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Commit 35ad5fb7 authored by Artem Bityutskiy's avatar Artem Bityutskiy
Browse files

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: default avatarArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
parent fc75a1e1

drivers/mtd/ubi/kapi.c

+25 −36
Original line number Diff line number Diff line
@@ -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);



	ubi = ubi_devices[ubi_num];

	if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES)

		return ERR_PTR(-EINVAL);



	if (!try_module_get(THIS_MODULE))

		return ERR_PTR(err);

	if (mode != UBI_READONLY && mode != UBI_READWRITE &&

	    mode != UBI_EXCLUSIVE)

		return ERR_PTR(-EINVAL);



	if (ubi_num >= UBI_MAX_DEVICES || !ubi)

		goto out_put;

	ubi = ubi_devices[ubi_num];

	if (!ubi)

		return ERR_PTR(-ENODEV);



	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);



	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;



	ret = ubi_open_volume(ubi_num, vol_id, mode);

		return ERR_PTR(-ENODEV);



out_put:

	module_put(THIS_MODULE);

	return ret;

	return ubi_open_volume(ubi_num, vol_id, mode);

}

EXPORT_SYMBOL_GPL(ubi_open_volume_nm);