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xen/scsifront: use xenbus_setup_ring() and xenbus_teardown_ring()

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Simplify scsifront'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>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross 2022-04-28 09:01:04 +02:00
parent 0e6b139dbd
commit caa427d252
1 changed files with 7 additions and 21 deletions
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28
drivers/scsi/xen-scsifront.c
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@ -798,27 +798,15 @@ static int scsifront_alloc_ring(struct vscsifrnt_info *info)
{
struct xenbus_device *dev = info->dev;
struct vscsiif_sring *sring;
grant_ref_t gref;
int err = -ENOMEM;
int err;
/***** Frontend to Backend ring start *****/
sring = (struct vscsiif_sring *)__get_free_page(GFP_KERNEL);
if (!sring) {
xenbus_dev_fatal(dev, err,
"fail to allocate shared ring (Front to Back)");
err = xenbus_setup_ring(dev, GFP_KERNEL, (void **)&sring, 1,
&info->ring_ref);
if (err)
return err;
}
SHARED_RING_INIT(sring);
FRONT_RING_INIT(&info->ring, sring, PAGE_SIZE);
err = xenbus_grant_ring(dev, sring, 1, &gref);
if (err < 0) {
free_page((unsigned long)sring);
xenbus_dev_fatal(dev, err,
"fail to grant shared ring (Front to Back)");
return err;
}
info->ring_ref = gref;
XEN_FRONT_RING_INIT(&info->ring, sring, PAGE_SIZE);
err = xenbus_alloc_evtchn(dev, &info->evtchn);
if (err) {
@ -847,8 +835,7 @@ static int scsifront_alloc_ring(struct vscsifrnt_info *info)
free_irq:
unbind_from_irqhandler(info->irq, info);
free_gnttab:
gnttab_end_foreign_access(info->ring_ref,
(unsigned long)info->ring.sring);
xenbus_teardown_ring((void **)&sring, 1, &info->ring_ref);
return err;
}
@ -856,8 +843,7 @@ static int scsifront_alloc_ring(struct vscsifrnt_info *info)
static void scsifront_free_ring(struct vscsifrnt_info *info)
{
unbind_from_irqhandler(info->irq, info);
gnttab_end_foreign_access(info->ring_ref,
(unsigned long)info->ring.sring);
xenbus_teardown_ring((void **)&info->ring.sring, 1, &info->ring_ref);
}
static int scsifront_init_ring(struct vscsifrnt_info *info)