diff options
Diffstat (limited to 'target/linux/generic/backport-4.9/065-v4.13-0006-mtd-partitions-add-support-for-subpartitions.patch')
| -rw-r--r-- | target/linux/generic/backport-4.9/065-v4.13-0006-mtd-partitions-add-support-for-subpartitions.patch | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/target/linux/generic/backport-4.9/065-v4.13-0006-mtd-partitions-add-support-for-subpartitions.patch b/target/linux/generic/backport-4.9/065-v4.13-0006-mtd-partitions-add-support-for-subpartitions.patch new file mode 100644 index 0000000000..0d3e10ac20 --- /dev/null +++ b/target/linux/generic/backport-4.9/065-v4.13-0006-mtd-partitions-add-support-for-subpartitions.patch @@ -0,0 +1,96 @@ +From 97519dc52b44af054d7654776e78eaa211cf1842 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl> +Date: Wed, 21 Jun 2017 08:26:45 +0200 +Subject: [PATCH] mtd: partitions: add support for subpartitions +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Some flash device partitions can be containers with extra subpartitions +(volumes). All callbacks are already capable of this additional level of +indirection. + +This patch makes sure we always display subpartitions using a tree +structure and takes care of deleting subpartitions when parent gets +removed. + +Signed-off-by: Rafał Miłecki <rafal@milecki.pl> +Signed-off-by: Brian Norris <computersforpeace@gmail.com> +--- + drivers/mtd/mtdpart.c | 23 ++++++++++++++++------- + 1 file changed, 16 insertions(+), 7 deletions(-) + +--- a/drivers/mtd/mtdpart.c ++++ b/drivers/mtd/mtdpart.c +@@ -413,7 +413,7 @@ static struct mtd_part *allocate_partiti + * parent conditional on that option. Note, this is a way to + * distinguish between the master and the partition in sysfs. + */ +- slave->mtd.dev.parent = IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER) ? ++ slave->mtd.dev.parent = IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER) || mtd_is_partition(parent) ? + &parent->dev : + parent->dev.parent; + slave->mtd.dev.of_node = part->of_node; +@@ -664,8 +664,17 @@ EXPORT_SYMBOL_GPL(mtd_add_partition); + */ + static int __mtd_del_partition(struct mtd_part *priv) + { ++ struct mtd_part *child, *next; + int err; + ++ list_for_each_entry_safe(child, next, &mtd_partitions, list) { ++ if (child->parent == &priv->mtd) { ++ err = __mtd_del_partition(child); ++ if (err) ++ return err; ++ } ++ } ++ + sysfs_remove_files(&priv->mtd.dev.kobj, mtd_partition_attrs); + + err = del_mtd_device(&priv->mtd); +@@ -680,16 +689,16 @@ static int __mtd_del_partition(struct mt + + /* + * This function unregisters and destroy all slave MTD objects which are +- * attached to the given master MTD object. ++ * attached to the given MTD object. + */ +-int del_mtd_partitions(struct mtd_info *master) ++int del_mtd_partitions(struct mtd_info *mtd) + { + 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->parent == master) { ++ if (slave->parent == mtd) { + ret = __mtd_del_partition(slave); + if (ret < 0) + err = ret; +@@ -699,14 +708,14 @@ int del_mtd_partitions(struct mtd_info * + return err; + } + +-int mtd_del_partition(struct mtd_info *master, int partno) ++int mtd_del_partition(struct mtd_info *mtd, int partno) + { + struct mtd_part *slave, *next; + int ret = -EINVAL; + + mutex_lock(&mtd_partitions_mutex); + list_for_each_entry_safe(slave, next, &mtd_partitions, list) +- if ((slave->parent == master) && ++ if ((slave->parent == mtd) && + (slave->mtd.index == partno)) { + ret = __mtd_del_partition(slave); + break; +@@ -939,6 +948,6 @@ uint64_t mtd_get_device_size(const struc + if (!mtd_is_partition(mtd)) + return mtd->size; + +- return mtd_to_part(mtd)->parent->size; ++ return mtd_get_device_size(mtd_to_part(mtd)->parent); + } + EXPORT_SYMBOL_GPL(mtd_get_device_size); |