[PATCH] libertas: don't cast a pointer to pointer of

[Holger Schurig <hs4233@mail.mn-solutions.de>]

Don't cast struct foo * to struct list_head *, it's safe only when
the list member is the first member of struct foo.

Also don't cast struct list_head * to struct foo *.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>


Index: wireless-2.6/drivers/net/wireless/libertas/cmd.c
===================================================================
--- wireless-2.6.orig/drivers/net/wireless/libertas/cmd.c	2007-12-06 12:47:21.000000000 +0100
+++ wireless-2.6/drivers/net/wireless/libertas/cmd.c	2007-12-06 12:54:47.000000000 +0100
@@ -1016,11 +1016,10 @@ void lbs_queue_cmd(struct lbs_adapter *a
 	spin_lock_irqsave(&adapter->driver_lock, flags);
 
 	if (addtail) {
-		list_add_tail((struct list_head *)cmdnode,
-			      &adapter->cmdpendingq);
+		list_add_tail(&cmdnode->list, &adapter->cmdpendingq);
 		adapter->nr_cmd_pending++;
 	} else
-		list_add((struct list_head *)cmdnode, &adapter->cmdpendingq);
+		list_add(&cmdnode->list, &adapter->cmdpendingq);
 
 	spin_unlock_irqrestore(&adapter->driver_lock, flags);
 
@@ -1139,7 +1138,7 @@ void __lbs_cleanup_and_insert_cmd(struct
 		return;
 
 	cleanup_cmdnode(ptempcmd);
-	list_add_tail((struct list_head *)ptempcmd, &adapter->cmdfreeq);
+	list_add_tail(&ptempcmd->list, &adapter->cmdfreeq);
 }
 
 static void lbs_cleanup_and_insert_cmd(struct lbs_private *priv,
@@ -1637,8 +1636,9 @@ struct cmd_ctrl_node *lbs_get_free_cmd_c
 	spin_lock_irqsave(&adapter->driver_lock, flags);
 
 	if (!list_empty(&adapter->cmdfreeq)) {
-		tempnode = (struct cmd_ctrl_node *)adapter->cmdfreeq.next;
-		list_del((struct list_head *)tempnode);
+		tempnode = list_first_entry(&adapter->cmdfreeq,
+					    struct cmd_ctrl_node, list);
+		list_del(&tempnode->list);
 	} else {
 		lbs_deb_host("GET_CMD_NODE: cmd_ctrl_node is not available\n");
 		tempnode = NULL;
@@ -1735,8 +1735,8 @@ int lbs_execute_next_command(struct lbs_
 	}
 
 	if (!list_empty(&adapter->cmdpendingq)) {
-		cmdnode = (struct cmd_ctrl_node *)
-		    adapter->cmdpendingq.next;
+		cmdnode = list_first_entry(&adapter->cmdpendingq,
+					   struct cmd_ctrl_node, list);
 	}
 
 	spin_unlock_irqrestore(&adapter->driver_lock, flags);
@@ -1800,7 +1800,7 @@ int lbs_execute_next_command(struct lbs_
 				    cpu_to_le16(CMD_SUBCMD_EXIT_PS)) {
 					lbs_deb_host(
 					       "EXEC_NEXT_CMD: ignore ENTER_PS cmd\n");
-					list_del((struct list_head *)cmdnode);
+					list_del(&cmdnode->list);
 					lbs_cleanup_and_insert_cmd(priv, cmdnode);
 
 					ret = 0;
@@ -1811,7 +1811,7 @@ int lbs_execute_next_command(struct lbs_
 				    (adapter->psstate == PS_STATE_PRE_SLEEP)) {
 					lbs_deb_host(
 					       "EXEC_NEXT_CMD: ignore EXIT_PS cmd in sleep\n");
-					list_del((struct list_head *)cmdnode);
+					list_del(&cmdnode->list);
 					lbs_cleanup_and_insert_cmd(priv, cmdnode);
 					adapter->needtowakeup = 1;
 
@@ -1823,7 +1823,7 @@ int lbs_execute_next_command(struct lbs_
 				       "EXEC_NEXT_CMD: sending EXIT_PS\n");
 			}
 		}
-		list_del((struct list_head *)cmdnode);
+		list_del(&cmdnode->list);
 		lbs_deb_host("EXEC_NEXT_CMD: sending command 0x%04x\n",
 			    le16_to_cpu(cmdptr->command));
 		DownloadcommandToStation(priv, cmdnode);