diff options
| author |   Juergen Gross <jgross@suse.com> | 2022-04-28 09:01:03 +0200 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2022-05-19 14:21:56 +0200 |
| commit | 47cbd5983347d41b1c41a632b1e45a660a351c68 (patch) | |
| tree | 978002585addbeb930b5890be4a5a5d361e05994 /drivers/block/xen-blkfront.c | |
| parent | xen/xenbus: add xenbus_setup_ring() service function (diff) | |
| download | linux-dev-47cbd5983347d41b1c41a632b1e45a660a351c68.tar.xz linux-dev-47cbd5983347d41b1c41a632b1e45a660a351c68.zip | |
xen/blkfront: use xenbus_setup_ring() and xenbus_teardown_ring()
Simplify blkfront's ring creation and removal via xenbus_setup_ring()
and xenbus_teardown_ring().
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'drivers/block/xen-blkfront.c')
| -rw-r--r-- | drivers/block/xen-blkfront.c | 37 |
1 files changed, 8 insertions, 29 deletions
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 7f35e30e626a..bd7b34f29193 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -1280,15 +1280,8 @@ free_shadow: flush_work(&rinfo->work); /* Free resources associated with old device channel. */ - for (i = 0; i < info->nr_ring_pages; i++) { - if (rinfo->ring_ref[i] != INVALID_GRANT_REF) { - gnttab_end_foreign_access(rinfo->ring_ref[i], 0); - rinfo->ring_ref[i] = INVALID_GRANT_REF; - } - } - free_pages_exact(rinfo->ring.sring, - info->nr_ring_pages * XEN_PAGE_SIZE); - rinfo->ring.sring = NULL; + xenbus_teardown_ring((void **)&rinfo->ring.sring, info->nr_ring_pages, + rinfo->ring_ref); if (rinfo->irq) unbind_from_irqhandler(rinfo->irq, rinfo); @@ -1679,30 +1672,16 @@ static int setup_blkring(struct xenbus_device *dev, struct blkfront_ring_info *rinfo) { struct blkif_sring *sring; - int err, i; + int err; struct blkfront_info *info = rinfo->dev_info; unsigned long ring_size = info->nr_ring_pages * XEN_PAGE_SIZE; - grant_ref_t gref[XENBUS_MAX_RING_GRANTS]; - - for (i = 0; i < info->nr_ring_pages; i++) - rinfo->ring_ref[i] = INVALID_GRANT_REF; - sring = alloc_pages_exact(ring_size, GFP_NOIO); - if (!sring) { - xenbus_dev_fatal(dev, -ENOMEM, "allocating shared ring"); - return -ENOMEM; - } - SHARED_RING_INIT(sring); - FRONT_RING_INIT(&rinfo->ring, sring, ring_size); - - err = xenbus_grant_ring(dev, rinfo->ring.sring, info->nr_ring_pages, gref); - if (err < 0) { - free_pages_exact(sring, ring_size); - rinfo->ring.sring = NULL; + err = xenbus_setup_ring(dev, GFP_NOIO, (void **)&sring, + info->nr_ring_pages, rinfo->ring_ref); + if (err) goto fail; - } - for (i = 0; i < info->nr_ring_pages; i++) - rinfo->ring_ref[i] = gref[i]; + + XEN_FRONT_RING_INIT(&rinfo->ring, sring, ring_size); err = xenbus_alloc_evtchn(dev, &rinfo->evtchn); if (err) |