From 3a434f66e6dab645d74a59c95651cdbe16497a50 Mon Sep 17 00:00:00 2001 From: Dan Ehrenberg Date: Thu, 2 Apr 2015 15:15:12 -0700 Subject: 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 Signed-off-by: Brian Norris 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 @@ int mtd_add_partition(struct mtd_info *master, const char *name, 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 @@ int mtd_add_partition(struct mtd_info *master, const char *name, 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 @@ int mtd_add_partition(struct mtd_info *master, const char *name, 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); -- cgit v0.10.2