linux-kernel - Re: [PATCH 3/3] ata: update ata port's runtime status during system resume

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Date:	Thu, 15 Dec 2011 02:45:01 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Jeff Garzik <jgarzik@...ox.com>,
	James Bottomley <JBottomley@...allels.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH 3/3] ata: update ata port's runtime status during system resume

On Wed, Dec 14, 2011 at 11:18 AM, Lin Ming <ming.m.lin@...el.com> wrote:
> The ata port is brought back to full power state during system resume.
> So its runtime PM status will have to be updated to reflect
> the actual post-system sleep status.
>
> This also fixes below warning during system suspend/resume.
>
> WARNING: at /work/linux/drivers/ata/libata-eh.c:4034
> ata_scsi_port_error_handler+0x89/0x557()
>
> 4034         WARN_ON(!(ap->pflags & ATA_PFLAG_SUSPENDED));
>
> Signed-off-by: Lin Ming <ming.m.lin@...el.com>

Hi Alan,

Would you like to Ack this one also?

Thanks,
Lin Ming

> ---
>  drivers/ata/libata-core.c |   18 ++++++++++++++++--
>  1 files changed, 16 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
> index 15a3d4d..8996758 100644
> --- a/drivers/ata/libata-core.c
> +++ b/drivers/ata/libata-core.c
> @@ -5298,7 +5298,7 @@ static int ata_port_suspend(struct device *dev)
>        return ata_port_suspend_common(dev);
>  }
>
> -static int ata_port_resume(struct device *dev)
> +static int ata_port_resume_common(struct device *dev)
>  {
>        struct ata_port *ap = to_ata_port(dev);
>        int rc;
> @@ -5308,6 +5308,20 @@ static int ata_port_resume(struct device *dev)
>        return rc;
>  }
>
> +static int ata_port_resume(struct device *dev)
> +{
> +       int rc;
> +
> +       rc = ata_port_resume_common(dev);
> +       if (!rc) {
> +               pm_runtime_disable(dev);
> +               pm_runtime_set_active(dev);
> +               pm_runtime_enable(dev);
> +       }
> +
> +       return rc;
> +}
> +
>  static int ata_port_runtime_idle(struct device *dev)
>  {
>        return pm_runtime_suspend(dev);
> @@ -5318,7 +5332,7 @@ static const struct dev_pm_ops ata_port_pm_ops = {
>        .resume = ata_port_resume,
>
>        .runtime_suspend = ata_port_suspend_common,
> -       .runtime_resume = ata_port_resume,
> +       .runtime_resume = ata_port_resume_common,
>        .runtime_idle = ata_port_runtime_idle,
>  };
>
> --
> 1.7.2.5
>
> --
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