drm: cleanup use of Linux list handling macros

This makes the drms use of the list handling macros a lot cleaner
and more along the lines of how they should be used and uses them
in some more places.
Signed-off-by: NDave Airlie <airlied@linux.ie>

drivers/char/drm/drmP.h

@@ -279,20 +279,15 @@ typedef struct drm_devstate {
 } drm_devstate_t;
 
 typedef struct drm_magic_entry {
-	drm_hash_item_t hash_item;
 	struct list_head head;
+	drm_hash_item_t hash_item;
 	struct drm_file *priv;
 	struct drm_magic_entry *next;
 } drm_magic_entry_t;
 
-typedef struct drm_magic_head {
-	struct drm_magic_entry *head;
-	struct drm_magic_entry *tail;
-} drm_magic_head_t;
-
 typedef struct drm_vma_entry {
+	struct list_head head;
 	struct vm_area_struct *vma;
-	struct drm_vma_entry *next;
 	pid_t pid;
 } drm_vma_entry_t;
 
@@ -379,8 +374,7 @@ typedef struct drm_file {
 	uid_t uid;
 	drm_magic_t magic;
 	unsigned long ioctl_count;
-	struct drm_file *next;
-	struct drm_file *prev;
+	struct list_head lhead;
 	struct drm_head *head;
 	int remove_auth_on_close;
 	unsigned long lock_count;
@@ -449,8 +443,7 @@ typedef struct drm_agp_mem {
 	DRM_AGP_MEM *memory;
 	unsigned long bound;		/**< address */
 	int pages;
-	struct drm_agp_mem *prev;	/**< previous entry */
-	struct drm_agp_mem *next;	/**< next entry */
+	struct list_head head;
 } drm_agp_mem_t;
 
 /**
@@ -460,7 +453,7 @@ typedef struct drm_agp_mem {
  */
 typedef struct drm_agp_head {
 	DRM_AGP_KERN agp_info;		/**< AGP device information */
-	drm_agp_mem_t *memory;		/**< memory entries */
+	struct list_head memory;
 	unsigned long mode;		/**< AGP mode */
 	struct agp_bridge_data *bridge;
 	int enabled;			/**< whether the AGP bus as been enabled */
@@ -669,28 +662,27 @@ typedef struct drm_device {
 
 	/** \name Authentication */
 	/*@{ */
-	drm_file_t *file_first;		/**< file list head */
-	drm_file_t *file_last;		/**< file list tail */
+	struct list_head filelist;
 	drm_open_hash_t magiclist;	/**< magic hash table */
 	struct list_head magicfree;
 	/*@} */
 
 	/** \name Memory management */
 	/*@{ */
-	drm_map_list_t *maplist;	/**< Linked list of regions */
+	struct list_head maplist;	/**< Linked list of regions */
 	int map_count;			/**< Number of mappable regions */
 	drm_open_hash_t map_hash;	/**< User token hash table for maps */
 
 	/** \name Context handle management */
 	/*@{ */
-	drm_ctx_list_t *ctxlist;	/**< Linked list of context handles */
+	struct list_head ctxlist;	/**< Linked list of context handles */
 	int ctx_count;			/**< Number of context handles */
 	struct mutex ctxlist_mutex;	/**< For ctxlist */
 
 	drm_map_t **context_sareas;	    /**< per-context SAREA's */
 	int max_context;
 
-	drm_vma_entry_t *vmalist;	/**< List of vmas (for debugging) */
+	struct list_head vmalist;	/**< List of vmas (for debugging) */
 	drm_lock_data_t lock;		/**< Information on hardware lock */
 	/*@} */
 
@@ -725,8 +717,8 @@ typedef struct drm_device {
 	atomic_t vbl_received;
 	atomic_t vbl_received2;		/**< number of secondary VBLANK interrupts */
 	spinlock_t vbl_lock;
-	drm_vbl_sig_t vbl_sigs;		/**< signal list to send on VBLANK */
-	drm_vbl_sig_t vbl_sigs2;	/**< signals to send on secondary VBLANK */
+	struct list_head vbl_sigs;		/**< signal list to send on VBLANK */
+	struct list_head vbl_sigs2;	/**< signals to send on secondary VBLANK */
 	unsigned int vbl_pending;
 	spinlock_t tasklet_lock;	/**< For drm_locked_tasklet */
 	void (*locked_tasklet_func)(struct drm_device *dev);
@@ -1089,7 +1081,7 @@ static __inline__ struct drm_map *drm_core_findmap(struct drm_device *dev,
 						   unsigned int token)
 {
 	drm_map_list_t *_entry;
-	list_for_each_entry(_entry, &dev->maplist->head, head)
+	list_for_each_entry(_entry, &dev->maplist, head)
 	    if (_entry->user_token == token)
 		return _entry->map;
 	return NULL;

drivers/char/drm/drm_agpsupport.c

@@ -232,11 +232,7 @@ int drm_agp_alloc(drm_device_t *dev, drm_agp_buffer_t *request)
 	entry->memory = memory;
 	entry->bound = 0;
 	entry->pages = pages;
-	entry->prev = NULL;
-	entry->next = dev->agp->memory;
-	if (dev->agp->memory)
-		dev->agp->memory->prev = entry;
-	dev->agp->memory = entry;
+	list_add(&entry->head, &dev->agp->memory);
 
 	request->handle = entry->handle;
 	request->physical = memory->physical;
@@ -262,10 +258,12 @@ int drm_agp_alloc_ioctl(struct inode *inode, struct file *filp,
 		return err;
 
 	if (copy_to_user(argp, &request, sizeof(request))) {
-		drm_agp_mem_t *entry = dev->agp->memory;
-
-		dev->agp->memory = entry->next;
-		dev->agp->memory->prev = NULL;
+		drm_agp_mem_t *entry;
+		list_for_each_entry(entry, &dev->agp->memory, head) {
+			if (entry->handle == request.handle)
+				break;
+		}
+		list_del(&entry->head);
 		drm_free_agp(entry->memory, entry->pages);
 		drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
 		return -EFAULT;
@@ -288,7 +286,7 @@ static drm_agp_mem_t *drm_agp_lookup_entry(drm_device_t * dev,
 {
 	drm_agp_mem_t *entry;
 
-	for (entry = dev->agp->memory; entry; entry = entry->next) {
+	list_for_each_entry(entry, &dev->agp->memory, head) {
 		if (entry->handle == handle)
 			return entry;
 	}
@@ -413,13 +411,7 @@ int drm_agp_free(drm_device_t *dev, drm_agp_buffer_t *request)
 	if (entry->bound)
 		drm_unbind_agp(entry->memory);
 
-	if (entry->prev)
-		entry->prev->next = entry->next;
-	else
-		dev->agp->memory = entry->next;
-
-	if (entry->next)
-		entry->next->prev = entry->prev;
+	list_del(&entry->head);
 
 	drm_free_agp(entry->memory, entry->pages);
 	drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
@@ -472,7 +464,7 @@ drm_agp_head_t *drm_agp_init(drm_device_t * dev)
 		drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
 		return NULL;
 	}
-	head->memory = NULL;
+	INIT_LIST_HEAD(&head->memory);
 	head->cant_use_aperture = head->agp_info.cant_use_aperture;
 	head->page_mask = head->agp_info.page_mask;
 

drivers/char/drm/drm_bufs.c

@@ -52,10 +52,8 @@ EXPORT_SYMBOL(drm_get_resource_len);
 static drm_map_list_t *drm_find_matching_map(drm_device_t *dev,
 					     drm_local_map_t *map)
 {
-	struct list_head *list;
-
-	list_for_each(list, &dev->maplist->head) {
-		drm_map_list_t *entry = list_entry(list, drm_map_list_t, head);
+	drm_map_list_t *entry;
+	list_for_each_entry(entry, &dev->maplist, head) {
 		if (entry->map && map->type == entry->map->type &&
 		    ((entry->map->offset == map->offset) ||
 		     (map->type == _DRM_SHM && map->flags==_DRM_CONTAINS_LOCK))) {
@@ -237,14 +235,14 @@ static int drm_addmap_core(drm_device_t * dev, unsigned int offset,
 		 * skipped and we double check that dev->agp->memory is
 		 * actually set as well as being invalid before EPERM'ing
 		 */
-		for (entry = dev->agp->memory; entry; entry = entry->next) {
+		list_for_each_entry(entry, &dev->agp->memory, head) {
 			if ((map->offset >= entry->bound) &&
 			    (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
 				valid = 1;
 				break;
 			}
 		}
-		if (dev->agp->memory && !valid) {
+		if (!list_empty(&dev->agp->memory) && !valid) {
 			drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 			return -EPERM;
 		}
@@ -289,7 +287,7 @@ static int drm_addmap_core(drm_device_t * dev, unsigned int offset,
 	list->map = map;
 
 	mutex_lock(&dev->struct_mutex);
-	list_add(&list->head, &dev->maplist->head);
+	list_add(&list->head, &dev->maplist);
 
 	/* Assign a 32-bit handle */
 	/* We do it here so that dev->struct_mutex protects the increment */
@@ -380,29 +378,24 @@ int drm_addmap_ioctl(struct inode *inode, struct file *filp,
  */
 int drm_rmmap_locked(drm_device_t *dev, drm_local_map_t *map)
 {
-	struct list_head *list;
-	drm_map_list_t *r_list = NULL;
+	drm_map_list_t *r_list = NULL, *list_t;
 	drm_dma_handle_t dmah;
+	int found = 0;
 
 	/* Find the list entry for the map and remove it */
-	list_for_each(list, &dev->maplist->head) {
-		r_list = list_entry(list, drm_map_list_t, head);
-
+	list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 		if (r_list->map == map) {
-			list_del(list);
+			list_del(&r_list->head);
 			drm_ht_remove_key(&dev->map_hash,
 					  r_list->user_token >> PAGE_SHIFT);
-			drm_free(list, sizeof(*list), DRM_MEM_MAPS);
+			drm_free(r_list, sizeof(*r_list), DRM_MEM_MAPS);
+			found = 1;
 			break;
 		}
 	}
 
-	/* List has wrapped around to the head pointer, or it's empty and we
-	 * didn't find anything.
-	 */
-	if (list == (&dev->maplist->head)) {
+	if (!found)
 		return -EINVAL;
-	}
 
 	switch (map->type) {
 	case _DRM_REGISTERS:
@@ -460,7 +453,7 @@ int drm_rmmap_ioctl(struct inode *inode, struct file *filp,
 	drm_device_t *dev = priv->head->dev;
 	drm_map_t request;
 	drm_local_map_t *map = NULL;
-	struct list_head *list;
+	drm_map_list_t *r_list;
 	int ret;
 
 	if (copy_from_user(&request, (drm_map_t __user *) arg, sizeof(request))) {
@@ -468,9 +461,7 @@ int drm_rmmap_ioctl(struct inode *inode, struct file *filp,
 	}
 
 	mutex_lock(&dev->struct_mutex);
-	list_for_each(list, &dev->maplist->head) {
-		drm_map_list_t *r_list = list_entry(list, drm_map_list_t, head);
-
+	list_for_each_entry(r_list, &dev->maplist, head) {
 		if (r_list->map &&
 		    r_list->user_token == (unsigned long)request.handle &&
 		    r_list->map->flags & _DRM_REMOVABLE) {
@@ -482,7 +473,7 @@ int drm_rmmap_ioctl(struct inode *inode, struct file *filp,
 	/* List has wrapped around to the head pointer, or its empty we didn't
 	 * find anything.
 	 */
-	if (list == (&dev->maplist->head)) {
+	if (list_empty(&dev->maplist) || !map) {
 		mutex_unlock(&dev->struct_mutex);
 		return -EINVAL;
 	}
@@ -606,14 +597,14 @@ int drm_addbufs_agp(drm_device_t * dev, drm_buf_desc_t * request)
 
 	/* Make sure buffers are located in AGP memory that we own */
 	valid = 0;
-	for (agp_entry = dev->agp->memory; agp_entry; agp_entry = agp_entry->next) {
+	list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 		if ((agp_offset >= agp_entry->bound) &&
 		    (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 			valid = 1;
 			break;
 		}
 	}
-	if (dev->agp->memory && !valid) {
+	if (!list_empty(&dev->agp->memory) && !valid) {
 		DRM_DEBUG("zone invalid\n");
 		return -EINVAL;
 	}

drivers/char/drm/drm_context.c

@@ -233,7 +233,7 @@ int drm_getsareactx(struct inode *inode, struct file *filp,
 	mutex_unlock(&dev->struct_mutex);
 
 	request.handle = NULL;
-	list_for_each_entry(_entry, &dev->maplist->head, head) {
+	list_for_each_entry(_entry, &dev->maplist, head) {
 		if (_entry->map == map) {
 			request.handle =
 			    (void *)(unsigned long)_entry->user_token;
@@ -268,15 +268,13 @@ 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 list_head *list;
 
 	if (copy_from_user(&request,
 			   (drm_ctx_priv_map_t __user *) arg, sizeof(request)))
 		return -EFAULT;
 
 	mutex_lock(&dev->struct_mutex);
-	list_for_each(list, &dev->maplist->head) {
-		r_list = list_entry(list, drm_map_list_t, head);
+	list_for_each_entry(r_list, &dev->maplist, head) {
 		if (r_list->map
 		    && r_list->user_token == (unsigned long)request.handle)
 			goto found;
@@ -449,7 +447,7 @@ int drm_addctx(struct inode *inode, struct file *filp,
 	ctx_entry->tag = priv;
 
 	mutex_lock(&dev->ctxlist_mutex);
-	list_add(&ctx_entry->head, &dev->ctxlist->head);
+	list_add(&ctx_entry->head, &dev->ctxlist);
 	++dev->ctx_count;
 	mutex_unlock(&dev->ctxlist_mutex);
 
@@ -575,10 +573,10 @@ int drm_rmctx(struct inode *inode, struct file *filp,
 	}
 
 	mutex_lock(&dev->ctxlist_mutex);
-	if (!list_empty(&dev->ctxlist->head)) {
+	if (!list_empty(&dev->ctxlist)) {
 		drm_ctx_list_t *pos, *n;
 
-		list_for_each_entry_safe(pos, n, &dev->ctxlist->head, head) {
+		list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
 			if (pos->handle == ctx.handle) {
 				list_del(&pos->head);
 				drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST);

drivers/char/drm/drm_drv.c

@@ -132,8 +132,8 @@ static drm_ioctl_desc_t drm_ioctls[] = {
 int drm_lastclose(drm_device_t * dev)
 {
 	drm_magic_entry_t *pt, *next;
-	drm_map_list_t *r_list;
-	drm_vma_entry_t *vma, *vma_next;
+	drm_map_list_t *r_list, *list_t;
+	drm_vma_entry_t *vma, *vma_temp;
 	int i;
 
 	DRM_DEBUG("\n");
@@ -178,19 +178,17 @@ int drm_lastclose(drm_device_t * dev)
 
 	/* Clear AGP information */
 	if (drm_core_has_AGP(dev) && dev->agp) {
-		drm_agp_mem_t *entry;
-		drm_agp_mem_t *nexte;
+		drm_agp_mem_t *entry, *tempe;
 
 		/* Remove AGP resources, but leave dev->agp
 		   intact until drv_cleanup is called. */
-		for (entry = dev->agp->memory; entry; entry = nexte) {
-			nexte = entry->next;
+		list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
 			if (entry->bound)
 				drm_unbind_agp(entry->memory);
 			drm_free_agp(entry->memory, entry->pages);
 			drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
 		}
-		dev->agp->memory = NULL;
+		INIT_LIST_HEAD(&dev->agp->memory);
 
 		if (dev->agp->acquired)
 			drm_agp_release(dev);
@@ -204,20 +202,14 @@ int drm_lastclose(drm_device_t * dev)
 	}
 
 	/* Clear vma list (only built for debugging) */
-	if (dev->vmalist) {
-		for (vma = dev->vmalist; vma; vma = vma_next) {
-			vma_next = vma->next;
+	list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
+		list_del(&vma->head);
 		drm_free(vma, sizeof(*vma), DRM_MEM_VMAS);
 	}
-		dev->vmalist = NULL;
-	}
 
-	if (dev->maplist) {
-		while (!list_empty(&dev->maplist->head)) {
-			struct list_head *list = dev->maplist->head.next;
-			r_list = list_entry(list, drm_map_list_t, head);
+	list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 		drm_rmmap_locked(dev, r_list->map);
-		}
+		r_list = NULL;
 	}
 
 	if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) {
@@ -309,11 +301,7 @@ static void drm_cleanup(drm_device_t * dev)
 
 	drm_lastclose(dev);
 
-	if (dev->maplist) {
-		drm_free(dev->maplist, sizeof(*dev->maplist), DRM_MEM_MAPS);
-		dev->maplist = NULL;
 	drm_ht_remove(&dev->map_hash);
-	}
 
 	drm_ctxbitmap_cleanup(dev);
 

drivers/char/drm/drm_fops.c

@@ -79,13 +79,9 @@ static int drm_setup(drm_device_t * dev)
 	drm_ht_create(&dev->magiclist, DRM_MAGIC_HASH_ORDER);
 	INIT_LIST_HEAD(&dev->magicfree);
 
-	dev->ctxlist = drm_alloc(sizeof(*dev->ctxlist), DRM_MEM_CTXLIST);
-	if (dev->ctxlist == NULL)
-		return -ENOMEM;
-	memset(dev->ctxlist, 0, sizeof(*dev->ctxlist));
-	INIT_LIST_HEAD(&dev->ctxlist->head);
+	INIT_LIST_HEAD(&dev->ctxlist);
+	INIT_LIST_HEAD(&dev->vmalist);
 
-	dev->vmalist = NULL;
 	dev->sigdata.lock = NULL;
 	init_waitqueue_head(&dev->lock.lock_queue);
 	dev->queue_count = 0;
@@ -258,6 +254,8 @@ static int drm_open_helper(struct inode *inode, struct file *filp,
 	priv->authenticated = capable(CAP_SYS_ADMIN);
 	priv->lock_count = 0;
 
+	INIT_LIST_HEAD(&priv->lhead);
+
 	if (dev->driver->open) {
 		ret = dev->driver->open(dev, priv);
 		if (ret < 0)
@@ -265,19 +263,10 @@ static int drm_open_helper(struct inode *inode, struct file *filp,
 	}
 
 	mutex_lock(&dev->struct_mutex);
-	if (!dev->file_last) {
-		priv->next = NULL;
-		priv->prev = NULL;
-		dev->file_first = priv;
-		dev->file_last = priv;
-		/* first opener automatically becomes master */
+	if (list_empty(&dev->filelist))
 		priv->master = 1;
-	} else {
-		priv->next = NULL;
-		priv->prev = dev->file_last;
-		dev->file_last->next = priv;
-		dev->file_last = priv;
-	}
+
+	list_add(&priv->lhead, &dev->filelist);
 	mutex_unlock(&dev->struct_mutex);
 
 #ifdef __alpha__
@@ -414,10 +403,10 @@ int drm_release(struct inode *inode, struct file *filp)
 	drm_fasync(-1, filp, 0);
 
 	mutex_lock(&dev->ctxlist_mutex);
-	if (dev->ctxlist && (!list_empty(&dev->ctxlist->head))) {
+	if (!list_empty(&dev->ctxlist)) {
 		drm_ctx_list_t *pos, *n;
 
-		list_for_each_entry_safe(pos, n, &dev->ctxlist->head, head) {
+		list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
 			if (pos->tag == priv &&
 			    pos->handle != DRM_KERNEL_CONTEXT) {
 				if (dev->driver->context_dtor)
@@ -436,22 +425,12 @@ int drm_release(struct inode *inode, struct file *filp)
 
 	mutex_lock(&dev->struct_mutex);
 	if (priv->remove_auth_on_close == 1) {
-		drm_file_t *temp = dev->file_first;
-		while (temp) {
+		drm_file_t *temp;
+
+		list_for_each_entry(temp, &dev->filelist, lhead)
 			temp->authenticated = 0;
-			temp = temp->next;
-		}
-	}
-	if (priv->prev) {
-		priv->prev->next = priv->next;
-	} else {
-		dev->file_first = priv->next;
-	}
-	if (priv->next) {
-		priv->next->prev = priv->prev;
-	} else {
-		dev->file_last = priv->prev;
 	}
+	list_del(&priv->lhead);
 	mutex_unlock(&dev->struct_mutex);
 
 	if (dev->driver->postclose)

drivers/char/drm/drm_ioctl.c

@@ -204,7 +204,7 @@ int drm_getmap(struct inode *inode, struct file *filp,
 	}
 
 	i = 0;
-	list_for_each(list, &dev->maplist->head) {
+	list_for_each(list, &dev->maplist) {
 		if (i == idx) {
 			r_list = list_entry(list, drm_map_list_t, head);
 			break;
@@ -257,12 +257,18 @@ int drm_getclient(struct inode *inode, struct file *filp,
 		return -EFAULT;
 	idx = client.idx;
 	mutex_lock(&dev->struct_mutex);
-	for (i = 0, pt = dev->file_first; i < idx && pt; i++, pt = pt->next) ;
 	
-	if (!pt) {
+	if (list_empty(&dev->filelist)) {
 		mutex_unlock(&dev->struct_mutex);
 		return -EINVAL;
 	}
+
+	i = 0;
+	list_for_each_entry(pt, &dev->filelist, lhead) {
+		if (i++ >= idx)
+			break;
+	}
+
 	client.auth = pt->authenticated;
 	client.pid = pt->pid;
 	client.uid = pt->uid;

drivers/char/drm/drm_irq.c

@@ -120,8 +120,8 @@ static int drm_irq_install(drm_device_t * dev)
 
 		spin_lock_init(&dev->vbl_lock);
 
-		INIT_LIST_HEAD(&dev->vbl_sigs.head);
-		INIT_LIST_HEAD(&dev->vbl_sigs2.head);
+		INIT_LIST_HEAD(&dev->vbl_sigs);
+		INIT_LIST_HEAD(&dev->vbl_sigs2);
 
 		dev->vbl_pending = 0;
 	}
@@ -292,7 +292,7 @@ int drm_wait_vblank(DRM_IOCTL_ARGS)
 
 	if (flags & _DRM_VBLANK_SIGNAL) {
 		unsigned long irqflags;
-		drm_vbl_sig_t *vbl_sigs = (flags & _DRM_VBLANK_SECONDARY)
+		struct list_head *vbl_sigs = (flags & _DRM_VBLANK_SECONDARY)
 				      ? &dev->vbl_sigs2 : &dev->vbl_sigs;
 		drm_vbl_sig_t *vbl_sig;
 
@@ -302,7 +302,7 @@ int drm_wait_vblank(DRM_IOCTL_ARGS)
 		 * for the same vblank sequence number; nothing to be done in
 		 * that case
 		 */
-		list_for_each_entry(vbl_sig, &vbl_sigs->head, head) {
+		list_for_each_entry(vbl_sig, vbl_sigs, head) {
 			if (vbl_sig->sequence == vblwait.request.sequence
 			    && vbl_sig->info.si_signo == vblwait.request.signal
 			    && vbl_sig->task == current) {
@@ -336,7 +336,7 @@ int drm_wait_vblank(DRM_IOCTL_ARGS)
 
 		spin_lock_irqsave(&dev->vbl_lock, irqflags);
 
-		list_add_tail((struct list_head *)vbl_sig, &vbl_sigs->head);
+		list_add_tail(&vbl_sig->head, vbl_sigs);
 
 		spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
 
@@ -379,20 +379,18 @@ void drm_vbl_send_signals(drm_device_t * dev)
 	spin_lock_irqsave(&dev->vbl_lock, flags);
 
 	for (i = 0; i < 2; i++) {
-		struct list_head *list, *tmp;
-		drm_vbl_sig_t *vbl_sig;
-		drm_vbl_sig_t *vbl_sigs = i ? &dev->vbl_sigs2 : &dev->vbl_sigs;
+		drm_vbl_sig_t *vbl_sig, *tmp;
+		struct list_head *vbl_sigs = i ? &dev->vbl_sigs2 : &dev->vbl_sigs;
 		unsigned int vbl_seq = atomic_read(i ? &dev->vbl_received2 :
 						   &dev->vbl_received);
 
-		list_for_each_safe(list, tmp, &vbl_sigs->head) {
-			vbl_sig = list_entry(list, drm_vbl_sig_t, head);
+		list_for_each_entry_safe(vbl_sig, tmp, vbl_sigs, head) {
 			if ((vbl_seq - vbl_sig->sequence) <= (1 << 23)) {
 				vbl_sig->info.si_code = vbl_seq;
 				send_sig_info(vbl_sig->info.si_signo,
 					      &vbl_sig->info, vbl_sig->task);
 
-				list_del(list);
+				list_del(&vbl_sig->head);
 
 				drm_free(vbl_sig, sizeof(*vbl_sig),
 					 DRM_MEM_DRIVER);

drivers/char/drm/drm_memory.c

@@ -94,7 +94,7 @@ static void *agp_remap(unsigned long offset, unsigned long size,
 	offset -= dev->hose->mem_space->start;
 #endif
 
-	for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next)
+	list_for_each_entry(agpmem, &dev->agp->memory, head)
 		if (agpmem->bound <= offset
 		    && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >=
 		    (offset + size))

drivers/char/drm/drm_os_linux.h

@@ -104,7 +104,7 @@ static __inline__ int mtrr_del(int reg, unsigned long base, unsigned long size)
 #define DRM_GETSAREA()							 \
 do { 									 \
 	drm_map_list_t *entry;						 \
-	list_for_each_entry( entry, &dev->maplist->head, head ) {	 \
+	list_for_each_entry( entry, &dev->maplist, head ) {		 \
 		if ( entry->map &&					 \
 		     entry->map->type == _DRM_SHM &&			 \
 		     (entry->map->flags & _DRM_CONTAINS_LOCK) ) {	 \

drivers/char/drm/drm_proc.c

@@ -209,7 +209,6 @@ static int drm__vm_info(char *buf, char **start, off_t offset, int request,
 	int len = 0;
 	drm_map_t *map;
 	drm_map_list_t *r_list;
-	struct list_head *list;
 
 	/* Hardcoded from _DRM_FRAME_BUFFER,
 	   _DRM_REGISTERS, _DRM_SHM, _DRM_AGP, and
@@ -229,9 +228,7 @@ static int drm__vm_info(char *buf, char **start, off_t offset, int request,
 	DRM_PROC_PRINT("slot	 offset	      size type flags	 "
 		       "address mtrr\n\n");
 	i = 0;
-	if (dev->maplist != NULL)
-		list_for_each(list, &dev->maplist->head) {
-		r_list = list_entry(list, drm_map_list_t, head);
+	list_for_each_entry(r_list, &dev->maplist, head) {
 		map = r_list->map;
 		if (!map)
 			continue;
@@ -242,7 +239,8 @@ static int drm__vm_info(char *buf, char **start, off_t offset, int request,
 		DRM_PROC_PRINT("%4d 0x%08lx 0x%08lx %4.4s  0x%02x 0x%08x ",
 			       i,
 			       map->offset,
-			       map->size, type, map->flags, r_list->user_token);
+			       map->size, type, map->flags,
+			       r_list->user_token);
 		if (map->mtrr < 0) {
 			DRM_PROC_PRINT("none\n");
 		} else {
@@ -444,7 +442,7 @@ static int drm__clients_info(char *buf, char **start, off_t offset,
 	*eof = 0;
 
 	DRM_PROC_PRINT("a dev	pid    uid	magic	  ioctls\n\n");
-	for (priv = dev->file_first; priv; priv = priv->next) {
+	list_for_each_entry(priv, &dev->filelist, lhead) {
 		DRM_PROC_PRINT("%c %3d %5d %5d %10u %10lu\n",
 			       priv->authenticated ? 'y' : 'n',
 			       priv->minor,
@@ -497,7 +495,7 @@ static int drm__vma_info(char *buf, char **start, off_t offset, int request,
 	DRM_PROC_PRINT("vma use count: %d, high_memory = %p, 0x%08lx\n",
 		       atomic_read(&dev->vma_count),
 		       high_memory, virt_to_phys(high_memory));
-	for (pt = dev->vmalist; pt; pt = pt->next) {
+	list_for_each_entry(pt, &dev->vmalist, head) {
 		if (!(vma = pt->vma))
 			continue;
 		DRM_PROC_PRINT("\n%5d 0x%08lx-0x%08lx %c%c%c%c%c%c 0x%08lx000",

drivers/char/drm/drm_stub.c

@@ -59,6 +59,7 @@ static int drm_fill_in_dev(drm_device_t * dev, struct pci_dev *pdev,
 {
 	int retcode;
 
+	INIT_LIST_HEAD(&dev->filelist);
 	spin_lock_init(&dev->count_lock);
 	spin_lock_init(&dev->drw_lock);
 	spin_lock_init(&dev->tasklet_lock);
@@ -76,15 +77,12 @@ static int drm_fill_in_dev(drm_device_t * dev, struct pci_dev *pdev,
 #endif
 	dev->irq = pdev->irq;
 
-	dev->maplist = drm_calloc(1, sizeof(*dev->maplist), DRM_MEM_MAPS);
-	if (dev->maplist == NULL)
-		return -ENOMEM;
-	INIT_LIST_HEAD(&dev->maplist->head);
 	if (drm_ht_create(&dev->map_hash, 12)) {
-		drm_free(dev->maplist, sizeof(*dev->maplist), DRM_MEM_MAPS);
 		return -ENOMEM;
 	}
 
+	INIT_LIST_HEAD(&dev->maplist);
+
 	/* the DRM has 6 basic counters */
 	dev->counters = 6;
 	dev->types[0] = _DRM_STAT_LOCK;

drivers/char/drm/drm_vm.c

@@ -116,7 +116,7 @@ static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
 		/*
 		 * It's AGP memory - find the real physical page to map
 		 */
-		for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) {
+		list_for_each_entry(agpmem, &dev->agp->memory, head) {
 			if (agpmem->bound <= baddr &&
 			    agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
 				break;
@@ -196,10 +196,9 @@ static void drm_vm_shm_close(struct vm_area_struct *vma)
 {
 	drm_file_t *priv = vma->vm_file->private_data;
 	drm_device_t *dev = priv->head->dev;
-	drm_vma_entry_t *pt, *prev, *next;
+	drm_vma_entry_t *pt, *temp;
 	drm_map_t *map;
 	drm_map_list_t *r_list;
-	struct list_head *list;
 	int found_maps = 0;
 
 	DRM_DEBUG("0x%08lx,0x%08lx\n",
@@ -209,30 +208,22 @@ static void drm_vm_shm_close(struct vm_area_struct *vma)
 	map = vma->vm_private_data;
 
 	mutex_lock(&dev->struct_mutex);
-	for (pt = dev->vmalist, prev = NULL; pt; pt = next) {
-		next = pt->next;
+	list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 		if (pt->vma->vm_private_data == map)
 			found_maps++;
 		if (pt->vma == vma) {
-			if (prev) {
-				prev->next = pt->next;
-			} else {
-				dev->vmalist = pt->next;
-			}
+			list_del(&pt->head);
 			drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
-		} else {
-			prev = pt;
 		}
 	}
+
 	/* We were the only map that was found */
 	if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
 		/* Check to see if we are in the maplist, if we are not, then
 		 * we delete this mappings information.
 		 */
 		found_maps = 0;
-		list = &dev->maplist->head;
-		list_for_each(list, &dev->maplist->head) {
-			r_list = list_entry(list, drm_map_list_t, head);
+		list_for_each_entry(r_list, &dev->maplist, head) {
 			if (r_list->map == map)
 				found_maps++;
 		}
@@ -425,9 +416,8 @@ static void drm_vm_open_locked(struct vm_area_struct *vma)
 	vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS);
 	if (vma_entry) {
 		vma_entry->vma = vma;
-		vma_entry->next = dev->vmalist;
 		vma_entry->pid = current->pid;
-		dev->vmalist = vma_entry;
+		list_add(&vma_entry->head, &dev->vmalist);
 	}
 }
 
@@ -453,20 +443,16 @@ static void drm_vm_close(struct vm_area_struct *vma)
 {
 	drm_file_t *priv = vma->vm_file->private_data;
 	drm_device_t *dev = priv->head->dev;
-	drm_vma_entry_t *pt, *prev;
+	drm_vma_entry_t *pt, *temp;
 
 	DRM_DEBUG("0x%08lx,0x%08lx\n",
 		  vma->vm_start, vma->vm_end - vma->vm_start);
 	atomic_dec(&dev->vma_count);
 
 	mutex_lock(&dev->struct_mutex);
-	for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) {
+	list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 		if (pt->vma == vma) {
-			if (prev) {
-				prev->next = pt->next;
-			} else {
-				dev->vmalist = pt->next;
-			}
+			list_del(&pt->head);
 			drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
 			break;
 		}

drivers/char/drm/i810_dma.c

@@ -327,12 +327,10 @@ static int i810_dma_initialize(drm_device_t * dev,
 			       drm_i810_private_t * dev_priv,
 			       drm_i810_init_t * init)
 {
-	struct list_head *list;
-
+	drm_map_list_t *r_list;
 	memset(dev_priv, 0, sizeof(drm_i810_private_t));
 
-	list_for_each(list, &dev->maplist->head) {
-		drm_map_list_t *r_list = list_entry(list, drm_map_list_t, head);
+	list_for_each_entry(r_list, &dev->maplist, head) {
 		if (r_list->map &&
 		    r_list->map->type == _DRM_SHM &&
 		    r_list->map->flags & _DRM_CONTAINS_LOCK) {

drivers/char/drm/i830_dma.c

@@ -334,12 +334,11 @@ static int i830_dma_initialize(drm_device_t * dev,
 			       drm_i830_private_t * dev_priv,
 			       drm_i830_init_t * init)
 {
-	struct list_head *list;
+	drm_map_list_t *r_list;
 
 	memset(dev_priv, 0, sizeof(drm_i830_private_t));
 
-	list_for_each(list, &dev->maplist->head) {
-		drm_map_list_t *r_list = list_entry(list, drm_map_list_t, head);
+	list_for_each_entry(r_list, &dev->maplist, head) {
 		if (r_list->map &&
 		    r_list->map->type == _DRM_SHM &&
 		    r_list->map->flags & _DRM_CONTAINS_LOCK) {

drivers/char/drm/mga_dma.c

@@ -551,7 +551,7 @@ static int mga_do_agp_dma_bootstrap(drm_device_t * dev,
 		drm_map_list_t *_entry;
 		unsigned long agp_token = 0;
 		
-		list_for_each_entry(_entry, &dev->maplist->head, head) {
+		list_for_each_entry(_entry, &dev->maplist, head) {
 			if (_entry->map == dev->agp_buffer_map)
 				agp_token = _entry->user_token;
 		}

drivers/char/drm/sis_mm.c

@@ -234,7 +234,7 @@ static drm_local_map_t *sis_reg_init(drm_device_t *dev)
 	drm_map_list_t *entry;
 	drm_local_map_t *map;
 
-	list_for_each_entry(entry, &dev->maplist->head, head) {
+	list_for_each_entry(entry, &dev->maplist, head) {
 		map = entry->map;
 		if (!map)
 			continue;

drivers/char/drm/via_verifier.c

@@ -254,7 +254,6 @@ static __inline__ drm_local_map_t *via_drm_lookup_agp_map(drm_via_state_t *seq,
 						    unsigned long size,
 						    drm_device_t * dev)
 {
-	struct list_head *list;
 	drm_map_list_t *r_list;
 	drm_local_map_t *map = seq->map_cache;
 
@@ -263,8 +262,7 @@ static __inline__ drm_local_map_t *via_drm_lookup_agp_map(drm_via_state_t *seq,
 		return map;
 	}
 
-	list_for_each(list, &dev->maplist->head) {
-		r_list = (drm_map_list_t *) list;
+	list_for_each_entry(r_list, &dev->maplist, head) {
 		map = r_list->map;
 		if (!map)
 			continue;