linux-kernel - Re: [GIT PULL] Driver core changes for 6.0-rc1

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Date:   Wed, 14 Sep 2022 09:24:39 -0700
From:   Olof Johansson <olof@...om.net>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Saravana Kannan <saravanak@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>
Subject: Re: [GIT PULL] Driver core changes for 6.0-rc1

Hi,

On Wed, Sep 14, 2022 at 7:00 AM Greg KH <gregkh@...uxfoundation.org> wrote:
>
> On Tue, Sep 13, 2022 at 09:28:27AM -0700, Olof Johansson wrote:
> > On Tue, Sep 13, 2022 at 8:15 AM Greg KH <gregkh@...uxfoundation.org> wrote:
> > >
> > > On Mon, Sep 12, 2022 at 10:24:43AM -0700, Olof Johansson wrote:
> > > > On Mon, Sep 12, 2022 at 10:23 AM Olof Johansson <olof@...om.net> wrote:
> > > > >
> > > > > Hi,
> > > > >
> > > > > On Wed, Aug 3, 2022 at 7:16 AM Greg KH <gregkh@...uxfoundation.org> wrote:
> > > > >
> > > > > > Saravana Kannan (11):
> > > > > >       PM: domains: Delete usage of driver_deferred_probe_check_state()
> > > > > >       pinctrl: devicetree: Delete usage of driver_deferred_probe_check_state()
> > > > > >       net: mdio: Delete usage of driver_deferred_probe_check_state()
> > > > > >       driver core: Add wait_for_init_devices_probe helper function
> > > > > >       net: ipconfig: Relax fw_devlink if we need to mount a network rootfs
> > > > > >       Revert "driver core: Set default deferred_probe_timeout back to 0."
> > > > > >       driver core: Set fw_devlink.strict=1 by default
> > > > > >       iommu/of: Delete usage of driver_deferred_probe_check_state()
> > > > > >       driver core: Delete driver_deferred_probe_check_state()
> > > > > >       driver core: fw_devlink: Allow firmware to mark devices as best effort
> > > > > >       of: base: Avoid console probe delay when fw_devlink.strict=1
> > > > >
> > > > > The last patch in this list regresses my HoneyComb LX2K (ironically
> > > > > the machine I do maintainer work on). It stops PCIe from probing, but
> > > > > without a single message indicating why.
> > > > >
> > > > > The reason seems to be that the iommu-maps property doesn't get
> > > > > patched up by my (older) u-boot, and thus isn't a valid reference.
> > > > > System works fine without IOMMU, which is how I've ran it for a couple
> > > > > of years.
> > > > >
> > > > > It's also extremely hard to diagnose out of the box because there are
> > > > > *no error messages*. And there were no warnings leading up to this
> > > > > strict enforcement.
> > > > >
> > > > > This "feature" seems to have been done backwards. The checks should
> > > > > have been running (and not skipped due to the "optional" flag), but
> > > > > also not causing errors, just warnings. That would have given users a
> > > > > chance to know that this is something that needs to be fixed.
> > > > >
> > > > > And when you flip the switch, at least report what failed so that
> > > > > people don't need to spend a whole night bisecting kernels, please.
> > > > >
> > > > > Greg, mind reverting just the last one? If I hit this, I presume
> > > > > others would too.
> > > >
> > > > Apologies, wrong patch pointed out. The culprit is "driver core: Set
> > > > fw_devlink.strict=1 by default", 71066545b48e42.
> > >
> > > Is this still an issue in -rc5?  A number of patches in the above series
> > > was just reverted and hopefully should have resolved the issue you are
> > > seeing.
> >
> > Unfortunately, I discovered this regression with -rc5 in the first
> > place, so it's still there.
>
> Ick, ok, Saravana, any thoughts?  I know you're at the conference this
> week with me, maybe you can give Olof a hint as to what to look for
> here?

I'm not sure what you want me to look for. The patch turns on
enforcement of DT contents that never used to be enforced, so now my
computer no longer boots. And it does it in a way that makes it
impossible for someone not rebuilding kernels to debug to figure out
what happened.

The patch needs to be reverted.


-Olof