linux-kernel - Re: [RFC/RFT][PATCH 4/5] ACPI / LPSS: Support for device latency tolerance PM QoS

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Message-ID: <20140120111518.GE18029@intel.com>
Date:	Mon, 20 Jan 2014 13:15:19 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Linux PM list <linux-pm@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC/RFT][PATCH 4/5] ACPI / LPSS: Support for device latency
 tolerance PM QoS

On Fri, Jan 17, 2014 at 03:46:40PM +0100, Rafael J. Wysocki wrote:
> @@ -415,11 +472,12 @@ static int acpi_lpss_platform_notify(str
>  		return 0;
>  	}
>  
> -	if (action == BUS_NOTIFY_ADD_DEVICE)
> +	if (action == BUS_NOTIFY_ADD_DEVICE) {
>  		ret = sysfs_create_group(&pdev->dev.kobj, &lpss_attr_group);
> -	else if (action == BUS_NOTIFY_DEL_DEVICE)
> +		pdev->dev.power.set_latency_tolerance = acpi_lpss_set_ltr;

While trying to test this I noticed that BUS_NOTIFY_ADD_DEVICE happens
after call to dpm_sysfs_add(), so LTR field is never exposed to the
userspace.

> +	} else if (action == BUS_NOTIFY_DEL_DEVICE) {
>  		sysfs_remove_group(&pdev->dev.kobj, &lpss_attr_group);
> -
> +	}
>  	return ret;
>  }
>  
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