drm/nouveau: Check dsm on switcheroo unregister
Currently vga_switcheroo_unregister_handler is called unconditionally when
nouveau is unloaded, even when nouveau never registered a handler. This
interferes with other switcheroo handlers, as vga_switcheroo doesn't check who
called unregister_handler, but simply unregisters the current handler. This
patch adds a check so unregister is only called if a handler was registered by
nouveau before.
Signed-off-by: Andreas Heider <andreas@meetr.de>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_acpi.c b/drivers/gpu/drm/nouveau/nouveau_acpi.c
index 284bd25..fc841e8 100644
--- a/drivers/gpu/drm/nouveau/nouveau_acpi.c
+++ b/drivers/gpu/drm/nouveau/nouveau_acpi.c
@@ -338,7 +338,8 @@
void nouveau_unregister_dsm_handler(void)
{
- vga_switcheroo_unregister_handler();
+ if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
+ vga_switcheroo_unregister_handler();
}
/* retrieve the ROM in 4k blocks */