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Commit 40e4d0c1 authored by Artem Bityutskiy's avatar Artem Bityutskiy
Browse files

UBI: tweak volumes locking some more 



Make the code more consistent by requiring the caller to lock the
ubi->volume_mutex, because this is what we do for updates.

Signed-off-by: default avatarArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
parent d05c77a8

drivers/mtd/ubi/cdev.c

+10 −3
Original line number Diff line number Diff line
@@ -605,7 +605,9 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file, 


		req.name[req.name_len] = '\0';



		mutex_lock(&ubi->volumes_mutex);

		err = ubi_create_volume(ubi, &req);

		mutex_unlock(&ubi->volumes_mutex);

		if (err)

			break;
@@ -634,11 +636,14 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file, 
			break;

		}



		mutex_lock(&ubi->volumes_mutex);

		err = ubi_remove_volume(desc);

		mutex_unlock(&ubi->volumes_mutex);



		/*

		 * The volume is deleted, and the 'struct ubi_volume' object

		 * will be freed when 'ubi_close_volume()' will call

		 * 'put_device()'.

		 * The volume is deleted (unless an error occurred), and the

		 * 'struct ubi_volume' object will be freed when

		 * 'ubi_close_volume()' will call 'put_device()'.

		 */

		ubi_close_volume(desc);

		break;
@@ -673,7 +678,9 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file, 
		pebs = !!do_div(tmp, desc->vol->usable_leb_size);

		pebs += tmp;



		mutex_lock(&ubi->volumes_mutex);

		err = ubi_resize_volume(desc, pebs);

		mutex_unlock(&ubi->volumes_mutex);

		ubi_close_volume(desc);

		break;

	}

drivers/mtd/ubi/vmt.c

+7 −13
Original line number Diff line number Diff line
@@ -189,7 +189,8 @@ static void volume_sysfs_close(struct ubi_volume *vol) 
 * This function creates volume described by @req. If @req->vol_id id

 * %UBI_VOL_NUM_AUTO, this function automatically assign ID to the new volume

 * and saves it in @req->vol_id. Returns zero in case of success and a negative

 * error code in case of failure.

 * error code in case of failure. Note, the caller has to have the

 * @ubi->volumes_mutex locked.

 */

int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)

{
@@ -206,7 +207,6 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req) 
	if (!vol)

		return -ENOMEM;



	mutex_lock(&ubi->volumes_mutex);

	spin_lock(&ubi->volumes_lock);

	if (vol_id == UBI_VOL_NUM_AUTO) {

		/* Find unused volume ID */
@@ -356,7 +356,6 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req) 
	spin_unlock(&ubi->volumes_lock);



	paranoid_check_volumes(ubi);

	mutex_unlock(&ubi->volumes_mutex);

	return 0;



out_sysfs:
@@ -383,7 +382,6 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req) 
	ubi->avail_pebs += vol->reserved_pebs;

out_unlock:

	spin_unlock(&ubi->volumes_lock);

	mutex_unlock(&ubi->volumes_mutex);

	if (dont_free)

		put_device(&vol->dev);

	else
@@ -398,7 +396,8 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req) 
 *

 * This function removes volume described by @desc. The volume has to be opened

 * in "exclusive" mode. Returns zero in case of success and a negative error

 * code in case of failure.

 * code in case of failure. The caller has to have the @ubi->volumes_mutex

 * locked.

 */

int ubi_remove_volume(struct ubi_volume_desc *desc)

{
@@ -413,7 +412,6 @@ int ubi_remove_volume(struct ubi_volume_desc *desc) 
	if (ubi->ro_mode)

		return -EROFS;



	mutex_lock(&ubi->volumes_mutex);

	spin_lock(&ubi->volumes_lock);

	if (vol->ref_count > 1) {

		/*
@@ -461,7 +459,6 @@ int ubi_remove_volume(struct ubi_volume_desc *desc) 
	spin_unlock(&ubi->volumes_lock);



	paranoid_check_volumes(ubi);

	mutex_unlock(&ubi->volumes_mutex);

	return 0;



out_err:
@@ -470,7 +467,6 @@ int ubi_remove_volume(struct ubi_volume_desc *desc) 
	ubi->volumes[vol_id] = vol;

out_unlock:

	spin_unlock(&ubi->volumes_lock);

	mutex_unlock(&ubi->volumes_mutex);

	return err;

}
@@ -479,8 +475,9 @@ int ubi_remove_volume(struct ubi_volume_desc *desc) 
 * @desc: volume descriptor

 * @reserved_pebs: new size in physical eraseblocks

 *

 * This function returns zero in case of success, and a negative error code in

 * case of failure.

 * This function re-sizes the volume and returns zero in case of success, and a

 * negative error code in case of failure. The caller has to have the

 * @ubi->volumes_mutex locked.

 */

int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)

{
@@ -516,7 +513,6 @@ int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs) 
	for (i = 0; i < reserved_pebs; i++)

		new_mapping[i] = UBI_LEB_UNMAPPED;



	mutex_lock(&ubi->volumes_mutex);

	spin_lock(&ubi->volumes_lock);

	if (vol->ref_count > 1) {

		spin_unlock(&ubi->volumes_lock);
@@ -587,7 +583,6 @@ int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs) 
	}



	paranoid_check_volumes(ubi);

	mutex_unlock(&ubi->volumes_mutex);

	return 0;



out_acc:
@@ -599,7 +594,6 @@ int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs) 
	}

out_free:

	kfree(new_mapping);

	mutex_unlock(&ubi->volumes_mutex);

	return err;

}