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path: root/drivers/mtd/mtdpart.c
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Diffstat (limited to 'drivers/mtd/mtdpart.c')
-rw-r--r--drivers/mtd/mtdpart.c31
1 files changed, 28 insertions, 3 deletions
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 144e6b613a77..29675edb44b4 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -48,8 +48,11 @@ static int part_read(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
struct mtd_part *part = PART(mtd);
+ struct mtd_ecc_stats stats;
int res;
+ stats = part->master->ecc_stats;
+
if (from >= mtd->size)
len = 0;
else if (from + len > mtd->size)
@@ -58,9 +61,9 @@ static int part_read(struct mtd_info *mtd, loff_t from, size_t len,
len, retlen, buf);
if (unlikely(res)) {
if (res == -EUCLEAN)
- mtd->ecc_stats.corrected++;
+ mtd->ecc_stats.corrected += part->master->ecc_stats.corrected - stats.corrected;
if (res == -EBADMSG)
- mtd->ecc_stats.failed++;
+ mtd->ecc_stats.failed += part->master->ecc_stats.failed - stats.failed;
}
return res;
}
@@ -84,6 +87,18 @@ static void part_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
part->master->unpoint(part->master, from + part->offset, len);
}
+static unsigned long part_get_unmapped_area(struct mtd_info *mtd,
+ unsigned long len,
+ unsigned long offset,
+ unsigned long flags)
+{
+ struct mtd_part *part = PART(mtd);
+
+ offset += part->offset;
+ return part->master->get_unmapped_area(part->master, len, offset,
+ flags);
+}
+
static int part_read_oob(struct mtd_info *mtd, loff_t from,
struct mtd_oob_ops *ops)
{
@@ -342,6 +357,12 @@ static struct mtd_part *add_one_partition(struct mtd_info *master,
slave->mtd.name = part->name;
slave->mtd.owner = master->owner;
+ slave->mtd.backing_dev_info = master->backing_dev_info;
+
+ /* NOTE: we don't arrange MTDs as a tree; it'd be error-prone
+ * to have the same data be in two different partitions.
+ */
+ slave->mtd.dev.parent = master->dev.parent;
slave->mtd.read = part_read;
slave->mtd.write = part_write;
@@ -354,6 +375,8 @@ static struct mtd_part *add_one_partition(struct mtd_info *master,
slave->mtd.unpoint = part_unpoint;
}
+ if (master->get_unmapped_area)
+ slave->mtd.get_unmapped_area = part_get_unmapped_area;
if (master->read_oob)
slave->mtd.read_oob = part_read_oob;
if (master->write_oob)
@@ -493,7 +516,9 @@ out_register:
* This function, given a master MTD object and a partition table, creates
* and registers slave MTD objects which are bound to the master according to
* the partition definitions.
- * (Q: should we register the master MTD object as well?)
+ *
+ * We don't register the master, or expect the caller to have done so,
+ * for reasons of data integrity.
*/
int add_mtd_partitions(struct mtd_info *master,