Add an MTD_IS_PARTITION flag so that the test to check whether an
MTD device is a partition or not is faster.
This also allows user-space programs to know whether they are
manipulating a partition or a real device.
Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
---
drivers/mtd/mtdpart.c | 14 ++------------
include/uapi/mtd/mtd-abi.h | 1 +
2 files changed, 3 insertions(+), 12 deletions(-)
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 919a936..3dc479f 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -370,6 +370,7 @@ static struct mtd_part *allocate_partition(struct mtd_info *master,
/* set up the MTD object for this partition */
slave->mtd.type = master->type;
slave->mtd.flags = master->flags & ~part->mask_flags;
+ slave->mtd.flags |= MTD_IS_PARTITION;
slave->mtd.size = part->size;
slave->mtd.writesize = master->writesize;
slave->mtd.writebufsize = master->writebufsize;
@@ -779,18 +780,7 @@ int parse_mtd_partitions(struct mtd_info *master, const char *const *types,
int mtd_is_partition(const struct mtd_info *mtd)
{
- struct mtd_part *part;
- int ispart = 0;
-
- mutex_lock(&mtd_partitions_mutex);
- list_for_each_entry(part, &mtd_partitions, list)
- if (&part->mtd == mtd) {
- ispart = 1;
- break;
- }
- mutex_unlock(&mtd_partitions_mutex);
-
- return ispart;
+ return mtd->flags & MTD_IS_PARTITION;
}
EXPORT_SYMBOL_GPL(mtd_is_partition);
diff --git a/include/uapi/mtd/mtd-abi.h b/include/uapi/mtd/mtd-abi.h
index 763bb69..ffc1903 100644
--- a/include/uapi/mtd/mtd-abi.h
+++ b/include/uapi/mtd/mtd-abi.h
@@ -103,6 +103,7 @@ struct mtd_write_req {
#define MTD_BIT_WRITEABLE 0x800 /* Single bits can be flipped */
#define MTD_NO_ERASE 0x1000 /* No erase necessary */
#define MTD_POWERUP_LOCK 0x2000 /* Always locked after reset */
+#define MTD_IS_PARTITION 0x4000 /* Device is an MTD partition */
/* Some common devices / combinations of capabilities */
#define MTD_CAP_ROM 0
--
1.9.1
--
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