From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8D08EC4724C for ; Fri, 1 May 2020 13:28:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6E615208D6 for ; Fri, 1 May 2020 13:28:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588339716; bh=klBkbq68mGyRT+2KtEwZLVT96VkD8jSmhCqVYrAke5I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ty3zwRAFGA2FZzzCUzlB2q+JRfG4XTBwXy4JyeTIcHYfKSEXCQjXX/0Ytq/TdtRwB K4wGSxezGh6x5r86IVsDLKaqJNbd9SwMcYhoK0yqj2h33TvHanQCYDu8E8kW9/DuHT CYq+3cqLxA5lmLSrw5H7eb0wYZdKuH30eWHfyfQU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729641AbgEAN2f (ORCPT ); Fri, 1 May 2020 09:28:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:51530 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729619AbgEAN21 (ORCPT ); Fri, 1 May 2020 09:28:27 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4E10A2166E; Fri, 1 May 2020 13:28:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588339706; bh=klBkbq68mGyRT+2KtEwZLVT96VkD8jSmhCqVYrAke5I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Z6BOEG5Q/1uhI2OyfmCdzScsJlhrlxEvcP3yLIRZBL1gWe46dWxPBLDRrBOcc5/uA xpzNqX/8QtTlcyOolsmjBq6m2DePUnGgOz4ABVMv9FhC6UTk22bQveEsNh9NooGT8m jUTEDwBaElk1VJxji4fn16srf+CwGHrMYRvRAZcc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Boris Fiuczynski , Peter Oberparleiter , Cornelia Huck , Vasily Gorbik , Sasha Levin Subject: [PATCH 4.9 16/80] s390/cio: avoid duplicated ADD uevents Date: Fri, 1 May 2020 15:21:10 +0200 Message-Id: <20200501131519.033209634@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200501131513.810761598@linuxfoundation.org> References: <20200501131513.810761598@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Cornelia Huck [ Upstream commit 05ce3e53f375295c2940390b2b429e506e07655c ] The common I/O layer delays the ADD uevent for subchannels and delegates generating this uevent to the individual subchannel drivers. The io_subchannel driver will do so when the associated ccw_device has been registered -- but unconditionally, so more ADD uevents will be generated if a subchannel has been unbound from the io_subchannel driver and later rebound. To fix this, only generate the ADD event if uevents were still suppressed for the device. Fixes: fa1a8c23eb7d ("s390: cio: Delay uevents for subchannels") Message-Id: <20200327124503.9794-2-cohuck@redhat.com> Reported-by: Boris Fiuczynski Reviewed-by: Peter Oberparleiter Reviewed-by: Boris Fiuczynski Signed-off-by: Cornelia Huck Signed-off-by: Vasily Gorbik Signed-off-by: Sasha Levin --- drivers/s390/cio/device.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c index 6a58bc8f46e2a..1e97d1a034675 100644 --- a/drivers/s390/cio/device.c +++ b/drivers/s390/cio/device.c @@ -868,8 +868,10 @@ static void io_subchannel_register(struct ccw_device *cdev) * Now we know this subchannel will stay, we can throw * our delayed uevent. */ - dev_set_uevent_suppress(&sch->dev, 0); - kobject_uevent(&sch->dev.kobj, KOBJ_ADD); + if (dev_get_uevent_suppress(&sch->dev)) { + dev_set_uevent_suppress(&sch->dev, 0); + kobject_uevent(&sch->dev.kobj, KOBJ_ADD); + } /* make it known to the system */ ret = ccw_device_add(cdev); if (ret) { @@ -1077,8 +1079,11 @@ static int io_subchannel_probe(struct subchannel *sch) * Throw the delayed uevent for the subchannel, register * the ccw_device and exit. */ - dev_set_uevent_suppress(&sch->dev, 0); - kobject_uevent(&sch->dev.kobj, KOBJ_ADD); + if (dev_get_uevent_suppress(&sch->dev)) { + /* should always be the case for the console */ + dev_set_uevent_suppress(&sch->dev, 0); + kobject_uevent(&sch->dev.kobj, KOBJ_ADD); + } cdev = sch_get_cdev(sch); rc = ccw_device_add(cdev); if (rc) { -- 2.20.1