linux-kernel - Re: [PATCH v2] ASPM: Use msleep instead of cpu

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Date:	Mon, 05 Jan 2009 16:54:36 -0800
From:	Joe Perches <joe@...ches.com>
To:	Andrew Patterson <andrew.patterson@...com>
Cc:	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	matthew@....cx, akpm@...ux-foundation.org, shaohua.li@...el.com
Subject: Re: [PATCH v2] ASPM: Use msleep instead of cpu_relax during link
 retraining

On Mon, 2009-01-05 at 16:07 -0700, Andrew Patterson wrote:
> ASPM: Use msleep instead of cpu_relax during link retraining
> Signed-off-by: Andrew Patterson <andrew.patterson@...com>
> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
> index 4d8e2c7..e67eaa2 100644
> --- a/drivers/pci/pcie/aspm.c
> +++ b/drivers/pci/pcie/aspm.c
[]
> @@ -238,16 +241,19 @@ static void pcie_aspm_configure_common_clock(struct pci_dev *pdev)
>  	pci_write_config_word(pdev, pos + PCI_EXP_LNKCTL, reg16);
>  
>  	/* Wait for link training end */
> -	/* break out after waiting for 1 second */
> +	/* break out after waiting for timeout */
>  	start_jiffies = jiffies;
> -	while ((jiffies - start_jiffies) < HZ) {
> +	for (;;) {
>  		pci_read_config_word(pdev, pos + PCI_EXP_LNKSTA, &reg16);
>  		if (!(reg16 & PCI_EXP_LNKSTA_LT))
>  			break;
> -		cpu_relax();
> +		if (time_after(start_jiffies,
> +			       start_jiffies + LINK_RETRAIN_TIMEOUT))
> +			break;
> +		msleep(1);
>  	}

if (time_after(jiffies, start_jiffies + LINK_RETRAIN_TIMEOUT))


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