drm/i915: Add a default case in gen7 hwsp switch-case

Gen7 won't get any new engines, and we already added VCS2 there to just
silence gcc's not handled in switch warnings.

Use a default case instead, otherwise we will need to keep adding extra
cases if changes happen in the future.

v2: Since reaching the default case is impossible, use GEM_BUG_ON (Chris).

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Michel Thierry <michel.thierry@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170830180115.907-1-michel.thierry@intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 6 insertions, 5 deletions

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index cdf084ef5aae..268342433a8e 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -402,17 +402,18 @@ static void intel_ring_setup_status_page(struct intel_engine_cs *engine)
          */
         if (IS_GEN7(dev_priv)) {
                 switch (engine->id) {
+                /*
+                 * No more rings exist on Gen7. Default case is only to shut up
+                 * gcc switch check warning.
+                 */
+                default:
+                        GEM_BUG_ON(engine->id);
                 case RCS:
                         mmio = RENDER_HWS_PGA_GEN7;
                         break;
                 case BCS:
                         mmio = BLT_HWS_PGA_GEN7;
                         break;
-                /*
-                 * VCS2 actually doesn't exist on Gen7. Only shut up
-                 * gcc switch check warning
-                 */
-                case VCS2:
                 case VCS:
                         mmio = BSD_HWS_PGA_GEN7;
                         break;