From patchwork Mon Sep 23 13:16:10 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Prarit Bhargava X-Patchwork-Id: 277188 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from ozlabs.org (localhost [IPv6:::1]) by ozlabs.org (Postfix) with ESMTP id 23ED32C0150 for ; Mon, 23 Sep 2013 23:55:16 +1000 (EST) Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by ozlabs.org (Postfix) with ESMTP id F3F402C009A for ; Mon, 23 Sep 2013 23:16:33 +1000 (EST) Received: from int-mx02.intmail.prod.int.phx2.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r8NDGVXv020124 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Mon, 23 Sep 2013 09:16:31 -0400 Received: from prarit.bos.redhat.com ([10.18.17.119]) by int-mx02.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id r8NDGUEt013819; Mon, 23 Sep 2013 09:16:31 -0400 From: Prarit Bhargava To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH] ppc, vio fix modalias_show return values Date: Mon, 23 Sep 2013 09:16:10 -0400 Message-Id: <1379942170-22458-1-git-send-email-prarit@redhat.com> X-Scanned-By: MIMEDefang 2.67 on 10.5.11.12 X-Mailman-Approved-At: Mon, 23 Sep 2013 23:54:51 +1000 Cc: Prarit Bhargava X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.16rc2 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" modalias_show() should return an empty string on error, not -ENODEV. This causes the following false and annoying error: > find /sys/devices -name modalias -print0 | xargs -0 cat >/dev/null cat: /sys/devices/vio/4000/modalias: No such device cat: /sys/devices/vio/4001/modalias: No such device cat: /sys/devices/vio/4002/modalias: No such device cat: /sys/devices/vio/4004/modalias: No such device cat: /sys/devices/vio/modalias: No such device Signed-off-by: Prarit Bhargava --- arch/powerpc/kernel/vio.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/kernel/vio.c b/arch/powerpc/kernel/vio.c index 78a3506..d38cc08 100644 --- a/arch/powerpc/kernel/vio.c +++ b/arch/powerpc/kernel/vio.c @@ -1530,11 +1530,15 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, const char *cp; dn = dev->of_node; - if (!dn) - return -ENODEV; + if (!dn) { + strcat(buf, "\n"); + return strlen(buf); + } cp = of_get_property(dn, "compatible", NULL); - if (!cp) - return -ENODEV; + if (!cp) { + strcat(buf, "\n"); + return strlen(buf); + } return sprintf(buf, "vio:T%sS%s\n", vio_dev->type, cp); }