drm/i915: convert to idr_alloc()

Convert to the much saner new idr interface.
Signed-off-by: NTejun Heo <tj@kernel.org>
Acked-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: NDavid Airlie <airlied@linux.ie>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/gpu/drm/i915/i915_gem_context.c

@@ -139,7 +139,7 @@ create_hw_context(struct drm_device *dev,
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct i915_hw_context *ctx;
-	int ret, id;
+	int ret;
 
 	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 	if (ctx == NULL)
@@ -164,22 +164,11 @@ create_hw_context(struct drm_device *dev,
 
 	ctx->file_priv = file_priv;
 
-again:
-	if (idr_pre_get(&file_priv->context_idr, GFP_KERNEL) == 0) {
-		ret = -ENOMEM;
-		DRM_DEBUG_DRIVER("idr allocation failed\n");
-		goto err_out;
-	}
-
-	ret = idr_get_new_above(&file_priv->context_idr, ctx,
-				DEFAULT_CONTEXT_ID + 1, &id);
-	if (ret == 0)
-		ctx->id = id;
-
-	if (ret == -EAGAIN)
-		goto again;
-	else if (ret)
+	ret = idr_alloc(&file_priv->context_idr, ctx, DEFAULT_CONTEXT_ID + 1, 0,
+			GFP_KERNEL);
+	if (ret < 0)
 		goto err_out;
+	ctx->id = ret;
 
 	return ctx;