linux-kernel - Re: [PATCH 7/9] PCI: use pdev->pm_cap instead of pci_find_capability(..,PCI_CAP_ID

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Message-ID: <1678257.RBpxK26BQQ@vostro.rjw.lan>
Date:	Tue, 18 Jun 2013 15:44 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Yijing Wang <wangyijing@...wei.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, Hanjun Guo <guohanjun@...wei.com>,
	jiang.liu@...wei.com
Subject: Re: [PATCH 7/9] PCI: use pdev->pm_cap instead of pci_find_capability(..,PCI_CAP_ID_PM)

On Tuesday, June 18, 2013 04:22:14 PM Yijing Wang wrote:
> Pci pm cap register offset has been saved in pci_pm_init(),
> so we can use pdev->pm_cap instead of using pci_find_capability(..)
> here.
> 
> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
> Cc: linux-pci@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

> ---
>  drivers/pci/pci.c    |    2 +-
>  drivers/pci/quirks.c |    6 ++----
>  2 files changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index a899d8b..1117f2c 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -805,7 +805,7 @@ pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state)
>  {
>  	pci_power_t ret;
>  
> -	if (!pci_find_capability(dev, PCI_CAP_ID_PM))
> +	if (!dev->pm_cap)
>  		return PCI_D0;
>  
>  	ret = platform_pci_choose_state(dev);
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index 7d68aee..422812b 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -1832,7 +1832,6 @@ static void quirk_e100_interrupt(struct pci_dev *dev)
>  	u16 command, pmcsr;
>  	u8 __iomem *csr;
>  	u8 cmd_hi;
> -	int pm;
>  
>  	switch (dev->device) {
>  	/* PCI IDs taken from drivers/net/e100.c */
> @@ -1870,9 +1869,8 @@ static void quirk_e100_interrupt(struct pci_dev *dev)
>  	 * Check that the device is in the D0 power state. If it's not,
>  	 * there is no point to look any further.
>  	 */
> -	pm = pci_find_capability(dev, PCI_CAP_ID_PM);
> -	if (pm) {
> -		pci_read_config_word(dev, pm + PCI_PM_CTRL, &pmcsr);
> +	if (dev->pm_cap) {
> +		pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
>  		if ((pmcsr & PCI_PM_CTRL_STATE_MASK) != PCI_D0)
>  			return;
>  	}
> 
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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