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xen: make use of xenbus_read_unsigned() in xenbus

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Use xenbus_read_unsigned() instead of xenbus_scanf() when possible.
This requires to change the type of the reads from int to unsigned,
but these cases have been wrong before: negative values are not allowed
for the modified cases.

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
Juergen Gross 2016-10-31 14:58:42 +01:00
parent 4e81f1caa7
commit 999c9af9e3
2 changed files with 4 additions and 11 deletions
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8
drivers/xen/xenbus/xenbus_probe_backend.c
View file

@ -224,13 +224,7 @@ static int read_frontend_details(struct xenbus_device *xendev)
int xenbus_dev_is_online(struct xenbus_device *dev)
{
int rc, val;
rc = xenbus_scanf(XBT_NIL, dev->nodename, "online", "%d", &val);
if (rc != 1)
val = 0; /* no online node present */
return val;
return !!xenbus_read_unsigned(dev->nodename, "online", 0);
}
EXPORT_SYMBOL_GPL(xenbus_dev_is_online);

7
drivers/xen/xenbus/xenbus_xs.c
View file

@ -687,7 +687,7 @@ static bool xen_strict_xenbus_quirk(void)
}
static void xs_reset_watches(void)
{
int err, supported = 0;
int err;
if (!xen_hvm_domain() || xen_initial_domain())
return;
@ -695,9 +695,8 @@ static void xs_reset_watches(void)
if (xen_strict_xenbus_quirk())
return;
err = xenbus_scanf(XBT_NIL, "control",
"platform-feature-xs_reset_watches", "%d", &supported);
if (err != 1 || !supported)
if (!xenbus_read_unsigned("control",
"platform-feature-xs_reset_watches", 0))
return;
err = xs_error(xs_single(XBT_NIL, XS_RESET_WATCHES, "", NULL));