drm/i915: Prevent dereference of engine before NULL check in error capture

smatch caught,
drivers/gpu/drm/i915/i915_gpu_error.c:1418 gem_record_rings() warn: variable dereferenced before check 'engine' (see line 1413)

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190621135246.20683-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-06-21 14:52:46 +01:00
parent db56f97494
commit 5f6730a468

View File

@ -1410,7 +1410,6 @@ static void gem_record_rings(struct i915_gpu_state *error)
for (i = 0; i < I915_NUM_ENGINES; i++) {
struct intel_engine_cs *engine = i915->engine[i];
struct drm_i915_error_engine *ee = &error->engine[i];
struct i915_ggtt *ggtt = engine->gt->ggtt;
struct i915_request *request;
ee->engine_id = -1;
@ -1428,7 +1427,7 @@ static void gem_record_rings(struct i915_gpu_state *error)
struct i915_gem_context *ctx = request->gem_context;
struct intel_ring *ring;
ee->vm = ctx->vm ?: &ggtt->vm;
ee->vm = ctx->vm ?: &engine->gt->ggtt->vm;
record_context(&ee->context, ctx);