* @ubi_num: UBI device number
* @di: the information is stored here
*
- * This function returns %0 in case of success and a %-ENODEV if there is no
- * such UBI device.
+ * This function returns %0 in case of success, %-EINVAL if the UBI device
+ * number is invalid, and %-ENODEV if there is no such UBI device.
*/
int ubi_get_device_info(int ubi_num, struct ubi_device_info *di)
{
- const struct ubi_device *ubi;
+ struct ubi_device *ubi;
+
+ if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES)
+ return -EINVAL;
- if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES ||
- !ubi_devices[ubi_num])
+ ubi = ubi_get_device(ubi_num);
+ if (!ubi)
return -ENODEV;
- ubi = ubi_devices[ubi_num];
di->ubi_num = ubi->ubi_num;
di->leb_size = ubi->leb_size;
di->min_io_size = ubi->min_io_size;
di->ro_mode = ubi->ro_mode;
di->cdev = ubi->cdev.dev;
+
+ ubi_put_device(ubi);
return 0;
}
EXPORT_SYMBOL_GPL(ubi_get_device_info);
dbg_msg("open device %d volume %d, mode %d", ubi_num, vol_id, mode);
- err = -ENODEV;
- if (ubi_num < 0)
- return ERR_PTR(err);
-
- 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;
+ if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES)
+ return ERR_PTR(-EINVAL);
- 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);
+
+ /*
+ * First of all, we have to get the UBI device to prevent its removal.
+ */
+ ubi = ubi_get_device(ubi_num);
+ if (!ubi)
+ return ERR_PTR(-ENODEV);
+
+ if (vol_id < 0 || vol_id >= ubi->vtbl_slots) {
+ err = -EINVAL;
+ goto out_put_ubi;
+ }
desc = kmalloc(sizeof(struct ubi_volume_desc), GFP_KERNEL);
if (!desc) {
err = -ENOMEM;
- goto out_put;
+ goto out_put_ubi;
}
+ 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) {
vol->exclusive = 1;
break;
}
+ get_device(&vol->dev);
+ vol->ref_count += 1;
spin_unlock(&ubi->volumes_lock);
desc->vol = vol;
desc->mode = mode;
- /*
- * To prevent simultaneous checks of the same volume we use @vtbl_mutex,
- * although it is not the purpose it was introduced for.
- */
- mutex_lock(&ubi->vtbl_mutex);
+ mutex_lock(&ubi->ckvol_mutex);
if (!vol->checked) {
/* This is the first open - check the volume */
err = ubi_check_volume(ubi, vol_id);
if (err < 0) {
- mutex_unlock(&ubi->vtbl_mutex);
+ mutex_unlock(&ubi->ckvol_mutex);
ubi_close_volume(desc);
return ERR_PTR(err);
}
}
vol->checked = 1;
}
- mutex_unlock(&ubi->vtbl_mutex);
+ mutex_unlock(&ubi->ckvol_mutex);
+
return desc;
out_unlock:
spin_unlock(&ubi->volumes_lock);
- kfree(desc);
-out_put:
module_put(THIS_MODULE);
+out_free:
+ kfree(desc);
+out_put_ubi:
+ ubi_put_device(ubi);
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(ubi_open_volume);
int mode)
{
int i, vol_id = -1, len;
- struct ubi_volume_desc *ret;
struct ubi_device *ubi;
+ struct ubi_volume_desc *ret;
dbg_msg("open volume %s, mode %d", name, mode);
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];
+ ubi = ubi_get_device(ubi_num);
+ if (!ubi)
+ return ERR_PTR(-ENODEV);
spin_lock(&ubi->volumes_lock);
/* Walk all volumes of this UBI device */
}
spin_unlock(&ubi->volumes_lock);
- if (vol_id < 0)
- goto out_put;
-
- ret = ubi_open_volume(ubi_num, vol_id, mode);
+ if (vol_id >= 0)
+ ret = ubi_open_volume(ubi_num, vol_id, mode);
+ else
+ ret = ERR_PTR(-ENODEV);
-out_put:
- module_put(THIS_MODULE);
+ /*
+ * We should put the UBI device even in case of success, because
+ * 'ubi_open_volume()' took a reference as well.
+ */
+ ubi_put_device(ubi);
return ret;
}
EXPORT_SYMBOL_GPL(ubi_open_volume_nm);
void ubi_close_volume(struct ubi_volume_desc *desc)
{
struct ubi_volume *vol = desc->vol;
+ struct ubi_device *ubi = vol->ubi;
dbg_msg("close volume %d, mode %d", vol->vol_id, desc->mode);
- spin_lock(&vol->ubi->volumes_lock);
+ spin_lock(&ubi->volumes_lock);
switch (desc->mode) {
case UBI_READONLY:
vol->readers -= 1;
case UBI_EXCLUSIVE:
vol->exclusive = 0;
}
- spin_unlock(&vol->ubi->volumes_lock);
+ vol->ref_count -= 1;
+ spin_unlock(&ubi->volumes_lock);
kfree(desc);
+ put_device(&vol->dev);
+ ubi_put_device(ubi);
module_put(THIS_MODULE);
}
EXPORT_SYMBOL_GPL(ubi_close_volume);
{
struct ubi_volume *vol = desc->vol;
struct ubi_device *ubi = vol->ubi;
- int err, vol_id = vol->vol_id;
+ int err;
- dbg_msg("erase LEB %d:%d", vol_id, lnum);
+ dbg_msg("erase LEB %d:%d", vol->vol_id, lnum);
if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME)
return -EROFS;
{
struct ubi_volume *vol = desc->vol;
struct ubi_device *ubi = vol->ubi;
- int vol_id = vol->vol_id;
- dbg_msg("unmap LEB %d:%d", vol_id, lnum);
+ dbg_msg("unmap LEB %d:%d", vol->vol_id, lnum);
if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME)
return -EROFS;
{
struct ubi_volume *vol = desc->vol;
struct ubi_device *ubi = vol->ubi;
- int vol_id = vol->vol_id;
- dbg_msg("unmap LEB %d:%d", vol_id, lnum);
+ dbg_msg("unmap LEB %d:%d", vol->vol_id, lnum);
if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME)
return -EROFS;
projects / linux-2.6 / blobdiff