UBI: fix and cleanup volume opening functions
This patch fixes error codes of the functions - if the device number
is out of range, -EINVAL should be returned. It also removes unneeded
try_module_get call from the open by name function.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/drivers/mtd/ubi/kapi.c b/drivers/mtd/ubi/kapi.c
index 96f5fef..9c28376 100644
--- a/drivers/mtd/ubi/kapi.c
+++ b/drivers/mtd/ubi/kapi.c
@@ -104,37 +104,32 @@
dbg_msg("open device %d volume %d, mode %d", ubi_num, vol_id, mode);
- err = -ENODEV;
- if (ubi_num < 0)
- return ERR_PTR(err);
+ if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES)
+ return ERR_PTR(-EINVAL);
- ubi = ubi_devices[ubi_num];
-
- if (!try_module_get(THIS_MODULE))
- return ERR_PTR(err);
-
- if (ubi_num >= UBI_MAX_DEVICES || !ubi)
- goto out_put;
-
- err = -EINVAL;
- if (vol_id < 0 || vol_id >= ubi->vtbl_slots)
- goto out_put;
if (mode != UBI_READONLY && mode != UBI_READWRITE &&
mode != UBI_EXCLUSIVE)
- goto out_put;
+ return ERR_PTR(-EINVAL);
+
+ ubi = ubi_devices[ubi_num];
+ if (!ubi)
+ return ERR_PTR(-ENODEV);
+
+ if (vol_id < 0 || vol_id >= ubi->vtbl_slots)
+ return ERR_PTR(-EINVAL);
desc = kmalloc(sizeof(struct ubi_volume_desc), GFP_KERNEL);
- if (!desc) {
- err = -ENOMEM;
- goto out_put;
- }
+ if (!desc)
+ return ERR_PTR(-ENOMEM);
+
+ err = -ENODEV;
+ if (!try_module_get(THIS_MODULE))
+ goto out_free;
spin_lock(&ubi->volumes_lock);
vol = ubi->volumes[vol_id];
- if (!vol) {
- err = -ENODEV;
+ if (!vol)
goto out_unlock;
- }
err = -EBUSY;
switch (mode) {
@@ -184,13 +179,14 @@
vol->checked = 1;
}
mutex_unlock(&ubi->volumes_mutex);
+
return desc;
out_unlock:
spin_unlock(&ubi->volumes_lock);
- kfree(desc);
-out_put:
module_put(THIS_MODULE);
+out_free:
+ kfree(desc);
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(ubi_open_volume);
@@ -207,7 +203,6 @@
int mode)
{
int i, vol_id = -1, len;
- struct ubi_volume_desc *ret;
struct ubi_device *ubi;
dbg_msg("open volume %s, mode %d", name, mode);
@@ -219,14 +214,12 @@
if (len > UBI_VOL_NAME_MAX)
return ERR_PTR(-EINVAL);
- ret = ERR_PTR(-ENODEV);
- if (!try_module_get(THIS_MODULE))
- return ret;
-
- if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES || !ubi_devices[ubi_num])
- goto out_put;
+ if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES)
+ return ERR_PTR(-EINVAL);
ubi = ubi_devices[ubi_num];
+ if (!ubi)
+ return ERR_PTR(-ENODEV);
spin_lock(&ubi->volumes_lock);
/* Walk all volumes of this UBI device */
@@ -241,13 +234,9 @@
spin_unlock(&ubi->volumes_lock);
if (vol_id < 0)
- goto out_put;
+ return ERR_PTR(-ENODEV);
- ret = ubi_open_volume(ubi_num, vol_id, mode);
-
-out_put:
- module_put(THIS_MODULE);
- return ret;
+ return ubi_open_volume(ubi_num, vol_id, mode);
}
EXPORT_SYMBOL_GPL(ubi_open_volume_nm);