From d57b7f02d2e525e5600e5d77370d7ad2b4c9b265 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kristian=20H=C3=B8gsberg?= <krh@redhat.com>
Date: Tue, 3 Jul 2007 10:41:48 -0400
Subject: Use idr_replace trick to eliminate struct drm_ctx_sarea_list.

---
 linux-core/drmP.h         |  4 ----
 linux-core/drm_context.c  | 41 +++++++----------------------------------
 linux-core/drm_drawable.c |  3 +--
 3 files changed, 8 insertions(+), 40 deletions(-)

diff --git a/linux-core/drmP.h b/linux-core/drmP.h
index 7bcd095a..c992c8d9 100644
--- a/linux-core/drmP.h
+++ b/linux-core/drmP.h
@@ -570,10 +570,6 @@ typedef struct drm_ctx_list {
 	drm_file_t *tag;		/**< associated fd private data */
 } drm_ctx_list_t;
 
-struct drm_ctx_sarea_list {
-	drm_map_t *map;
-};
-
 typedef struct drm_vbl_sig {
 	struct list_head head;
 	unsigned int sequence;
diff --git a/linux-core/drm_context.c b/linux-core/drm_context.c
index ff08e809..195c7fb5 100644
--- a/linux-core/drm_context.c
+++ b/linux-core/drm_context.c
@@ -58,17 +58,9 @@
  */
 void drm_ctxbitmap_free(drm_device_t * dev, int ctx_handle)
 {
-	struct drm_ctx_sarea_list *ctx;
-
 	mutex_lock(&dev->struct_mutex);
-	ctx = idr_find(&dev->ctx_idr, ctx_handle);
-	if (ctx) {
-		idr_remove(&dev->ctx_idr, ctx_handle);
-		drm_free(ctx, sizeof(struct drm_ctx_sarea_list), DRM_MEM_CTXLIST);
-	} else
-		DRM_ERROR("Attempt to free invalid context handle: %d\n", ctx_handle);
+	idr_remove(&dev->ctx_idr, ctx_handle);
 	mutex_unlock(&dev->struct_mutex);
-	return;
 }
 
 /**
@@ -84,20 +76,15 @@ static int drm_ctxbitmap_next(drm_device_t * dev)
 {
 	int new_id;
 	int ret;
-	struct drm_ctx_sarea_list *new_ctx;
-
-	new_ctx = drm_calloc(1, sizeof(struct drm_ctx_sarea_list), DRM_MEM_CTXLIST);
-	if (!new_ctx)
-		return -1;
 
 again:
 	if (idr_pre_get(&dev->ctx_idr, GFP_KERNEL) == 0) {
 		DRM_ERROR("Out of memory expanding drawable idr\n");
-		drm_free(new_ctx, sizeof(struct drm_ctx_sarea_list), DRM_MEM_CTXLIST);
 		return -ENOMEM;
 	}
 	mutex_lock(&dev->struct_mutex);
-	ret = idr_get_new_above(&dev->ctx_idr, new_ctx, DRM_RESERVED_CONTEXTS, &new_id);
+	ret = idr_get_new_above(&dev->ctx_idr, NULL,
+				DRM_RESERVED_CONTEXTS, &new_id);
 	if (ret == -EAGAIN) {
 		mutex_unlock(&dev->struct_mutex);
 		goto again;
@@ -120,15 +107,6 @@ int drm_ctxbitmap_init(drm_device_t * dev)
 	return 0;
 }
 
-
-
-static int drm_ctx_sarea_free(int id, void *p, void *data)
-{
-	struct drm_ctx_sarea_list *ctx_entry = p;
-	drm_free(ctx_entry, sizeof(struct drm_ctx_sarea_list), DRM_MEM_CTXLIST);
-	return 0;
-}
-
 /**
  * Context bitmap cleanup.
  *
@@ -140,7 +118,6 @@ static int drm_ctx_sarea_free(int id, void *p, void *data)
 void drm_ctxbitmap_cleanup(drm_device_t * dev)
 {
 	mutex_lock(&dev->struct_mutex);
-	idr_for_each(&dev->ctx_idr, drm_ctx_sarea_free, NULL);
 	idr_remove_all(&dev->ctx_idr);
 	mutex_unlock(&dev->struct_mutex);
 }
@@ -172,19 +149,17 @@ int drm_getsareactx(struct inode *inode, struct file *filp,
 	drm_ctx_priv_map_t request;
 	drm_map_t *map;
 	drm_map_list_t *_entry;
-	struct drm_ctx_sarea_list *ctx_sarea;
 
 	if (copy_from_user(&request, argp, sizeof(request)))
 		return -EFAULT;
 
 	mutex_lock(&dev->struct_mutex);
 
-	ctx_sarea = idr_find(&dev->ctx_idr, request.ctx_id);
-	if (!ctx_sarea) {
+	map = idr_find(&dev->ctx_idr, request.ctx_id);
+	if (!map) {
 		mutex_unlock(&dev->struct_mutex);
 		return -EINVAL;
 	}
-	map = ctx_sarea->map;
 
 	mutex_unlock(&dev->struct_mutex);
 
@@ -224,7 +199,6 @@ int drm_setsareactx(struct inode *inode, struct file *filp,
 	drm_ctx_priv_map_t request;
 	drm_map_t *map = NULL;
 	drm_map_list_t *r_list = NULL;
-	struct drm_ctx_sarea_list *ctx_sarea;
 
 	if (copy_from_user(&request,
 			   (drm_ctx_priv_map_t __user *) arg, sizeof(request)))
@@ -245,12 +219,11 @@ int drm_setsareactx(struct inode *inode, struct file *filp,
 	if (!map)
 		goto bad;
 
-	ctx_sarea = idr_find(&dev->ctx_idr, request.ctx_id);
-	if (!ctx_sarea)
+	if (IS_ERR(idr_replace(&dev->ctx_idr, map, request.ctx_id)))
 		goto bad;
 
-	ctx_sarea->map = map;
 	mutex_unlock(&dev->struct_mutex);
+
 	return 0;
 }
 
diff --git a/linux-core/drm_drawable.c b/linux-core/drm_drawable.c
index 57b62ca4..7129980b 100644
--- a/linux-core/drm_drawable.c
+++ b/linux-core/drm_drawable.c
@@ -113,8 +113,7 @@ int drm_update_drawable_info(DRM_IOCTL_ARGS)
 		info = drm_calloc(1, sizeof(*info), DRM_MEM_BUFS);
 		if (!info)
 			return -ENOMEM;
-		if (idr_replace(&dev->drw_idr, info, update.handle) ==
-		    (void*)-ENOENT) {
+		if (IS_ERR(idr_replace(&dev->drw_idr, info, update.handle))) {
 			DRM_ERROR("No such drawable %d\n", update.handle);
 			drm_free(info, sizeof(*info), DRM_MEM_BUFS);
 			return -EINVAL;
-- 
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