linux-kernel - Re: [PATCH V4 12/23] x86, ia64, pci: Remove ACPI companion device from platform specific data.

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Date:	Wed, 10 Feb 2016 22:21:15 +0100
From:	Tomasz Nowicki <tn@...ihalf.com>
To:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:	bhelgaas@...gle.com, arnd@...db.de, will.deacon@....com,
	catalin.marinas@....com, rjw@...ysocki.net, hanjun.guo@...aro.org,
	okaya@...eaurora.org, jiang.liu@...ux.intel.com,
	Stefano.Stabellini@...citrix.com,
	robert.richter@...iumnetworks.com, mw@...ihalf.com,
	Liviu.Dudau@....com, ddaney@...iumnetworks.com,
	wangyijing@...wei.com, Suravee.Suthikulpanit@....com,
	msalter@...hat.com, linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org,
	jchandra@...adcom.com, jcm@...hat.com
Subject: Re: [PATCH V4 12/23] x86, ia64, pci: Remove ACPI companion device
 from platform specific data.

On 02/09/2016 06:28 PM, Lorenzo Pieralisi wrote:
> This patch has to be squashed with the previous one otherwise it
> has bisectability issues (ie the previous patch passes the parent
> to the pci_create_root_bus() call so, without this patch applied,
> the companion initialization would fail).
I do not think so. The previous patch passes the parent to the 
pci_create_root_bus(), indeed, so pci_create_root_bus() set companion 
device before calling pcibios_root_bridge_prepare() (for both cases x86 
and ia64). In turn, pcibios_root_bridge_prepare() will do nothing, since 
bridge->dev.parent != NULL. After all, pcibios_root_bridge_prepare() is 
dead code.
>
> Other than that:
>
> Reviewed-by: Lorenzo Pieralisi<lorenzo.pieralisi@....com>
Thanks!

Tomasz