[Intel-gfx] [PATCH] drm/i915: Return -ENOENT for unknown contexts

[Mika Kuoppala]

From: Mika Kuoppala <mika.kuoppala at linux.intel.com>

If hw_contexts are disabled, we always return the per file
descriptor default context stats. Make sure that the context
is correctly given and fail accordingly if not.

Testcase: igt/gem_reset_stats/params
Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>
---
 drivers/gpu/drm/i915/i915_gem_context.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 30b355a..85c890c 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -582,8 +582,12 @@ i915_gem_context_get(struct drm_i915_file_private *file_priv, u32 id)
 {
 	struct i915_hw_context *ctx;
 
-	if (!HAS_HW_CONTEXTS(file_priv->dev_priv->dev))
+	if (!HAS_HW_CONTEXTS(file_priv->dev_priv->dev)) {
+		if (id != DEFAULT_CONTEXT_ID)
+			return ERR_PTR(-ENOENT);
+
 		return file_priv->private_default_ctx;
+	}
 
 	ctx = (struct i915_hw_context *)idr_find(&file_priv->context_idr, id);
 	if (!ctx)
-- 
1.7.9.5