linux-kernel - Re: [PATCH 0/3] PCI: host-generic: Fix driver

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Message-ID: <20250630173415.GA1787642@bhelgaas>
Date: Mon, 30 Jun 2025 12:34:15 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Marc Zyngier <maz@...nel.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
	Alyssa Rosenzweig <alyssa@...enzweig.io>,
	Rob Herring <robh@...nel.org>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Janne Grunau <j@...nau.net>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] PCI: host-generic: Fix driver_data overwriting bugs

On Mon, Jun 30, 2025 at 06:23:00PM +0100, Marc Zyngier wrote:
> On Mon, 30 Jun 2025 18:06:01 +0100,
> Bjorn Helgaas <helgaas@...nel.org> wrote:
> > 
> > On Wed, Jun 25, 2025 at 12:18:03PM +0100, Marc Zyngier wrote:
> > > Geert reports that some drivers do rely on the device driver_data
> > > field containing a pointer to the bridge structure at the point of
> > > initialising the root port, while this has been recently changed to
> > > contain some other data for the benefit of the Apple PCIe driver.
> > > 
> > > This small series builds on top of Geert previously posted (and
> > > included as a prefix for reference) fix for the Microchip driver,
> > > which breaks the Apple driver. This is basically swapping a regression
> > > for another, which isn't a massive deal at this stage, as the
> > > follow-up patch fixes things for the Apple driver by adding extra
> > > tracking.
> > 
> > Is there a bisection hole between patches 1 and 2?
> > 
> >   1: PCI: host-generic: Set driver_data before calling gen_pci_init()
> >   2: PCI: apple: Add tracking of probed root ports
> > 
> > If so, would it be practical to avoid the hole by reordering those
> > patches?
> 
> Sure, but you said you already had queued patch #1, and what is in
> -rc1 already breaks Geert's box. So no matter the order, we break
> something at some point.

I did, but when I saw your problem report and subsequent updates, I
put Geert's patch on hold.

> If you want to only break one thing, then yes, swapping these two
> patches is the correct thing to do.

I swapped them and put them back on pci/for-linus for v6.16:

  https://git.kernel.org/cgit/linux/kernel/git/pci/pci.git/log/?h=for-linus&id=ba74278c638d