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mtd: partitions: add helper for deleting partition 

There are two similar functions handling deletion. One handles single
partition and another the whole MTD flash device. They share (duplicate)
some code so it makes sense to add a small helper for that part.

Function del_mtd_partitions has been moved a bit to keep all deleting
stuff together.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Rafał Miłecki 2017-06-21 08:26:42 +02:00 committed by Brian Norris
parent 01f9c7240a
commit 08263a9ae6
1 changed files with 43 additions and 32 deletions
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75
drivers/mtd/mtdpart.c
View File

@ -363,32 +363,6 @@ static inline void free_partition(struct mtd_part *p)
kfree(p);
}
/*
* This function unregisters and destroy all slave MTD objects which are
* attached to the given master MTD object.
*/
int del_mtd_partitions(struct mtd_info *master)
{
struct mtd_part *slave, *next;
int ret, err = 0;
mutex_lock(&mtd_partitions_mutex);
list_for_each_entry_safe(slave, next, &mtd_partitions, list)
if (slave->master == master) {
ret = del_mtd_device(&slave->mtd);
if (ret < 0) {
err = ret;
continue;
}
list_del(&slave->list);
free_partition(slave);
}
mutex_unlock(&mtd_partitions_mutex);
return err;
}
static struct mtd_part *allocate_partition(struct mtd_info *master,
const struct mtd_partition *part, int partno,
uint64_t cur_offset)
@ -675,6 +649,48 @@ int mtd_add_partition(struct mtd_info *master, const char *name,
}
EXPORT_SYMBOL_GPL(mtd_add_partition);
/**
* __mtd_del_partition - delete MTD partition
*
* @priv: internal MTD struct for partition to be deleted
*
* This function must be called with the partitions mutex locked.
*/
static int __mtd_del_partition(struct mtd_part *priv)
{
int err;
err = del_mtd_device(&priv->mtd);
if (err)
return err;
list_del(&priv->list);
free_partition(priv);
return 0;
}
/*
* This function unregisters and destroy all slave MTD objects which are
* attached to the given master MTD object.
*/
int del_mtd_partitions(struct mtd_info *master)
{
struct mtd_part *slave, *next;
int ret, err = 0;
mutex_lock(&mtd_partitions_mutex);
list_for_each_entry_safe(slave, next, &mtd_partitions, list)
if (slave->master == master) {
ret = __mtd_del_partition(slave);
if (ret < 0)
err = ret;
}
mutex_unlock(&mtd_partitions_mutex);
return err;
}
int mtd_del_partition(struct mtd_info *master, int partno)
{
struct mtd_part *slave, *next;
@ -686,12 +702,7 @@ int mtd_del_partition(struct mtd_info *master, int partno)
(slave->mtd.index == partno)) {
sysfs_remove_files(&slave->mtd.dev.kobj,
mtd_partition_attrs);
ret = del_mtd_device(&slave->mtd);
if (ret < 0)
break;
list_del(&slave->list);
free_partition(slave);
ret = __mtd_del_partition(slave);
break;
}
mutex_unlock(&mtd_partitions_mutex);