5 files changed, 109 insertions, 21 deletions

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index eeb9f6668e69..3c5904834fe8 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -361,7 +361,7 @@ static void mmc_decode_cid(struct mmc_card *card)
 
         default:
                 printk("%s: card has unknown MMCA version %d\n",
-                        card->host->host_name, card->csd.mmca_vsn);
+                        mmc_hostname(card->host), card->csd.mmca_vsn);
                 mmc_card_set_bad(card);
                 break;
         }
@@ -383,7 +383,7 @@ static void mmc_decode_csd(struct mmc_card *card)
         csd_struct = UNSTUFF_BITS(resp, 126, 2);
         if (csd_struct != 1 && csd_struct != 2) {
                 printk("%s: unrecognised CSD structure version %d\n",
-                        card->host->host_name, csd_struct);
+                        mmc_hostname(card->host), csd_struct);
                 mmc_card_set_bad(card);
                 return;
         }
@@ -551,7 +551,7 @@ static void mmc_discover_cards(struct mmc_host *host)
                 }
                 if (err != MMC_ERR_NONE) {
                         printk(KERN_ERR "%s: error requesting CID: %d\n",
-                                host->host_name, err);
+                                mmc_hostname(host), err);
                         break;
                 }
 
@@ -796,17 +796,13 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
 {
         struct mmc_host *host;
 
-        host = kmalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
+        host = mmc_alloc_host_sysfs(extra, dev);
         if (host) {
-                memset(host, 0, sizeof(struct mmc_host) + extra);
-
                 spin_lock_init(&host->lock);
                 init_waitqueue_head(&host->wq);
                 INIT_LIST_HEAD(&host->cards);
                 INIT_WORK(&host->detect, mmc_rescan, host);
 
-                host->dev = dev;
-
                 /*
                  * By default, hosts do not support SGIO or large requests.
                  * They have to set these according to their abilities.
@@ -828,15 +824,15 @@ EXPORT_SYMBOL(mmc_alloc_host);
  */
 int mmc_add_host(struct mmc_host *host)
 {
-        static unsigned int host_num;
+        int ret;
 
-        snprintf(host->host_name, sizeof(host->host_name),
-                 "mmc%d", host_num++);
-
-        mmc_power_off(host);
-        mmc_detect_change(host);
+        ret = mmc_add_host_sysfs(host);
+        if (ret == 0) {
+                mmc_power_off(host);
+                mmc_detect_change(host);
+        }
 
-        return 0;
+        return ret;
 }
 
 EXPORT_SYMBOL(mmc_add_host);
@@ -859,6 +855,7 @@ void mmc_remove_host(struct mmc_host *host)
         }
 
         mmc_power_off(host);
+        mmc_remove_host_sysfs(host);
 }
 
 EXPORT_SYMBOL(mmc_remove_host);
@@ -872,7 +869,7 @@ EXPORT_SYMBOL(mmc_remove_host);
 void mmc_free_host(struct mmc_host *host)
 {
         flush_scheduled_work();
-        kfree(host);
+        mmc_free_host_sysfs(host);
 }
 
 EXPORT_SYMBOL(mmc_free_host);
diff --git a/drivers/mmc/mmc.h b/drivers/mmc/mmc.h
index b498dffe0b11..97bae00292fa 100644
--- a/drivers/mmc/mmc.h
+++ b/drivers/mmc/mmc.h
@@ -13,4 +13,9 @@
 void mmc_init_card(struct mmc_card *card, struct mmc_host *host);
 int mmc_register_card(struct mmc_card *card);
 void mmc_remove_card(struct mmc_card *card);
+
+struct mmc_host *mmc_alloc_host_sysfs(int extra, struct device *dev);
+int mmc_add_host_sysfs(struct mmc_host *host);
+void mmc_remove_host_sysfs(struct mmc_host *host);
+void mmc_free_host_sysfs(struct mmc_host *host);
 #endif
diff --git a/drivers/mmc/mmc_sysfs.c b/drivers/mmc/mmc_sysfs.c
index 5556cd3b5559..ad8949810fc5 100644
--- a/drivers/mmc/mmc_sysfs.c
+++ b/drivers/mmc/mmc_sysfs.c
@@ -12,6 +12,7 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/device.h>
+#include <linux/idr.h>
 
 #include <linux/mmc/card.h>
 #include <linux/mmc/host.h>
@@ -20,6 +21,7 @@
 
 #define dev_to_mmc_card(d)      container_of(d, struct mmc_card, dev)
 #define to_mmc_driver(d)        container_of(d, struct mmc_driver, drv)
+#define cls_dev_to_mmc_host(d)  container_of(d, struct mmc_host, class_dev)
 
 #define MMC_ATTR(name, fmt, args...)                                    \
 static ssize_t mmc_##name##_show (struct device *dev, struct device_attribute *attr, char *buf) \
@@ -206,7 +208,7 @@ void mmc_init_card(struct mmc_card *card, struct mmc_host *host)
 int mmc_register_card(struct mmc_card *card)
 {
         snprintf(card->dev.bus_id, sizeof(card->dev.bus_id),
-                 "%s:%04x", card->host->host_name, card->rca);
+                 "%s:%04x", mmc_hostname(card->host), card->rca);
 
         return device_add(&card->dev);
 }
@@ -224,13 +226,97 @@ void mmc_remove_card(struct mmc_card *card)
 }
 
 
+static void mmc_host_classdev_release(struct class_device *dev)
+{
+        struct mmc_host *host = cls_dev_to_mmc_host(dev);
+        kfree(host);
+}
+
+static struct class mmc_host_class = {
+        .name           = "mmc_host",
+        .release        = mmc_host_classdev_release,
+};
+
+static DEFINE_IDR(mmc_host_idr);
+static DEFINE_SPINLOCK(mmc_host_lock);
+
+/*
+ * Internal function. Allocate a new MMC host.
+ */
+struct mmc_host *mmc_alloc_host_sysfs(int extra, struct device *dev)
+{
+        struct mmc_host *host;
+
+        host = kmalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
+        if (host) {
+                memset(host, 0, sizeof(struct mmc_host) + extra);
+
+                host->dev = dev;
+                host->class_dev.dev = host->dev;
+                host->class_dev.class = &mmc_host_class;
+                class_device_initialize(&host->class_dev);
+        }
+
+        return host;
+}
+
+/*
+ * Internal function. Register a new MMC host with the MMC class.
+ */
+int mmc_add_host_sysfs(struct mmc_host *host)
+{
+        int err;
+
+        if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL))
+                return -ENOMEM;
+
+        spin_lock(&mmc_host_lock);
+        err = idr_get_new(&mmc_host_idr, host, &host->index);
+        spin_unlock(&mmc_host_lock);
+        if (err)
+                return err;
+
+        snprintf(host->class_dev.class_id, BUS_ID_SIZE,
+                 "mmc%d", host->index);
+
+        return class_device_add(&host->class_dev);
+}
+
+/*
+ * Internal function. Unregister a MMC host with the MMC class.
+ */
+void mmc_remove_host_sysfs(struct mmc_host *host)
+{
+        class_device_del(&host->class_dev);
+
+        spin_lock(&mmc_host_lock);
+        idr_remove(&mmc_host_idr, host->index);
+        spin_unlock(&mmc_host_lock);
+}
+
+/*
+ * Internal function. Free a MMC host.
+ */
+void mmc_free_host_sysfs(struct mmc_host *host)
+{
+        class_device_put(&host->class_dev);
+}
+
+
 static int __init mmc_init(void)
 {
-        return bus_register(&mmc_bus_type);
+        int ret = bus_register(&mmc_bus_type);
+        if (ret == 0) {
+                ret = class_register(&mmc_host_class);
+                if (ret)
+                        bus_unregister(&mmc_bus_type);
+        }
+        return ret;
 }
 
 static void __exit mmc_exit(void)
 {
+        class_unregister(&mmc_host_class);
         bus_unregister(&mmc_bus_type);
 }
 
diff --git a/drivers/mmc/mmci.c b/drivers/mmc/mmci.c
index 7a42966d755b..716c4ef4faf6 100644
--- a/drivers/mmc/mmci.c
+++ b/drivers/mmc/mmci.c
@@ -34,7 +34,7 @@
 
 #ifdef CONFIG_MMC_DEBUG
 #define DBG(host,fmt,args...)   \
-        pr_debug("%s: %s: " fmt, host->mmc->host_name, __func__ , args)
+        pr_debug("%s: %s: " fmt, mmc_hostname(host->mmc), __func__ , args)
 #else
 #define DBG(host,fmt,args...)   do { } while (0)
 #endif
@@ -541,7 +541,7 @@ static int mmci_probe(struct amba_device *dev, void *id)
         mmc_add_host(mmc);
 
         printk(KERN_INFO "%s: MMCI rev %x cfg %02x at 0x%08lx irq %d,%d\n",
-                mmc->host_name, amba_rev(dev), amba_config(dev),
+                mmc_hostname(mmc), amba_rev(dev), amba_config(dev),
                 dev->res.start, dev->irq[0], dev->irq[1]);
 
         init_timer(&host->timer);
diff --git a/drivers/mmc/wbsd.c b/drivers/mmc/wbsd.c
index 974f2f36bdbe..402c2d661fb2 100644
--- a/drivers/mmc/wbsd.c
+++ b/drivers/mmc/wbsd.c
@@ -1796,7 +1796,7 @@ static int __devinit wbsd_init(struct device* dev, int base, int irq, int dma,
         
         mmc_add_host(mmc);
 
-        printk(KERN_INFO "%s: W83L51xD", mmc->host_name);
+        printk(KERN_INFO "%s: W83L51xD", mmc_hostname(mmc));
         if (host->chip_id != 0)
                 printk(" id %x", (int)host->chip_id);
         printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);