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

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Message-ID: <20231017071014.GA4592@wunner.de>
Date:   Tue, 17 Oct 2023 09:10:14 +0200
From:   Lukas Wunner <lukas@...ner.de>
To:     Ricky WU <ricky_wu@...ltek.com>
Cc:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        Tony Luck <tony.luck@...el.com>,
        "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI: pciehp: Prevent child devices from doing RPM on
 PCIe Link Down

[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@...onical.com>
> > On Mon, Oct 16, 2023 at 5:32???PM Lukas Wunner <lukas@...ner.de> 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