diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 3405be46ebe9..ba01a8d22d28 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -923,7 +923,7 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
 
 		/* Make sure ubi_num is not busy */
 		if (ubi_devices[ubi_num]) {
-			ubi_err(ubi, "ubi%d already exists", ubi_num);
+			ubi_err(ubi, "already exists");
 			return -EEXIST;
 		}
 	}
@@ -973,7 +973,7 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
 	mutex_init(&ubi->fm_mutex);
 	init_rwsem(&ubi->fm_sem);
 
-	ubi_msg(ubi, "attaching mtd%d to ubi%d", mtd->index, ubi_num);
+	ubi_msg(ubi, "attaching mtd%d", mtd->index);
 
 	err = io_init(ubi, max_beb_per1024);
 	if (err)
@@ -1428,7 +1428,7 @@ static int __init ubi_mtd_param_parse(const char *val, struct kernel_param *kp)
 	}
 
 	if (len == 0) {
-		pr_err("UBI warning: empty 'mtd=' parameter - ignored\n");
+		pr_warn("UBI warning: empty 'mtd=' parameter - ignored\n");
 		return 0;
 	}
 
diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index 286383c11126..d647e504f9b1 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -48,14 +48,13 @@
 
 /**
  * get_exclusive - get exclusive access to an UBI volume.
- * @ubi: UBI device description object
  * @desc: volume descriptor
  *
  * This function changes UBI volume open mode to "exclusive". Returns previous
  * mode value (positive integer) in case of success and a negative error code
  * in case of failure.
  */
-static int get_exclusive(struct ubi_device *ubi, struct ubi_volume_desc *desc)
+static int get_exclusive(struct ubi_volume_desc *desc)
 {
 	int users, err;
 	struct ubi_volume *vol = desc->vol;
@@ -64,7 +63,7 @@ static int get_exclusive(struct ubi_device *ubi, struct ubi_volume_desc *desc)
 	users = vol->readers + vol->writers + vol->exclusive + vol->metaonly;
 	ubi_assert(users > 0);
 	if (users > 1) {
-		ubi_err(ubi, "%d users for volume %d", users, vol->vol_id);
+		ubi_err(vol->ubi, "%d users for volume %d", users, vol->vol_id);
 		err = -EBUSY;
 	} else {
 		vol->readers = vol->writers = vol->metaonly = 0;
@@ -423,7 +422,7 @@ static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
 			break;
 		}
 
-		err = get_exclusive(ubi, desc);
+		err = get_exclusive(desc);
 		if (err < 0)
 			break;
 
@@ -459,7 +458,7 @@ static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
 		    req.bytes < 0 || req.lnum >= vol->usable_leb_size)
 			break;
 
-		err = get_exclusive(ubi, desc);
+		err = get_exclusive(desc);
 		if (err < 0)
 			break;
 
diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
index 396aaa543362..ed0bcb35472f 100644
--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -1419,8 +1419,7 @@ int ubi_self_check_all_ff(struct ubi_device *ubi, int pnum, int offset, int len)
 
 fail:
 	ubi_err(ubi, "self-check failed for PEB %d", pnum);
-	ubi_msg(ubi, "hex dump of the %d-%d region",
-		 offset, offset + len);
+	ubi_msg(ubi, "hex dump of the %d-%d region", offset, offset + len);
 	print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, buf, len, 1);
 	err = -EINVAL;
 error:
diff --git a/drivers/mtd/ubi/vtbl.c b/drivers/mtd/ubi/vtbl.c
index f8fc3081bbb4..68c9c5ea676f 100644
--- a/drivers/mtd/ubi/vtbl.c
+++ b/drivers/mtd/ubi/vtbl.c
@@ -655,14 +655,13 @@ static int init_volumes(struct ubi_device *ubi,
 
 /**
  * check_av - check volume attaching information.
- * @ubi: UBI device description object
  * @vol: UBI volume description object
  * @av: volume attaching information
  *
  * This function returns zero if the volume attaching information is consistent
  * to the data read from the volume tabla, and %-EINVAL if not.
  */
-static int check_av(const struct ubi_device *ubi, const struct ubi_volume *vol,
+static int check_av(const struct ubi_volume *vol,
 		    const struct ubi_ainf_volume *av)
 {
 	int err;
@@ -690,7 +689,7 @@ static int check_av(const struct ubi_device *ubi, const struct ubi_volume *vol,
 	return 0;
 
 bad:
-	ubi_err(ubi, "bad attaching information, error %d", err);
+	ubi_err(vol->ubi, "bad attaching information, error %d", err);
 	ubi_dump_av(av);
 	ubi_dump_vol_info(vol);
 	return -EINVAL;
@@ -753,7 +752,7 @@ static int check_attaching_info(const struct ubi_device *ubi,
 			ubi_msg(ubi, "finish volume %d removal", av->vol_id);
 			ubi_remove_av(ai, av);
 		} else if (av) {
-			err = check_av(ubi, vol, av);
+			err = check_av(vol, av);
 			if (err)
 				return err;
 		}
diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
index 834f6fe1f5fa..8f7bde6a85d6 100644
--- a/drivers/mtd/ubi/wl.c
+++ b/drivers/mtd/ubi/wl.c
@@ -470,11 +470,8 @@ struct ubi_wl_entry *ubi_wl_get_fm_peb(struct ubi_device *ubi, int anchor)
 {
 	struct ubi_wl_entry *e = NULL;
 
-	if (!ubi->free.rb_node || (ubi->free_count - ubi->beb_rsvd_pebs < 1)) {
-		ubi_warn(ubi, "Can't get peb for fastmap:anchor=%d, free_cnt=%d, reserved=%d",
-			 anchor, ubi->free_count, ubi->beb_rsvd_pebs);
+	if (!ubi->free.rb_node || (ubi->free_count - ubi->beb_rsvd_pebs < 1))
 		goto out;
-	}
 
 	if (anchor)
 		e = find_anchor_wl_entry(&ubi->free);
@@ -1806,11 +1803,8 @@ int ubi_thread(void *u)
 	for (;;) {
 		int err;
 
-		if (kthread_should_stop()) {
-			ubi_msg(ubi, "background thread \"%s\" should stop, PID %d",
-				ubi->bgt_name, task_pid_nr(current));
+		if (kthread_should_stop())
 			break;
-		}
 
 		if (try_to_freeze())
 			continue;