linux-kernel - [PATCH] xenbus: prefer xenbus_scanf() over xenbus

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Date:	Thu, 07 Jul 2016 02:07:23 -0600
From:	"Jan Beulich" <JBeulich@...e.com>
To:	<david.vrabel@...rix.com>, <boris.ostrovsky@...cle.com>,
	"Juergen Gross" <JGross@...e.com>
Cc:	<xen-devel@...ts.xenproject.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] xenbus: prefer xenbus_scanf() over xenbus_gather()

... for single items being collected: It is more typesafe (as the
compiler can check format string and to-be-written-to variable match)
and requires one less parameter to be passed.

Signed-off-by: Jan Beulich <jbeulich@...e.com>
---
 drivers/xen/xenbus/xenbus_client.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- 4.7-rc6-prefer-xenbus_scanf.orig/drivers/xen/xenbus/xenbus_client.c
+++ 4.7-rc6-prefer-xenbus_scanf/drivers/xen/xenbus/xenbus_client.c
@@ -926,9 +926,9 @@ EXPORT_SYMBOL_GPL(xenbus_unmap_ring);
  */
 enum xenbus_state xenbus_read_driver_state(const char *path)
 {
-	enum xenbus_state result;
-	int err = xenbus_gather(XBT_NIL, path, "state", "%d", &result, NULL);
-	if (err)
+	int result;
+
+	if (xenbus_scanf(XBT_NIL, path, "state", "%d", &result) != 1)
 		result = XenbusStateUnknown;
 
 	return result;