Merge ../linux-2.6-watchdog-mm

[pandora-kernel.git] / drivers / mtd / mtdcore.c

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 168d3ba..7070110 100644 (file)
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -15,6 +15,7 @@
 #include <linux/timer.h>
 #include <linux/major.h>
 #include <linux/fs.h>
+#include <linux/err.h>
 #include <linux/ioctl.h>
 #include <linux/init.h>
 #include <linux/mtd/compatmac.h>
@@ -57,6 +58,16 @@ int add_mtd_device(struct mtd_info *mtd)
                        mtd->index = i;
                        mtd->usecount = 0;
 
+                       /* Some chips always power up locked. Unlock them now */
+                       if ((mtd->flags & MTD_WRITEABLE)
+                           && (mtd->flags & MTD_STUPID_LOCK) && mtd->unlock) {
+                               if (mtd->unlock(mtd, 0, mtd->size))
+                                       printk(KERN_WARNING
+                                              "%s: unlock failed, "
+                                              "writes may not work\n",
+                                              mtd->name);
+                       }
+
                        DEBUG(0, "mtd: Giving out device %d to %s\n",i, mtd->name);
                        /* No need to get a refcount on the module containing
                           the notifier, since we hold the mtd_table_mutex */
@@ -182,14 +193,14 @@ int unregister_mtd_user (struct mtd_notifier *old)
  *     Given a number and NULL address, return the num'th entry in the device
  *     table, if any.  Given an address and num == -1, search the device table
  *     for a device with that address and return if it's still present. Given
- *     both, return the num'th driver only if its address matches. Return NULL
- *     if not.
+ *     both, return the num'th driver only if its address matches. Return
+ *     error code if not.
  */
 
 struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num)
 {
        struct mtd_info *ret = NULL;
-       int i;
+       int i, err = -ENODEV;
 
        mutex_lock(&mtd_table_mutex);
 
@@ -203,14 +214,73 @@ struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num)
                        ret = NULL;
        }
 
-       if (ret && !try_module_get(ret->owner))
-               ret = NULL;
+       if (!ret)
+               goto out_unlock;
 
-       if (ret)
-               ret->usecount++;
+       if (!try_module_get(ret->owner))
+               goto out_unlock;
 
+       if (ret->get_device) {
+               err = ret->get_device(ret);
+               if (err)
+                       goto out_put;
+       }
+
+       ret->usecount++;
        mutex_unlock(&mtd_table_mutex);
        return ret;
+
+out_put:
+       module_put(ret->owner);
+out_unlock:
+       mutex_unlock(&mtd_table_mutex);
+       return ERR_PTR(err);
+}
+
+/**
+ *     get_mtd_device_nm - obtain a validated handle for an MTD device by
+ *     device name
+ *     @name: MTD device name to open
+ *
+ *     This function returns MTD device description structure in case of
+ *     success and an error code in case of failure.
+ */
+
+struct mtd_info *get_mtd_device_nm(const char *name)
+{
+       int i, err = -ENODEV;
+       struct mtd_info *mtd = NULL;
+
+       mutex_lock(&mtd_table_mutex);
+
+       for (i = 0; i < MAX_MTD_DEVICES; i++) {
+               if (mtd_table[i] && !strcmp(name, mtd_table[i]->name)) {
+                       mtd = mtd_table[i];
+                       break;
+               }
+       }
+
+       if (!mtd)
+               goto out_unlock;
+
+       if (!try_module_get(mtd->owner))
+               goto out_unlock;
+
+       if (mtd->get_device) {
+               err = mtd->get_device(mtd);
+               if (err)
+                       goto out_put;
+       }
+
+       mtd->usecount++;
+       mutex_unlock(&mtd_table_mutex);
+       return mtd;
+
+out_put:
+       module_put(mtd->owner);
+out_unlock:
+       mutex_unlock(&mtd_table_mutex);
+       return ERR_PTR(err);
 }
 
 void put_mtd_device(struct mtd_info *mtd)
@@ -219,6 +289,8 @@ void put_mtd_device(struct mtd_info *mtd)
 
        mutex_lock(&mtd_table_mutex);
        c = --mtd->usecount;
+       if (mtd->put_device)
+               mtd->put_device(mtd);
        mutex_unlock(&mtd_table_mutex);
        BUG_ON(c < 0);
 
@@ -226,7 +298,7 @@ void put_mtd_device(struct mtd_info *mtd)
 }
 
 /* default_mtd_writev - default mtd writev method for MTD devices that
- *                     dont implement their own
+ *                     don't implement their own
  */
 
 int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
@@ -254,13 +326,14 @@ int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
        return ret;
 }
 
-EXPORT_SYMBOL(add_mtd_device);
-EXPORT_SYMBOL(del_mtd_device);
-EXPORT_SYMBOL(get_mtd_device);
-EXPORT_SYMBOL(put_mtd_device);
-EXPORT_SYMBOL(register_mtd_user);
-EXPORT_SYMBOL(unregister_mtd_user);
-EXPORT_SYMBOL(default_mtd_writev);
+EXPORT_SYMBOL_GPL(add_mtd_device);
+EXPORT_SYMBOL_GPL(del_mtd_device);
+EXPORT_SYMBOL_GPL(get_mtd_device);
+EXPORT_SYMBOL_GPL(get_mtd_device_nm);
+EXPORT_SYMBOL_GPL(put_mtd_device);
+EXPORT_SYMBOL_GPL(register_mtd_user);
+EXPORT_SYMBOL_GPL(unregister_mtd_user);
+EXPORT_SYMBOL_GPL(default_mtd_writev);
 
 #ifdef CONFIG_PROC_FS