Re: [PATCH v5 1/4] PCI/portdrv: Make use of pci_dev::bridge_d3 for checking the D3 possibility

[Manivannan Sadhasivam]

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

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