diff options
| -rw-r--r-- | drivers/mtd/mtdcore.c | 38 | ||||
| -rw-r--r-- | include/linux/mtd/mtd.h | 1 |
2 files changed, 39 insertions, 0 deletions
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index c4d26de74349..06ec9f836ae5 100644 --- 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> @@ -223,6 +224,42 @@ struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num) return ret; } +/** + * 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; + struct mtd_info *mtd = ERR_PTR(-ENODEV); + + 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 (i == MAX_MTD_DEVICES) + goto out_unlock; + + if (!try_module_get(mtd->owner)) + goto out_unlock; + + mtd->usecount++; + +out_unlock: + mutex_unlock(&mtd_table_mutex); + return mtd; +} + void put_mtd_device(struct mtd_info *mtd) { int c; @@ -267,6 +304,7 @@ int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, EXPORT_SYMBOL(add_mtd_device); EXPORT_SYMBOL(del_mtd_device); EXPORT_SYMBOL(get_mtd_device); +EXPORT_SYMBOL(get_mtd_device_nm); EXPORT_SYMBOL(put_mtd_device); EXPORT_SYMBOL(register_mtd_user); EXPORT_SYMBOL(unregister_mtd_user); diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h index 18acb6d0033b..89e937dfef55 100644 --- a/include/linux/mtd/mtd.h +++ b/include/linux/mtd/mtd.h @@ -216,6 +216,7 @@ extern int add_mtd_device(struct mtd_info *mtd); extern int del_mtd_device (struct mtd_info *mtd); extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num); +extern struct mtd_info *get_mtd_device_nm(const char *name); extern void put_mtd_device(struct mtd_info *mtd); |