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/linux/drivers/gpu/drm/nouveau/
H A Dnouveau_acpi.cdiff cba97805cb69d5b1a1d3bb108872c73b5bf0e205 Fri Jul 15 15:12:17 CEST 2016 Peter Wu <peter@lekensteyn.nl> 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>