From: Jiang Liu <jiang.liu@linux.intel.com>
Date: Thu, 20 Feb 2014 09:23:16 +0000 (+0800)
Subject: ACPI / nouveau: fix probing regression related to _DSM
X-Git-Tag: v3.14-rc4~17^2~2^4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e284175a96e5af087ea7806b3e38282b524ff5b9;p=pandora-kernel.git

ACPI / nouveau: fix probing regression related to _DSM

Fix regression caused by commit b072e53, which breaks loading nouveau
driver on optimus laptops.

On some platforms, ACPI _DSM method (nouveau_op_dsm_muid, function 0)
has special requirements on the fourth parameter, which is different
from ACPI specifications. So revert to the private implementation
to check availability of _DSM functions instead of using common
acpi_check_dsm() interface.

Fixes: b072e53b0a27 (ACPI / nouveau: replace open-coded _DSM code with helper functions)
Reported-and-tested-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
[rjw: Subject]
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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