linux-kernel - Re: [PATCH v2 03/22] MSI: Remove the redundant irq_set_chip

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Message-ID: <20140926080949.GF31106@ulmo>
Date:	Fri, 26 Sep 2014 10:09:49 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Yijing Wang <wangyijing@...wei.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, Xinwei Hu <huxinwei@...wei.com>,
	Wuyun <wuyun.wu@...wei.com>,
	linux-arm-kernel@...ts.infradead.org,
	Russell King <linux@....linux.org.uk>,
	linux-arch@...r.kernel.org, arnab.basu@...escale.com,
	Bharat.Bhushan@...escale.com, x86@...nel.org,
	Arnd Bergmann <arnd@...db.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	xen-devel@...ts.xenproject.org, Joerg Roedel <joro@...tes.org>,
	iommu@...ts.linux-foundation.org, linux-mips@...ux-mips.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	Tony Luck <tony.luck@...el.com>, linux-ia64@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	sparclinux@...r.kernel.org, Chris Metcalf <cmetcalf@...era.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Lucas Stach <l.stach@...gutronix.de>,
	David Vrabel <david.vrabel@...rix.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Subject: Re: [PATCH v2 03/22] MSI: Remove the redundant irq_set_chip_data()

On Thu, Sep 25, 2014 at 11:14:13AM +0800, Yijing Wang wrote:
> Currently, pcie-designware, pcie-rcar, pci-tegra drivers
> use irq chip_data to save the msi_chip pointer. They
> already call irq_set_chip_data() in their own MSI irq map
> functions. So irq_set_chip_data() in arch_setup_msi_irq()
> is useless.
> 
> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
> ---
>  drivers/pci/msi.c |    5 ++---
>  1 files changed, 2 insertions(+), 3 deletions(-)

Reviewed-by: Thierry Reding <treding@...dia.com>

> 
> diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
> index 51d7e62..50f67a3 100644
> --- a/drivers/pci/msi.c
> +++ b/drivers/pci/msi.c
> @@ -41,14 +41,13 @@ int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
>  	if (err < 0)
>  		return err;
>  
> -	irq_set_chip_data(desc->irq, chip);
> -
>  	return 0;
>  }
>  
>  void __weak arch_teardown_msi_irq(unsigned int irq)
>  {
> -	struct msi_chip *chip = irq_get_chip_data(irq);
> +	struct msi_desc *entry = irq_get_msi_desc(irq);
> +	struct msi_chip *chip = entry->dev->bus->msi;
>  
>  	if (!chip || !chip->teardown_irq)
>  		return;
> -- 
> 1.7.1
> 

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