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OpenCloudOS-Kernel
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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>
This commit is contained in:
Artem Bityutskiy 2007-12-17 14:22:55 +02:00
parent fc75a1e166
commit 35ad5fb76c
1 changed files with 26 additions and 37 deletions
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63
drivers/mtd/ubi/kapi.c
View File

@ -104,37 +104,32 @@ struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode)
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 @@ struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode)
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 @@ struct ubi_volume_desc *ubi_open_volume_nm(int ubi_num, const char *name,
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 @@ struct ubi_volume_desc *ubi_open_volume_nm(int ubi_num, const char *name,
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 @@ struct ubi_volume_desc *ubi_open_volume_nm(int ubi_num, const char *name,
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);