series:

https://lore.kernel.org/r/20250116-pci-pwrctrl-slot-v3-0-827473c8fbf4@linaro.org/

... so I think the preceding patch [1/5] is a prerequisite and would
need to be cherry-picked as well.  Upstream commit id is:
957f40d039a98d630146f74f94b3f60a40a449e4

That said, I'm not sure this is really a fix that merits backporting
to stable.  Mani may have more comments whether it makes sense.

Thanks,

Lukas