linux-kernel - Re: [PATCH v3 5/9] pci: Split out pci

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Date:	Thu, 01 Aug 2013 16:59:14 -0400
From:	Don Dutile <ddutile@...hat.com>
To:	Alex Williamson <alex.williamson@...hat.com>
CC:	bhelgaas@...gle.com, linux-pci@...r.kernel.org,
	indou.takao@...fujitsu.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 5/9] pci: Split out pci_dev lock/unlock and save/restore

On 08/01/2013 12:55 PM, Alex Williamson wrote:
> Only cosmetic changes to existing paths.
>
> Signed-off-by: Alex Williamson<alex.williamson@...hat.com>
> ---
>   drivers/pci/pci.c |   52 +++++++++++++++++++++++++++++++++++-----------------
>   1 file changed, 35 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index db90692..f6c757a 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -3378,22 +3378,46 @@ done:
>   	return rc;
>   }
>
> +static void pci_dev_lock(struct pci_dev *dev)
> +{
> +	pci_cfg_access_lock(dev);
> +	/* block PM suspend, driver probe, etc. */
> +	device_lock(&dev->dev);
> +}
> +
> +static void pci_dev_unlock(struct pci_dev *dev)
> +{
> +	device_unlock(&dev->dev);
> +	pci_cfg_access_unlock(dev);
> +}
> +
> +static void pci_dev_save_and_disable(struct pci_dev *dev)
> +{
> +	pci_save_state(dev);
> +	/*
> +	 * both INTx and MSI are disabled after the Interrupt Disable bit
> +	 * is set and the Bus Master bit is cleared.
> +	 */
> +	pci_write_config_word(dev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
> +}
although the above is just a shuffling of the previous code,
does the comment need to point out that BARs are disabled by this write as well ?

> +
> +static void pci_dev_restore(struct pci_dev *dev)
> +{
> +	pci_restore_state(dev);
> +}
> +
>   static int pci_dev_reset(struct pci_dev *dev, int probe)
>   {
>   	int rc;
>
> -	if (!probe) {
> -		pci_cfg_access_lock(dev);
> -		/* block PM suspend, driver probe, etc. */
> -		device_lock(&dev->dev);
> -	}
> +	if (!probe)
> +		pci_dev_lock(dev);
>
>   	rc = __pci_dev_reset(dev, probe);
>
> -	if (!probe) {
> -		device_unlock(&dev->dev);
> -		pci_cfg_access_unlock(dev);
> -	}
> +	if (!probe)
> +		pci_dev_unlock(dev);
> +
>   	return rc;
>   }
>   /**
> @@ -3484,17 +3508,11 @@ int pci_reset_function(struct pci_dev *dev)
>   	if (rc)
>   		return rc;
>
> -	pci_save_state(dev);
> -
> -	/*
> -	 * both INTx and MSI are disabled after the Interrupt Disable bit
> -	 * is set and the Bus Master bit is cleared.
> -	 */
> -	pci_write_config_word(dev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
> +	pci_dev_save_and_disable(dev);
>
>   	rc = pci_dev_reset(dev, 0);
>
> -	pci_restore_state(dev);
> +	pci_dev_restore(dev);
>
>   	return rc;
>   }
>
> --
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