Re: [PATCH] PCI: pciehp: Prevent child devices from doing RPM on PCIe Link Down

[Lukas Wunner]

[cc -= unrelated mailing lists bpf, kernel-hardening]

On Tue, Oct 17, 2023 at 05:44:13AM +0000, Ricky WU wrote:
> > From: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
> > On Mon, Oct 16, 2023 at 5:32???PM Lukas Wunner <lukas@xxxxxxxxx> wrote:
> > > On Mon, Oct 16, 2023 at 12:01:31PM +0800, Kai-Heng Feng wrote:
> > > > When inserting an SD7.0 card to Realtek card reader, it can trigger
> > > > PCI slot Link down and causes the following error:
> > >
> > > Why does *inserting* a card cause a Link Down?
> > 
> > Ricky, do you know the reason why Link Down happens?
> 
> Because SD7.0 card is use pcie-nvme driver, reader need to re-link
> then just do the pcie channel

I don't quite follow.  I don't see a pcie-nvme driver in Linus'
current master branch.  Which driver are you referring to?

What does "re-link" mean?  Rebind to a different driver?

Thanks,

Lukas