[Intel-gfx] [PATCH] drm/i915: Change context lifecycle

[kbuild test robot]

Hi Nick,

[auto build test WARNING on drm-intel/for-linux-next]
[also build test WARNING on v4.4-rc2 next-20151124]

url:    https://github.com/0day-ci/linux/commits/Nick-Hoath/drm-i915-Change-context-lifecycle/20151125-002840
base:   git://anongit.freedesktop.org/drm-intel for-linux-next
config: x86_64-randconfig-x019-11241713 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   drivers/gpu/drm/i915/intel_lrc.c: In function 'intel_lr_context_free':
>> drivers/gpu/drm/i915/intel_lrc.c:2404:6: warning: ignoring return value of 'i915_wait_request', declared with attribute warn_unused_result [-Wunused-result]
         i915_wait_request(req);
         ^
   drivers/gpu/drm/i915/intel_lrc.c: In function 'intel_logical_ring_begin':
   drivers/gpu/drm/i915/intel_lrc.c:711:17: warning: 'space' may be used uninitialized in this function [-Wmaybe-uninitialized]
     ringbuf->space = space;
                    ^
   drivers/gpu/drm/i915/intel_lrc.c:679:11: note: 'space' was declared here
     unsigned space;
              ^

vim +/i915_wait_request +2404 drivers/gpu/drm/i915/intel_lrc.c

  2388						ctx->engine[i].ringbuf;
  2389				struct intel_engine_cs *ring = ringbuf->ring;
  2390	
  2391				if (ctx == ring->default_context) {
  2392					intel_unpin_ringbuffer_obj(ringbuf);
  2393					i915_gem_object_ggtt_unpin(ctx_obj);
  2394				}
  2395	
  2396				if (ctx->engine[ring->id].unsaved) {
  2397					int ret;
  2398					struct drm_i915_gem_request *req;
  2399	
  2400					ret = i915_gem_request_alloc(ring,
  2401						ring->default_context, &req);
  2402					if (!ret) {
  2403						i915_add_request(req);
> 2404						i915_wait_request(req);
  2405					}
  2406				}
  2407	
  2408				WARN_ON(ctx->engine[i].pin_count);
  2409				intel_ringbuffer_free(ringbuf);
  2410				drm_gem_object_unreference(&ctx_obj->base);
  2411			}
  2412		}

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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