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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 BB4CBC433DF for ; Tue, 16 Jun 2020 15:45:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 944852098B for ; Tue, 16 Jun 2020 15:45:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592322316; bh=AlRSOhceULdtsyQsNQk9q0cqHewFDyvCCJNm0cGIo8g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=YMS3a9iQnpc9IFQzM7r8GlNDOLAxA4kKPJnTRmDa9fDBv+Bp/p//rh1Pml8scPPpH sxJBTTx6nhKrbKtjTpMfwIQTy1PxvRaCCp06mbcAcS3iTDr9NN9lg3oxlPzOkBDEWG BpcI2qT/Ka7z8spek4jbYRPSjxdgoiqhrsQXHu5Y= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732068AbgFPPpP (ORCPT ); Tue, 16 Jun 2020 11:45:15 -0400 Received: from mail.kernel.org ([198.145.29.99]:36204 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732048AbgFPPpJ (ORCPT ); Tue, 16 Jun 2020 11:45:09 -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 5ADED21475; Tue, 16 Jun 2020 15:45:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592322308; bh=AlRSOhceULdtsyQsNQk9q0cqHewFDyvCCJNm0cGIo8g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=doCER2JeDb/+cMdO3qJ8CYl6DlqD7EltEEjqwKLa2dK0fNXVoV1MkLI5scMWwa827 AiS/XdfatH9vd6WrgRoQMLRBHS7lb0za45apBfTqD1wLnIi0+/zIO/FFLkewxSukR0 U/70UkKxRupGPwn5b842OHAtvNv7zq1mKVDxhdi0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Lukas Wunner , Linus Walleij , Mark Brown Subject: [PATCH 5.7 081/163] spi: Fix controller unregister order Date: Tue, 16 Jun 2020 17:34:15 +0200 Message-Id: <20200616153110.725656843@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200616153106.849127260@linuxfoundation.org> References: <20200616153106.849127260@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: Lukas Wunner commit 84855678add8aba927faf76bc2f130a40f94b6f7 upstream. When an SPI controller unregisters, it unbinds all its slave devices. For this, their drivers may need to access the SPI bus, e.g. to quiesce interrupts. However since commit ffbbdd21329f ("spi: create a message queueing infrastructure"), spi_destroy_queue() is executed before unbinding the slaves. It sets ctlr->running = false, thereby preventing SPI bus access and causing unbinding of slave devices to fail. Fix by unbinding slaves before calling spi_destroy_queue(). Fixes: ffbbdd21329f ("spi: create a message queueing infrastructure") Signed-off-by: Lukas Wunner Cc: stable@vger.kernel.org # v3.4+ Cc: Linus Walleij Link: https://lore.kernel.org/r/8aaf9d44c153fe233b17bc2dec4eb679898d7e7b.1589557526.git.lukas@wunner.de Signed-off-by: Mark Brown Signed-off-by: Greg Kroah-Hartman --- drivers/spi/spi.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -2760,6 +2760,8 @@ void spi_unregister_controller(struct sp struct spi_controller *found; int id = ctlr->bus_num; + device_for_each_child(&ctlr->dev, NULL, __unregister); + /* First make sure that this controller was ever added */ mutex_lock(&board_lock); found = idr_find(&spi_master_idr, id); @@ -2772,7 +2774,6 @@ void spi_unregister_controller(struct sp list_del(&ctlr->list); mutex_unlock(&board_lock); - device_for_each_child(&ctlr->dev, NULL, __unregister); device_unregister(&ctlr->dev); /* free bus id */ mutex_lock(&board_lock);