[src/trunk]: src/sys/dev/pci virtio(4): change variable name, nfc

[yamaguchi <yamaguchi%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/f5ccbf597573
branches:  trunk
changeset: 374332:f5ccbf597573
user:      yamaguchi <yamaguchi%NetBSD.org@localhost>
date:      Wed Apr 19 00:40:30 2023 +0000

description:
virtio(4): change variable name, nfc

diffstat:

 sys/dev/pci/virtio.c |  12 +++++-------
 1 files changed, 5 insertions(+), 7 deletions(-)

diffs (48 lines):

diff -r 1ee9362c5a1a -r f5ccbf597573 sys/dev/pci/virtio.c
--- a/sys/dev/pci/virtio.c      Wed Apr 19 00:38:30 2023 +0000
+++ b/sys/dev/pci/virtio.c      Wed Apr 19 00:40:30 2023 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: virtio.c,v 1.76 2023/04/19 00:38:30 yamaguchi Exp $    */
+/*     $NetBSD: virtio.c,v 1.77 2023/04/19 00:40:30 yamaguchi Exp $    */
 
 /*
  * Copyright (c) 2020 The NetBSD Foundation, Inc.
@@ -28,7 +28,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: virtio.c,v 1.76 2023/04/19 00:38:30 yamaguchi Exp $");
+__KERNEL_RCSID(0, "$NetBSD: virtio.c,v 1.77 2023/04/19 00:40:30 yamaguchi Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -944,12 +944,12 @@ vq_alloc_slot_locked(struct virtio_softc
     size_t nslots)
 {
        struct vring_desc *vd;
-       uint16_t rv, tail;
+       uint16_t head, tail;
        size_t i;
 
        KASSERT(mutex_owned(&vq->vq_freedesc_lock));
 
-       tail = virtio_rw16(sc, vq->vq_free_idx);
+       head = tail = virtio_rw16(sc, vq->vq_free_idx);
        for (i = 0; i < nslots - 1; i++) {
                if (tail == VRING_DESC_CHAIN_END)
                        return VRING_DESC_CHAIN_END;
@@ -962,13 +962,11 @@ vq_alloc_slot_locked(struct virtio_softc
        if (tail == VRING_DESC_CHAIN_END)
                return VRING_DESC_CHAIN_END;
 
-       rv = virtio_rw16(sc, vq->vq_free_idx);
-
        vd = &vq->vq_desc[tail];
        vd->flags = virtio_rw16(sc, 0);
        vq->vq_free_idx = vd->next;
 
-       return rv;
+       return head;
 }
 static uint16_t
 vq_alloc_slot(struct virtio_softc *sc, struct virtqueue *vq, size_t nslots)