From patchwork Thu Jan 2 22:05:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 234732 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 C33D1C3276C for ; Thu, 2 Jan 2020 22:27:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 987632253D for ; Thu, 2 Jan 2020 22:27:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578004039; bh=MSTZ94r89EHHY4WmSqK9lUuQzwQQFWDe2kPN7S+IW6U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=0lO4KH41C6qV6nXGPpX32WVobcYveRZDX2hQezfGztdaNfNnNXfk1rVBLG3GuKgfa QC/Dp0Mvlx6ax1zAH1l7cjHj/9K8NTb/Fcy5AakXjDYDvBiWssHtPCYUv5NWdmq/6x PDXqbbvs/VLSX4U/7miCVYElvmJe4h2vKwZjYDWQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729720AbgABW1S (ORCPT ); Thu, 2 Jan 2020 17:27:18 -0500 Received: from mail.kernel.org ([198.145.29.99]:55398 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729715AbgABW1O (ORCPT ); Thu, 2 Jan 2020 17:27:14 -0500 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 5E4FC21835; Thu, 2 Jan 2020 22:27:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578004033; bh=MSTZ94r89EHHY4WmSqK9lUuQzwQQFWDe2kPN7S+IW6U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1yGbZmv0Bax3EnsHeq51FUIuHXJWKNrPtCGf/IjvLBY7U2ruBpOy3FP7bP7tSISov BcZjycqM7RlUCOedt0Ox/gJtBXZOPeB+AKgS4eH+3gyuQnS86hkxGRVCMsW6HT8WUZ ifrdl9vvu9PxPEqjF7HRNfvvOCwVZijhW9+pIV+E= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Lukasz Majewski , Mark Brown , kbuild test robot , Sasha Levin Subject: [PATCH 4.9 010/171] spi: Add call to spi_slave_abort() function when spidev driver is released Date: Thu, 2 Jan 2020 23:05:41 +0100 Message-Id: <20200102220548.403262985@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200102220546.960200039@linuxfoundation.org> References: <20200102220546.960200039@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Lukasz Majewski [ Upstream commit 9f918a728cf86b2757b6a7025e1f46824bfe3155 ] This change is necessary for spidev devices (e.g. /dev/spidev3.0) working in the slave mode (like NXP's dspi driver for Vybrid SoC). When SPI HW works in this mode - the master is responsible for providing CS and CLK signals. However, when some fault happens - like for example distortion on SPI lines - the SPI Linux driver needs a chance to recover from this abnormal situation and prepare itself for next (correct) transmission. This change doesn't pose any threat on drivers working in master mode as spi_slave_abort() function checks if SPI slave mode is supported. Signed-off-by: Lukasz Majewski Link: https://lore.kernel.org/r/20190924110547.14770-2-lukma@denx.de Signed-off-by: Mark Brown Reported-by: kbuild test robot Link: https://lore.kernel.org/r/20190925091143.15468-2-lukma@denx.de Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/spi/spidev.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c index f4ea286b0121..a685c6114a8d 100644 --- a/drivers/spi/spidev.c +++ b/drivers/spi/spidev.c @@ -663,6 +663,9 @@ static int spidev_release(struct inode *inode, struct file *filp) if (dofree) kfree(spidev); } +#ifdef CONFIG_SPI_SLAVE + spi_slave_abort(spidev->spi); +#endif mutex_unlock(&device_list_lock); return 0;