Re: [PATCH 0/3] PCI: host-generic: Fix driver_data overwriting bugs

[Marc Zyngier <maz@kernel.org>]

On Mon, 30 Jun 2025 18:06:01 +0100,
Bjorn Helgaas <helgaas@kernel.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.

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

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.