diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index 3164e31779657eeb93870010281f71c622d66a6b..3067b75f3fd0abdf6d5663827114b9194adb257a 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -5524,16 +5524,16 @@ bfq_set_next_ioprio_data(struct bfq_queue *bfqq, struct bfq_io_cq *bic)
 		bfqq->new_ioprio_class = task_nice_ioclass(tsk);
 		break;
 	case IOPRIO_CLASS_RT:
-		bfqq->new_ioprio = IOPRIO_PRIO_DATA(bic->ioprio);
+		bfqq->new_ioprio = IOPRIO_PRIO_LEVEL(bic->ioprio);
 		bfqq->new_ioprio_class = IOPRIO_CLASS_RT;
 		break;
 	case IOPRIO_CLASS_BE:
-		bfqq->new_ioprio = IOPRIO_PRIO_DATA(bic->ioprio);
+		bfqq->new_ioprio = IOPRIO_PRIO_LEVEL(bic->ioprio);
 		bfqq->new_ioprio_class = IOPRIO_CLASS_BE;
 		break;
 	case IOPRIO_CLASS_IDLE:
 		bfqq->new_ioprio_class = IOPRIO_CLASS_IDLE;
-		bfqq->new_ioprio = 7;
+		bfqq->new_ioprio = IOPRIO_NR_LEVELS - 1;
 		break;
 	}
 
@@ -5830,7 +5830,7 @@ static struct bfq_queue *bfq_get_queue(struct bfq_data *bfqd,
 				       struct bfq_io_cq *bic,
 				       bool respawn)
 {
-	const int ioprio = IOPRIO_PRIO_DATA(bic->ioprio);
+	const int ioprio = IOPRIO_PRIO_LEVEL(bic->ioprio);
 	const int ioprio_class = IOPRIO_PRIO_CLASS(bic->ioprio);
 	struct bfq_queue **async_bfqq = NULL;
 	struct bfq_queue *bfqq;
diff --git a/block/ioprio.c b/block/ioprio.c
index 32a456b458049f45baf30be663cdfe63bcde2a55..f0d9e818abc5358b1ff6b2c0655fba2edcac683d 100644
--- a/block/ioprio.c
+++ b/block/ioprio.c
@@ -33,7 +33,7 @@
 int ioprio_check_cap(int ioprio)
 {
 	int class = IOPRIO_PRIO_CLASS(ioprio);
-	int data = IOPRIO_PRIO_DATA(ioprio);
+	int level = IOPRIO_PRIO_LEVEL(ioprio);
 
 	switch (class) {
 		case IOPRIO_CLASS_RT:
@@ -49,13 +49,13 @@ int ioprio_check_cap(int ioprio)
 			fallthrough;
 			/* rt has prio field too */
 		case IOPRIO_CLASS_BE:
-			if (data >= IOPRIO_NR_LEVELS || data < 0)
+			if (level >= IOPRIO_NR_LEVELS)
 				return -EINVAL;
 			break;
 		case IOPRIO_CLASS_IDLE:
 			break;
 		case IOPRIO_CLASS_NONE:
-			if (data)
+			if (level)
 				return -EINVAL;
 			break;
 		default:
diff --git a/include/uapi/linux/ioprio.h b/include/uapi/linux/ioprio.h
index f70f2596a6bf7f54f6fffba8fe3eb35002017075..4444b4e4fdad974ecdd96bcee442e1273baf464d 100644
--- a/include/uapi/linux/ioprio.h
+++ b/include/uapi/linux/ioprio.h
@@ -17,7 +17,7 @@
 	 ((data) & IOPRIO_PRIO_MASK))
 
 /*
- * These are the io priority groups as implemented by the BFQ and mq-deadline
+ * These are the io priority classes as implemented by the BFQ and mq-deadline
  * schedulers. RT is the realtime class, it always gets premium service. For
  * ATA disks supporting NCQ IO priority, RT class IOs will be processed using
  * high priority NCQ commands. BE is the best-effort scheduling class, the
@@ -32,11 +32,20 @@ enum {
 };
 
 /*
- * The RT and BE priority classes both support up to 8 priority levels.
+ * The RT and BE priority classes both support up to 8 priority levels that
+ * can be specified using the lower 3-bits of the priority data.
  */
-#define IOPRIO_NR_LEVELS	8
-#define IOPRIO_BE_NR		IOPRIO_NR_LEVELS
+#define IOPRIO_LEVEL_NR_BITS		3
+#define IOPRIO_NR_LEVELS		(1 << IOPRIO_LEVEL_NR_BITS)
+#define IOPRIO_LEVEL_MASK		(IOPRIO_NR_LEVELS - 1)
+#define IOPRIO_PRIO_LEVEL(ioprio)	((ioprio) & IOPRIO_LEVEL_MASK)
 
+#define IOPRIO_BE_NR			IOPRIO_NR_LEVELS
+
+/*
+ * Possible values for the "which" argument of the ioprio_get() and
+ * ioprio_set() system calls (see "man ioprio_set").
+ */
 enum {
 	IOPRIO_WHO_PROCESS = 1,
 	IOPRIO_WHO_PGRP,
@@ -44,7 +53,7 @@ enum {
 };
 
 /*
- * Fallback BE priority level.
+ * Fallback BE class priority level.
  */
 #define IOPRIO_NORM	4
 #define IOPRIO_BE_NORM	IOPRIO_NORM