linux-kernel - [PATCH] xen: check return value of xenbus

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Date:	Mon, 19 Oct 2015 16:02:51 +0000
From:	Insu Yun <wuninsu@...il.com>
To:	dmitry.torokhov@...il.com, wei.liu2@...rix.com,
	david.vrabel@...rix.com, stefano.stabellini@...citrix.com,
	julien.grall@...rix.com, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	taesoo@...ech.edu, yeongjin.jang@...ech.edu, insu@...ech.edu,
	changwoo@...ech.edu, Insu Yun <wuninsu@...il.com>
Subject: [PATCH] xen: check return value of xenbus_printf

Signed-off-by: Insu Yun <wuninsu@...il.com>
---
 drivers/input/misc/xen-kbdfront.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/input/misc/xen-kbdfront.c b/drivers/input/misc/xen-kbdfront.c
index 23d0549..0a9ad2cf 100644
--- a/drivers/input/misc/xen-kbdfront.c
+++ b/drivers/input/misc/xen-kbdfront.c
@@ -129,8 +129,14 @@ static int xenkbd_probe(struct xenbus_device *dev,
 
 	if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-abs-pointer", "%d", &abs) < 0)
 		abs = 0;
-	if (abs)
-		xenbus_printf(XBT_NIL, dev->nodename, "request-abs-pointer", "1");
+	if (abs) {
+		ret = xenbus_printf(XBT_NIL, dev->nodename,
+				    "request-abs-pointer", "1");
+		if (ret) {
+			pr_warning("xenkbd: can't request abs-pointer");
+			abs = 0;
+		}
+	}
 
 	/* keyboard */
 	kbd = input_allocate_device();
-- 
1.9.1

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