linux-kernel - [PATCH 3.16 197/357] ACPI / platform / LPSS: disable async suspend/resume of LPSS devices

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Date:	Fri,  3 Oct 2014 14:29:43 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Li Aubrey <aubrey.li@...ux.intel.com>,
	Fu Zhonghui <zhonghui.fu@...ux.intel.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH 3.16 197/357] ACPI / platform / LPSS: disable async suspend/resume of LPSS devices

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Fu Zhonghui <zhonghui.fu@...ux.intel.com>

commit 457920817e645a7dee42c2a75c81c5ed8e12ee1c upstream.

On some systems (Asus T100 in particular) there are strict ordering
dependencies between LPSS devices with respect to power management
that break if they suspend/resume asynchronously.

In theory it should be possible to follow those dependencies in the
async suspend/resume case too (the ACPI tables tell as that the
dependencies are there), but since we're missing infrastructure
for that at the moment, disable async suspend/resume for all of
the LPSS devices for the time being.

Link: http://marc.info/?l=linux-acpi&m=141158962321905&w=2
Fixes: 8ce62f85a81f (ACPI / platform / LPSS: Enable async suspend/resume of LPSS devices)
Signed-off-by: Li Aubrey <aubrey.li@...ux.intel.com>
Signed-off-by: Fu Zhonghui <zhonghui.fu@...ux.intel.com>
[ rjw: Changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/acpi/acpi_lpss.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/acpi/acpi_lpss.c
+++ b/drivers/acpi/acpi_lpss.c
@@ -392,7 +392,6 @@ static int acpi_lpss_create_device(struc
 	adev->driver_data = pdata;
 	pdev = acpi_create_platform_device(adev);
 	if (!IS_ERR_OR_NULL(pdev)) {
-		device_enable_async_suspend(&pdev->dev);
 		return 1;
 	}

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