linux-kernel - Re: [PATCH 2/3] ACPI / PM: Make messages in acpi_device_set

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Date:	Mon, 29 Jul 2013 11:06:36 +0800
From:	Lan Tianyu <lantianyu1986@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Aaron Lu <aaron.lu@...el.com>, Tejun Heo <tj@...nel.org>,
	linux-ide@...r.kernel.org
Subject: Re: [PATCH 2/3] ACPI / PM: Make messages in acpi_device_set_power()
 print device names

2013/7/27 Rafael J. Wysocki <rjw@...k.pl>:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> Modify acpi_device_set_power() so that diagnostic messages printed by
> it to the kernel log always contain the name of the device concerned
> to make it possible to identify the device that triggered the message
> if need be.
>
> Also replace printk(KERN_WARNING ) with dev_warn() everywhere in that
> function.
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
>  drivers/acpi/device_pm.c |   22 ++++++++++------------
>  1 file changed, 10 insertions(+), 12 deletions(-)
>
> Index: linux-pm/drivers/acpi/device_pm.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/device_pm.c
> +++ linux-pm/drivers/acpi/device_pm.c
> @@ -166,20 +166,20 @@ int acpi_device_set_power(struct acpi_de
>         /* Make sure this is a valid target state */
>
>         if (state == device->power.state) {
> -               ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
> +               ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already in %s\n",
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
Missing "is" or it should be omitted?

> +                                 device->pnp.bus_id,
>                                   acpi_power_state_string(state)));
>                 return 0;
>         }
>
>         if (!device->power.states[state].flags.valid) {
> -               printk(KERN_WARNING PREFIX "Device does not support %s\n",
> -                      acpi_power_state_string(state));
> +               dev_warn(&device->dev, "Power state %s not supported\n",
> +                        acpi_power_state_string(state));
>                 return -ENODEV;
>         }
>         if (device->parent && (state < device->parent->power.state)) {
> -               printk(KERN_WARNING PREFIX
> -                             "Cannot set device to a higher-powered"
> -                             " state than parent\n");
> +               dev_warn(&device->dev, "Cannot transition to a higher-powered "
> +                        "state than parent\n");
>                 return -ENODEV;
>         }
>
> @@ -192,8 +192,8 @@ int acpi_device_set_power(struct acpi_de
>
>         if (state < device->power.state && state != ACPI_STATE_D0
>             && device->power.state >= ACPI_STATE_D3_HOT) {
> -               printk(KERN_WARNING PREFIX
> -                       "Cannot transition to non-D0 state from D3\n");
> +               dev_warn(&device->dev,
> +                        "Cannot transition to non-D0 state from D3\n");
>                 return -ENODEV;
>         }
>
> @@ -220,10 +220,8 @@ int acpi_device_set_power(struct acpi_de
>
>   end:
>         if (result) {
> -               printk(KERN_WARNING PREFIX
> -                             "Device [%s] failed to transition to %s\n",
> -                             device->pnp.bus_id,
> -                             acpi_power_state_string(state));
> +               dev_warn(&device->dev, "Failed to change power state to %s\n",
> +                        acpi_power_state_string(state));
>         } else {
>                 device->power.state = state;
>                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
>
> --
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-- 
Best regards
Tianyu Lan
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