linux-kernel - Re: [PATCH 4/5] scsi: pm: use runtime resume callback if available

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Date:	Mon, 23 Jul 2012 18:36:12 +0400
From:	Sergei Shtylyov <sshtylyov@...sta.com>
To:	Aaron Lu <aaron.lu@....com>
CC:	Jeff Garzik <jgarzik@...ox.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Lin Ming <minggr@...il.com>, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-ide@...r.kernel.org, Aaron Lu <aaron.lwe@...il.com>
Subject: Re: [PATCH 4/5] scsi: pm: use runtime resume callback if available

Hello.

On 07/23/2012 10:49 AM, Aaron Lu wrote:

> When runtime resume a scsi device, if the device's driver has
> implemented runtime resume callback, use that instead of the resume
> callback.

> sr driver needs this to properly do different things for system resume
> and runtime resume.

> Signed-off-by: Aaron Lu <aaron.lu@....com>
> ---
>  drivers/scsi/scsi_pm.c | 14 +++++++++-----
>  drivers/scsi/sr.c      | 21 +++++++++++++++++++++
>  2 files changed, 30 insertions(+), 5 deletions(-)

> diff --git a/drivers/scsi/scsi_pm.c b/drivers/scsi/scsi_pm.c
> index d4201de..19bba47 100644
> --- a/drivers/scsi/scsi_pm.c
> +++ b/drivers/scsi/scsi_pm.c
> @@ -34,14 +34,18 @@ static int scsi_dev_type_suspend(struct device *dev, pm_message_t msg)
>  	return err;
>  }
>  
> -static int scsi_dev_type_resume(struct device *dev)
> +static int scsi_dev_type_resume(struct device *dev, bool runtime)
>  {
>  	struct device_driver *drv;
>  	int err = 0;
> +	int (*resume)(struct device *);
>  
>  	drv = dev->driver;
> -	if (drv && drv->resume)
> -		err = drv->resume(dev);
> +	if (runtime && drv && drv->pm && drv->pm->runtime_resume)
> +		resume = drv->pm->runtime_resume;
> +	else
> +		resume = drv ? drv->resume : NULL;

   Call thru NULL pointer below will cause kernel oops. Is it your intention?

> +	err = resume(dev);

WBR, Sergei

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