tree e39848026859b29a45924f831f0eba547ca9267a
parent a12e78dd3e727094e449ee4e3b752ea9b6f8db01
author Peter Wu <peter@lekensteyn.nl> 1468588337 +0200
committer Ben Skeggs <bskeggs@redhat.com> 1469866785 +1000

drm/nouveau/acpi: check for function 0x1B before using it

Do not unconditionally invoke function 0x1B without checking for its
availability, it leads to an infinite loop on some firmware.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=104791
Fixes: 5addcf0a5f0fad ("nouveau: add runtime PM support (v0.9)")
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Peter Wu <peter@lekensteyn.nl>
Acked-by: Dave Airlie <airlied@redhat.com
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>