linux-kernel - Re: [PATCH 3/3] driver: Add Legacy PM OPS usage check and warning to driver

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Message-ID: <1868309.7dxduFC77U@vostro.rjw.lan>
Date:	Tue, 24 Dec 2013 01:51:27 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Shuah Khan <shuah.kh@...sung.com>
Cc:	gregkh@...uxfoundation.org, shuahkhan@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] driver: Add Legacy PM OPS usage check and warning to driver_register()

On Thursday, November 07, 2013 05:03:50 PM Shuah Khan wrote:
> Add Legacy PM OPS usage checks to driver_register() function. If Legacy PM OPS
> usage is found, print warning message to indicate the driver code needs
> updating to use Dev PM OPS interfaces. This will help serve as a way to track
> drivers that still use Legacy PM OPS and fix them.
> 
> The Legacy PM OPS check looks for suspend(struct device *, pm_message_t) or
> resume(struct device *) struct device_driver interfaces.
> 
> Signed-off-by: Shuah Khan <shuah.kh@...sung.com>
> ---
>  drivers/base/driver.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/base/driver.c b/drivers/base/driver.c
> index 9e29943..10ff280 100644
> --- a/drivers/base/driver.c
> +++ b/drivers/base/driver.c
> @@ -157,6 +157,10 @@ int driver_register(struct device_driver *drv)
>  		printk(KERN_WARNING "Driver '%s' needs updating - please use "
>  			"bus_type methods\n", drv->name);
>  
> +	if (drv->suspend || drv->resume)
> +		pr_warn("Please update driver '%s' to use dev pm ops.\n",
> +			drv->name);

What about the following message instead:

		pr_warn("Driver '%s' needs updating - please use the pm pointer.\n",
			drv->name);

And analogously for bus types and classes?

> +
>  	other = driver_find(drv->name, drv->bus);
>  	if (other) {
>  		printk(KERN_ERR "Error: Driver '%s' is already registered, "
> 

Thanks!

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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