linux-kernel - Re: [GIT PULL] PCI changes for v5.1

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Date:   Sun, 17 Mar 2019 14:18:35 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Alexandru Gagniuc <mr.nuke.me@...il.com>,
        Lukas Wunner <lukas@...ner.de>
Cc:     linux-pci@...r.kernel.org,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [GIT PULL] PCI changes for v5.1

On Fri, Mar 8, 2019 at 9:31 AM Bjorn Helgaas <helgaas@...nel.org> wrote:
>
>   - Report PCIe links that become degraded at run-time (Alexandru Gagniuc)

Gaah. Only now as I'm about to do the rc1 release am I looking at new
runtime warnings, and noticing that this causes

  genirq: Threaded irq requested with handler=NULL and !ONESHOT for irq 16
  pcie_bw_notification: probe of 0000:00:1b.0:pcie010 failed with error -22

because you can't have a NULL handler for a level-triggered interrupt
(you need something to shut the interrupt off so that it doesn't keep
screaming!).

Happens on both my desktop and my laptop, regular intel CPU and
chipset, nothing odd in either case.

Everything else works, but the new BW notification obviously will
never work this way.

This is not holding up rc1, obviously, but I thought I'd mention it
since I noticed it as part of my "let's see that nothing regressed"
checks..

                    Linus