From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753690AbdJGWi5 (ORCPT ); Sat, 7 Oct 2017 18:38:57 -0400 Received: from omzsmtpe02.verizonbusiness.com ([199.249.25.209]:14224 "EHLO omzsmtpe02.verizonbusiness.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753641AbdJGWix (ORCPT ); Sat, 7 Oct 2017 18:38:53 -0400 From: "Levin, Alexander (Sasha Levin)" Cc: Jan Beulich , Jan Beulich , "Boris Ostrovsky" , "Levin, Alexander (Sasha Levin)" X-Host: surveyor.tdc.vzwcorp.com To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" Subject: [PATCH review for 4.4 15/24] xen/manage: correct return value check on xenbus_scanf() Thread-Topic: [PATCH review for 4.4 15/24] xen/manage: correct return value check on xenbus_scanf() Thread-Index: AQHTP7zmishH+4VtgU2icUFWRdhPEQ== Date: Sat, 7 Oct 2017 22:37:47 +0000 Message-ID: <20171007223738.25013-15-alexander.levin@verizon.com> References: <20171007223738.25013-1-alexander.levin@verizon.com> In-Reply-To: <20171007223738.25013-1-alexander.levin@verizon.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.144.60.250] Content-Type: text/plain; charset="iso-8859-1" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by nfs id v97Mg96j026175 From: Jan Beulich [ Upstream commit 4fed1b125eb6252bde478665fc05d4819f774fa8 ] A negative return value indicates an error; in fact the function at present won't ever return zero. Signed-off-by: Jan Beulich Reviewed-by: Juergen Gross Signed-off-by: Boris Ostrovsky Signed-off-by: Sasha Levin --- drivers/xen/manage.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c index e12bd3635f83..e8850b0e3272 100644 --- a/drivers/xen/manage.c +++ b/drivers/xen/manage.c @@ -275,7 +275,7 @@ static void sysrq_handler(struct xenbus_watch *watch, const char **vec, err = xenbus_transaction_start(&xbt); if (err) return; - if (!xenbus_scanf(xbt, "control", "sysrq", "%c", &sysrq_key)) { + if (xenbus_scanf(xbt, "control", "sysrq", "%c", &sysrq_key) < 0) { pr_err("Unable to read sysrq code in control/sysrq\n"); xenbus_transaction_end(xbt, 1); return; -- 2.11.0