vga_switcheroo: Don't require handler init callback

This callback is a no-op in nouveau, and the upcoming apple-gmux
switcheroo support won't require it either. Rather than forcing drivers
to stub it out, just make it optional and remove the callback from
nouveau.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

2 files changed, 2 insertions, 7 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_acpi.c b/drivers/gpu/drm/nouveau/nouveau_acpi.c
index fc841e87b343..26ebffebe710 100644
--- a/drivers/gpu/drm/nouveau/nouveau_acpi.c
+++ b/drivers/gpu/drm/nouveau/nouveau_acpi.c
@@ -211,11 +211,6 @@ static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
         return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
 }
 
-static int nouveau_dsm_init(void)
-{
-        return 0;
-}
-
 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
 {
         /* easy option one - intel vendor ID means Integrated */
@@ -232,7 +227,6 @@ static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
 static struct vga_switcheroo_handler nouveau_dsm_handler = {
         .switchto = nouveau_dsm_switchto,
         .power_state = nouveau_dsm_power_state,
-        .init = nouveau_dsm_init,
         .get_client_id = nouveau_dsm_get_client_id,
 };
 
diff --git a/drivers/gpu/vga/vga_switcheroo.c b/drivers/gpu/vga/vga_switcheroo.c
index e10ba3755dfa..e25cf31faab2 100644
--- a/drivers/gpu/vga/vga_switcheroo.c
+++ b/drivers/gpu/vga/vga_switcheroo.c
@@ -83,7 +83,8 @@ static void vga_switcheroo_enable(void)
         struct vga_switcheroo_client *client;
 
         /* call the handler to init */
-        vgasr_priv.handler->init();
+        if (vgasr_priv.handler->init)
+                vgasr_priv.handler->init();
 
         list_for_each_entry(client, &vgasr_priv.clients, list) {
                 if (client->id != -1)