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path: root/drivers/mtd/ubi
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Diffstat (limited to 'drivers/mtd/ubi')
-rw-r--r--drivers/mtd/ubi/block.c42
1 files changed, 26 insertions, 16 deletions
diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c
index ebf46ad2d513..b2fb0528c092 100644
--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -99,6 +99,8 @@ struct ubiblock {
/* Linked list of all ubiblock instances */
static LIST_HEAD(ubiblock_devices);
+static DEFINE_IDR(ubiblock_minor_idr);
+/* Protects ubiblock_devices and ubiblock_minor_idr */
static DEFINE_MUTEX(devices_mutex);
static int ubiblock_major;
@@ -354,8 +356,6 @@ static struct blk_mq_ops ubiblock_mq_ops = {
.map_queue = blk_mq_map_queue,
};
-static DEFINE_IDR(ubiblock_minor_idr);
-
int ubiblock_create(struct ubi_volume_info *vi)
{
struct ubiblock *dev;
@@ -368,14 +368,15 @@ int ubiblock_create(struct ubi_volume_info *vi)
/* Check that the volume isn't already handled */
mutex_lock(&devices_mutex);
if (find_dev_nolock(vi->ubi_num, vi->vol_id)) {
- mutex_unlock(&devices_mutex);
- return -EEXIST;
+ ret = -EEXIST;
+ goto out_unlock;
}
- mutex_unlock(&devices_mutex);
dev = kzalloc(sizeof(struct ubiblock), GFP_KERNEL);
- if (!dev)
- return -ENOMEM;
+ if (!dev) {
+ ret = -ENOMEM;
+ goto out_unlock;
+ }
mutex_init(&dev->dev_mutex);
@@ -440,14 +441,13 @@ int ubiblock_create(struct ubi_volume_info *vi)
goto out_free_queue;
}
- mutex_lock(&devices_mutex);
list_add_tail(&dev->list, &ubiblock_devices);
- mutex_unlock(&devices_mutex);
/* Must be the last step: anyone can call file ops from now on */
add_disk(dev->gd);
dev_info(disk_to_dev(dev->gd), "created from ubi%d:%d(%s)",
dev->ubi_num, dev->vol_id, vi->name);
+ mutex_unlock(&devices_mutex);
return 0;
out_free_queue:
@@ -460,6 +460,8 @@ out_put_disk:
put_disk(dev->gd);
out_free_dev:
kfree(dev);
+out_unlock:
+ mutex_unlock(&devices_mutex);
return ret;
}
@@ -481,30 +483,36 @@ static void ubiblock_cleanup(struct ubiblock *dev)
int ubiblock_remove(struct ubi_volume_info *vi)
{
struct ubiblock *dev;
+ int ret;
mutex_lock(&devices_mutex);
dev = find_dev_nolock(vi->ubi_num, vi->vol_id);
if (!dev) {
- mutex_unlock(&devices_mutex);
- return -ENODEV;
+ ret = -ENODEV;
+ goto out_unlock;
}
/* Found a device, let's lock it so we can check if it's busy */
mutex_lock(&dev->dev_mutex);
if (dev->refcnt > 0) {
- mutex_unlock(&dev->dev_mutex);
- mutex_unlock(&devices_mutex);
- return -EBUSY;
+ ret = -EBUSY;
+ goto out_unlock_dev;
}
/* Remove from device list */
list_del(&dev->list);
- mutex_unlock(&devices_mutex);
-
ubiblock_cleanup(dev);
mutex_unlock(&dev->dev_mutex);
+ mutex_unlock(&devices_mutex);
+
kfree(dev);
return 0;
+
+out_unlock_dev:
+ mutex_unlock(&dev->dev_mutex);
+out_unlock:
+ mutex_unlock(&devices_mutex);
+ return ret;
}
static int ubiblock_resize(struct ubi_volume_info *vi)
@@ -633,6 +641,7 @@ static void ubiblock_remove_all(void)
struct ubiblock *next;
struct ubiblock *dev;
+ mutex_lock(&devices_mutex);
list_for_each_entry_safe(dev, next, &ubiblock_devices, list) {
/* The module is being forcefully removed */
WARN_ON(dev->desc);
@@ -641,6 +650,7 @@ static void ubiblock_remove_all(void)
ubiblock_cleanup(dev);
kfree(dev);
}
+ mutex_unlock(&devices_mutex);
}
int __init ubiblock_init(void)