mtd: part: Remove partition overlap checks
This patch makes MTD dynamic partitioning more flexible by removing
overlap checks for dynamic partitions. I don't see any particular
reason why overlapping dynamic partitions should be prohibited while
static partitions are allowed to overlap freely.
The checks previously had an off-by-one error, where 'end' should be
one less than what it is currently set at, and adding partitions out of
increasing order will fail. Disabling the checks resolves this issue.
Signed-off-by: Dan Ehrenberg <dehrenberg@chromium.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index be80340..cafdb88 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -582,8 +582,7 @@
long long offset, long long length)
{
struct mtd_partition part;
- struct mtd_part *p, *new;
- uint64_t start, end;
+ struct mtd_part *new;
int ret = 0;
/* the direct offset is expected */
@@ -607,21 +606,7 @@
if (IS_ERR(new))
return PTR_ERR(new);
- start = offset;
- end = offset + length;
-
mutex_lock(&mtd_partitions_mutex);
- list_for_each_entry(p, &mtd_partitions, list)
- if (p->master == master) {
- if ((start >= p->offset) &&
- (start < (p->offset + p->mtd.size)))
- goto err_inv;
-
- if ((end >= p->offset) &&
- (end < (p->offset + p->mtd.size)))
- goto err_inv;
- }
-
list_add(&new->list, &mtd_partitions);
mutex_unlock(&mtd_partitions_mutex);
@@ -630,10 +615,6 @@
mtd_add_partition_attrs(new);
return ret;
-err_inv:
- mutex_unlock(&mtd_partitions_mutex);
- free_partition(new);
- return -EINVAL;
}
EXPORT_SYMBOL_GPL(mtd_add_partition);