linux-kernel - [PATCH 1/1 v2] xen: xenbus: set error code on failure

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Date:   Mon,  5 Dec 2016 16:22:22 +0800
From:   Pan Bian <bianpan2016@....com>
To:     Juergen Gross <jgross@...e.com>,
        David Vrabel <david.vrabel@...rix.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        xen-devel@...ts.xenproject.org
Cc:     linux-kernel@...r.kernel.org, Pan Bian <bianpan2016@....com>
Subject: [PATCH 1/1 v2] xen: xenbus: set error code on failure

Variable err is initialized with 0. As a result, the return value may 
be 0 even if get_zeroed_page() fails to allocate memory. This patch fixes
the bug, initializing err with "-ENOMEM".

v1 is reviewed by: Juergen Gross <jgross@...e.com>

Signed-off-by: Pan Bian <bianpan2016@....com>
---
 drivers/xen/xenbus/xenbus_probe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
index 33a31cf..8178d5b 100644
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -702,7 +702,7 @@ static int __init xenbus_probe_initcall(void)
  */
 static int __init xenstored_local_init(void)
 {
-	int err = 0;
+	int err = -ENOMEM;
 	unsigned long page = 0;
 	struct evtchn_alloc_unbound alloc_unbound;
 
-- 
1.9.1