From 62082e56cbb807cb325a8968f35dbd922432eb48 Mon Sep 17 00:00:00 2001
From: Richard Genoud <richard.genoud@gmail.com>
Date: Tue, 10 Jul 2012 18:23:40 +0200
Subject: [PATCH] mtd: mtdparts: introduce mtd_get_device_size
'mtd_get_device_size()' returns the size of the whole MTD device, that is the
mtd_info master size. This will be used by UBI to calculate the maximum number
of bad blocks (MBB) on a MTD device.
Artem: amended the patch a bit.
Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
---
drivers/mtd/mtdpart.c | 10 ++++++++++
include/linux/mtd/partitions.h | 1 +
2 files changed, 11 insertions(+)
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 85005846f30d5..3a49e6de5e603 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -760,3 +760,13 @@ int mtd_is_partition(const struct mtd_info *mtd)
return ispart;
}
EXPORT_SYMBOL_GPL(mtd_is_partition);
+
+/* Returns the size of the entire flash chip */
+uint64_t mtd_get_device_size(const struct mtd_info *mtd)
+{
+ if (!mtd_is_partition(mtd))
+ return mtd->size;
+
+ return PART(mtd)->master->size;
+}
+EXPORT_SYMBOL_GPL(mtd_get_device_size);
diff --git a/include/linux/mtd/partitions.h b/include/linux/mtd/partitions.h
index 02a51157a1732..1f8d24bdafdac 100644
--- a/include/linux/mtd/partitions.h
+++ b/include/linux/mtd/partitions.h
@@ -83,5 +83,6 @@ int mtd_is_partition(const struct mtd_info *mtd);
int mtd_add_partition(struct mtd_info *master, char *name,
long long offset, long long length);
int mtd_del_partition(struct mtd_info *master, int partno);
+uint64_t mtd_get_device_size(const struct mtd_info *mtd);
#endif
--
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