drm/i915: linuxify create_hw_context()

Daniel complained about this on initial review, but he graciously moved
the patches forward. As promised, I am delivering the desired cleanup
now.

Hopefully I didn't screw the trivial patch up ;-)

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 24 insertions, 26 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index e58e8366f47..9ae3f2cf414 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -136,37 +136,36 @@ static void do_destroy(struct i915_hw_context *ctx)
         kfree(ctx);
 }
 
-static int
+static struct i915_hw_context *
 create_hw_context(struct drm_device *dev,
-                  struct drm_i915_file_private *file_priv,
-                  struct i915_hw_context **ctx_out)
+                  struct drm_i915_file_private *file_priv)
 {
         struct drm_i915_private *dev_priv = dev->dev_private;
+        struct i915_hw_context *ctx;
         int ret, id;
 
-        *ctx_out = kzalloc(sizeof(struct drm_i915_file_private), GFP_KERNEL);
-        if (*ctx_out == NULL)
-                return -ENOMEM;
+        ctx = kzalloc(sizeof(struct drm_i915_file_private), GFP_KERNEL);
+        if (ctx == NULL)
+                return ERR_PTR(-ENOMEM);
 
-        (*ctx_out)->obj = i915_gem_alloc_object(dev,
-                                                dev_priv->hw_context_size);
-        if ((*ctx_out)->obj == NULL) {
-                kfree(*ctx_out);
+        ctx->obj = i915_gem_alloc_object(dev, dev_priv->hw_context_size);
+        if (ctx->obj == NULL) {
+                kfree(ctx);
                 DRM_DEBUG_DRIVER("Context object allocated failed\n");
-                return -ENOMEM;
+                return ERR_PTR(-ENOMEM);
         }
 
         /* The ring associated with the context object is handled by the normal
          * object tracking code. We give an initial ring value simple to pass an
          * assertion in the context switch code.
          */
-        (*ctx_out)->ring = &dev_priv->ring[RCS];
+        ctx->ring = &dev_priv->ring[RCS];
 
         /* Default context will never have a file_priv */
         if (file_priv == NULL)
-                return 0;
+                return ctx;
 
-        (*ctx_out)->file_priv = file_priv;
+        ctx->file_priv = file_priv;
 
 again:
         if (idr_pre_get(&file_priv->context_idr, GFP_KERNEL) == 0) {
@@ -175,21 +174,21 @@ again:
                 goto err_out;
         }
 
-        ret = idr_get_new_above(&file_priv->context_idr, *ctx_out,
+        ret = idr_get_new_above(&file_priv->context_idr, ctx,
                                 DEFAULT_CONTEXT_ID + 1, &id);
         if (ret == 0)
-                (*ctx_out)->id = id;
+                ctx->id = id;
 
         if (ret == -EAGAIN)
                 goto again;
         else if (ret)
                 goto err_out;
 
-        return 0;
+        return ctx;
 
 err_out:
-        do_destroy(*ctx_out);
-        return ret;
+        do_destroy(ctx);
+        return ERR_PTR(ret);
 }
 
 static inline bool is_default_context(struct i915_hw_context *ctx)
@@ -209,10 +208,9 @@ static int create_default_context(struct drm_i915_private *dev_priv)
 
         BUG_ON(!mutex_is_locked(&dev_priv->dev->struct_mutex));
 
-        ret = create_hw_context(dev_priv->dev, NULL,
-                                &dev_priv->ring[RCS].default_context);
-        if (ret)
-                return ret;
+        ctx = create_hw_context(dev_priv->dev, NULL);
+        if (IS_ERR(ctx))
+                return PTR_ERR(ctx);
 
         /* We may need to do things with the shrinker which require us to
          * immediately switch back to the default context. This can cause a
@@ -220,7 +218,7 @@ static int create_default_context(struct drm_i915_private *dev_priv)
          * may not be available. To avoid this we always pin the
          * default context.
          */
-        ctx = dev_priv->ring[RCS].default_context;
+        dev_priv->ring[RCS].default_context = ctx;
         ret = i915_gem_object_pin(ctx->obj, CONTEXT_ALIGN, false);
         if (ret) {
                 do_destroy(ctx);
@@ -496,13 +494,13 @@ int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
         if (ret)
                 return ret;
 
-        ret = create_hw_context(dev, file_priv, &ctx);
+        ctx = create_hw_context(dev, file_priv);
         mutex_unlock(&dev->struct_mutex);
 
         args->ctx_id = ctx->id;
         DRM_DEBUG_DRIVER("HW context %d created\n", args->ctx_id);
 
-        return ret;
+        return PTR_RET(ctx);
 }
 
 int i915_gem_context_destroy_ioctl(struct drm_device *dev, void *data,