linux-kernel - Re: [PATCH v2 23/30] PCI/mvebu: Use pci_common_init

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Message-ID: <20150122184000.63ba06bb@free-electrons.com>
Date:	Thu, 22 Jan 2015 18:40:00 +0100
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Yijing Wang <wangyijing@...wei.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	<linux-pci@...r.kernel.org>, Yinghai Lu <yinghai@...nel.org>,
	<linux-kernel@...r.kernel.org>,
	Marc Zyngier <marc.zyngier@....com>,
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King <linux@....linux.org.uk>, <x86@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Tony Luck <tony.luck@...el.com>, <linux-ia64@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	"Guan Xuetao" <gxt@...c.pku.edu.cn>, <linux-alpha@...r.kernel.org>,
	<linux-m68k@...ts.linux-m68k.org>, Liviu Dudau <liviu@...au.co.uk>,
	"Arnd Bergmann" <arnd@...db.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Jason Cooper <jason@...edaemon.net>,
	Gregory Clément 
	<gregory.clement@...e-electrons.com>,
	Lior Amsalem <alior@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>
Subject: Re: [PATCH v2 23/30] PCI/mvebu: Use pci_common_init_dev() to
 simplify code

Dear Yijing Wang,

On Wed, 21 Jan 2015 08:30:18 +0800, Yijing Wang wrote:
> Mvebu_pcie_scan_bus() is not necessary, we could use
> pci_common_init_dev() instead of pci_common_init(),
> and pass the device pointer as the parent. Then
> pci_scan_root_bus() will be called to scan the pci busses.
> 
> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
> CC: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
> CC: Jason Cooper <jason@...edaemon.net>

While I'm fine with the change to pci_common_init_dev(), I am not so
sure about the removal of mvebu_pcie_scan_bus(). I vaguely remember
that we intentionally did not use the default function for a specific
reason. Of course, this was a long time ago, and I don't remember the
reason. I would have to take a bit of time to 1/ review the archives of
the discussion surrounding the pcie-mvebu driver, and 2/ test your
patch to validate it works fine on HW.

Thanks!

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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