IPMI: fix hotmod remove lock

The removal of proc entries was done holding a lock, which is no longer
allowed.  There is no need for the lock, only a mutex is required, so switch
over to a mutex.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/char/ipmi/ipmi_msghandler.c

@@ -221,10 +221,8 @@ struct ipmi_smi
 	void                     *send_info;
 
 #ifdef CONFIG_PROC_FS
-	/* A list of proc entries for this interface.  This does not
-	   need a lock, only one thread creates it and only one thread
-	   destroys it. */
-	spinlock_t             proc_entry_lock;
+	/* A list of proc entries for this interface. */
+	struct mutex           proc_entry_lock;
 	struct ipmi_proc_entry *proc_entries;
 #endif
 
@@ -1891,11 +1889,11 @@ int ipmi_smi_add_proc_entry(ipmi_smi_t smi, char *name,
 		file->write_proc = write_proc;
 		file->owner = owner;
 
-		spin_lock(&smi->proc_entry_lock);
+		mutex_lock(&smi->proc_entry_lock);
 		/* Stick it on the list. */
 		entry->next = smi->proc_entries;
 		smi->proc_entries = entry;
-		spin_unlock(&smi->proc_entry_lock);
+		mutex_unlock(&smi->proc_entry_lock);
 	}
 #endif /* CONFIG_PROC_FS */
 
@@ -1939,7 +1937,7 @@ static void remove_proc_entries(ipmi_smi_t smi)
 #ifdef CONFIG_PROC_FS
 	struct ipmi_proc_entry *entry;
 
-	spin_lock(&smi->proc_entry_lock);
+	mutex_lock(&smi->proc_entry_lock);
 	while (smi->proc_entries) {
 		entry = smi->proc_entries;
 		smi->proc_entries = entry->next;
@@ -1948,7 +1946,7 @@ static void remove_proc_entries(ipmi_smi_t smi)
 		kfree(entry->name);
 		kfree(entry);
 	}
-	spin_unlock(&smi->proc_entry_lock);
+	mutex_unlock(&smi->proc_entry_lock);
 	remove_proc_entry(smi->proc_dir_name, proc_ipmi_root);
 #endif /* CONFIG_PROC_FS */
 }
@@ -2679,7 +2677,7 @@ int ipmi_register_smi(struct ipmi_smi_handlers *handlers,
 	}
 	intf->curr_seq = 0;
 #ifdef CONFIG_PROC_FS
-	spin_lock_init(&intf->proc_entry_lock);
+	mutex_init(&intf->proc_entry_lock);
 #endif
 	spin_lock_init(&intf->waiting_msgs_lock);
 	INIT_LIST_HEAD(&intf->waiting_msgs);