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

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Simplify tpmfront's ring creation and removal via xenbus_setup_ring()
and xenbus_teardown_ring(), which are provided exactly for the use
pattern as seen in this driver.

Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross 2022-04-28 09:01:04 +02:00
parent 46e20d43f5
commit 5e0afd8eab
1 changed files with 3 additions and 15 deletions
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18
drivers/char/tpm/xen-tpmfront.c
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@ -253,20 +253,12 @@ static int setup_ring(struct xenbus_device *dev, struct tpm_private *priv)
struct xenbus_transaction xbt;
const char *message = NULL;
int rv;
grant_ref_t gref;
priv->shr = (void *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
if (!priv->shr) {
xenbus_dev_fatal(dev, -ENOMEM, "allocating shared ring");
return -ENOMEM;
}
rv = xenbus_grant_ring(dev, priv->shr, 1, &gref);
rv = xenbus_setup_ring(dev, GFP_KERNEL, (void **)&priv->shr, 1,
&priv->ring_ref);
if (rv < 0)
return rv;
priv->ring_ref = gref;
rv = xenbus_alloc_evtchn(dev, &priv->evtchn);
if (rv)
return rv;
@ -331,11 +323,7 @@ static void ring_free(struct tpm_private *priv)
if (!priv)
return;
if (priv->ring_ref)
gnttab_end_foreign_access(priv->ring_ref,
(unsigned long)priv->shr);
else
free_page((unsigned long)priv->shr);
xenbus_teardown_ring((void **)&priv->shr, 1, &priv->ring_ref);
if (priv->irq)
unbind_from_irqhandler(priv->irq, priv);