linux-kernel - Re: [RFC PATCH 03/11] PCI/MSI: Refactor pci_dev_msi

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Message-ID: <53E183A7.80905@huawei.com>
Date:	Wed, 6 Aug 2014 09:23:51 +0800
From:	Yijing Wang <wangyijing@...wei.com>
To:	Stuart Yoder <b08248@...il.com>
CC:	<linux-kernel@...r.kernel.org>, Xinwei Hu <huxinwei@...wei.com>,
	Wuyun <wuyun.wu@...wei.com>, Bjorn Helgaas <bhelgaas@...gle.com>,
	<linux-pci@...r.kernel.org>, <Paul.Mundt@...wei.com>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Marc Zyngier <marc.zyngier@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King <linux@....linux.org.uk>,
	<linux-arch@...r.kernel.org>, <arnab.basu@...escale.com>,
	<virtualization@...ts.linux-foundation.org>,
	Hanjun Guo <guohanjun@...wei.com>
Subject: Re: [RFC PATCH 03/11] PCI/MSI: Refactor pci_dev_msi_enabled()

On 2014/8/6 6:35, Stuart Yoder wrote:
> On Fri, Jul 25, 2014 at 10:08 PM, Yijing Wang <wangyijing@...wei.com> wrote:
>> Pci_dev_msi_enabled() is used to check whether device
>> MSI/MSIX enabled. Refactor this function  to suuport
>> checking only device MSI or MSIX enabled.
>>
>> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
> 
> So this patch refactors things so that checks like this:
>    > -       if (!dev->msi_enabled)
> 
> are moved into a function:
>    > +       if (!pci_dev_msi_enabled(dev, MSI_TYPE))
> 
> Can you explain a bit more why this  needed.   Is it just cleanup?

Hi Stuart, it's not just cleanup, because "[RFC PATCH 08/11] PCI/MSI: Introduce new struct msi_irqs and struct msi_ops"
introduced struct msi_irqs, so the code will change to
if (!dev->msi_irqs->msi_enabled)

I think driver should not need to know the details of MSI members.
So I try to rework the pci_dev_msi_enabled() to hide the detailed MSI info.


Thanks!
Yijing.


> 
> .
> 


-- 
Thanks!
Yijing

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