omap mailbox: fix empty struct device for omap_mbox

Since "mbox->dev" doesn't exist and isn't created either at
registration, this patch will create "struct device", which belongs to
"omap-mailbox" class and set this pointer for the member of
"struct omap_mbox".

Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>

2 files changed, 33 insertions, 34 deletions

diff --git a/arch/arm/plat-omap/include/mach/mailbox.h b/arch/arm/plat-omap/include/mach/mailbox.h
index 7cbed9332e16..577db6852f43 100644
--- a/arch/arm/plat-omap/include/mach/mailbox.h
+++ b/arch/arm/plat-omap/include/mach/mailbox.h
@@ -53,7 +53,7 @@ struct omap_mbox {
 
         mbox_msg_t              seq_snd, seq_rcv;
 
-        struct device           dev;
+        struct device           *dev;
 
         struct omap_mbox        *next;
         void                    *priv;
@@ -67,7 +67,7 @@ void omap_mbox_init_seq(struct omap_mbox *);
 struct omap_mbox *omap_mbox_get(const char *);
 void omap_mbox_put(struct omap_mbox *);
 
-int omap_mbox_register(struct omap_mbox *);
+int omap_mbox_register(struct device *parent, struct omap_mbox *);
 int omap_mbox_unregister(struct omap_mbox *);
 
 #endif /* MAILBOX_H */
diff --git a/arch/arm/plat-omap/mailbox.c b/arch/arm/plat-omap/mailbox.c
index b52ce053e6f2..75ede474d844 100644
--- a/arch/arm/plat-omap/mailbox.c
+++ b/arch/arm/plat-omap/mailbox.c
@@ -1,10 +1,9 @@
 /*
  * OMAP mailbox driver
  *
- * Copyright (C) 2006 Nokia Corporation. All rights reserved.
+ * Copyright (C) 2006-2009 Nokia Corporation. All rights reserved.
  *
- * Contact: Toshihiro Kobayashi <toshihiro.kobayashi@nokia.com>
- *              Restructured by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
+ * Contact: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -136,7 +135,7 @@ static void mbox_rx_work(struct work_struct *work)
         unsigned long flags;
 
         if (mbox->rxq->callback == NULL) {
-                sysfs_notify(&mbox->dev.kobj, NULL, "mbox");
+                sysfs_notify(&mbox->dev->kobj, NULL, "mbox");
                 return;
         }
 
@@ -204,7 +203,7 @@ static void __mbox_rx_interrupt(struct omap_mbox *mbox)
         /* no more messages in the fifo. clear IRQ source. */
         ack_mbox_irq(mbox, IRQ_RX);
         enable_mbox_irq(mbox, IRQ_RX);
-        nomem:
+nomem:
         schedule_work(&mbox->rxq->work);
 }
 
@@ -286,7 +285,7 @@ static ssize_t mbox_show(struct class *class, char *buf)
 static CLASS_ATTR(mbox, S_IRUGO, mbox_show, NULL);
 
 static struct class omap_mbox_class = {
-        .name = "omap_mbox",
+        .name = "omap-mailbox",
 };
 
 static struct omap_mbox_queue *mbox_queue_alloc(struct omap_mbox *mbox,
@@ -333,21 +332,6 @@ static int omap_mbox_init(struct omap_mbox *mbox)
                         return ret;
         }
 
-        mbox->dev.class = &omap_mbox_class;
-        dev_set_name(&mbox->dev, "%s", mbox->name);
-        dev_set_drvdata(&mbox->dev, mbox);
-
-        ret = device_register(&mbox->dev);
-        if (unlikely(ret))
-                goto fail_device_reg;
-
-        ret = device_create_file(&mbox->dev, &dev_attr_mbox);
-        if (unlikely(ret)) {
-                printk(KERN_ERR
-                        "device_create_file failed: %d\n", ret);
-                goto fail_create_mbox;
-        }
-
         ret = request_irq(mbox->irq, mbox_interrupt, IRQF_DISABLED,
                                 mbox->name, mbox);
         if (unlikely(ret)) {
@@ -377,10 +361,6 @@ static int omap_mbox_init(struct omap_mbox *mbox)
  fail_alloc_txq:
         free_irq(mbox->irq, mbox);
  fail_request_irq:
-        device_remove_file(&mbox->dev, &dev_attr_mbox);
- fail_create_mbox:
-        device_unregister(&mbox->dev);
- fail_device_reg:
         if (unlikely(mbox->ops->shutdown))
                 mbox->ops->shutdown(mbox);
 
@@ -393,8 +373,6 @@ static void omap_mbox_fini(struct omap_mbox *mbox)
         mbox_queue_free(mbox->rxq);
 
         free_irq(mbox->irq, mbox);
-        device_remove_file(&mbox->dev, &dev_attr_mbox);
-        class_unregister(&omap_mbox_class);
 
         if (unlikely(mbox->ops->shutdown))
                 mbox->ops->shutdown(mbox);
@@ -440,7 +418,7 @@ void omap_mbox_put(struct omap_mbox *mbox)
 }
 EXPORT_SYMBOL(omap_mbox_put);
 
-int omap_mbox_register(struct omap_mbox *mbox)
+int omap_mbox_register(struct device *parent, struct omap_mbox *mbox)
 {
         int ret = 0;
         struct omap_mbox **tmp;
@@ -450,14 +428,31 @@ int omap_mbox_register(struct omap_mbox *mbox)
         if (mbox->next)
                 return -EBUSY;
 
+        mbox->dev = device_create(&omap_mbox_class,
+                                  parent, 0, mbox, "%s", mbox->name);
+        if (IS_ERR(mbox->dev))
+                return PTR_ERR(mbox->dev);
+
+        ret = device_create_file(mbox->dev, &dev_attr_mbox);
+        if (ret)
+                goto err_sysfs;
+
         write_lock(&mboxes_lock);
         tmp = find_mboxes(mbox->name);
-        if (*tmp)
+        if (*tmp) {
                 ret = -EBUSY;
-        else
-                *tmp = mbox;
+                write_unlock(&mboxes_lock);
+                goto err_find;
+        }
+        *tmp = mbox;
         write_unlock(&mboxes_lock);
 
+        return 0;
+
+err_find:
+        device_remove_file(mbox->dev, &dev_attr_mbox);
+err_sysfs:
+        device_unregister(mbox->dev);
         return ret;
 }
 EXPORT_SYMBOL(omap_mbox_register);
@@ -473,6 +468,8 @@ int omap_mbox_unregister(struct omap_mbox *mbox)
                         *tmp = mbox->next;
                         mbox->next = NULL;
                         write_unlock(&mboxes_lock);
+                        device_remove_file(mbox->dev, &dev_attr_mbox);
+                        device_unregister(mbox->dev);
                         return 0;
                 }
                 tmp = &(*tmp)->next;
@@ -501,4 +498,6 @@ static void __exit omap_mbox_class_exit(void)
 subsys_initcall(omap_mbox_class_init);
 module_exit(omap_mbox_class_exit);
 
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("omap mailbox: interrupt driven messaging");
+MODULE_AUTHOR("Toshihiro Kobayashi and Hiroshi DOYU");