From patchwork Fri Feb 5 11:08:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alain Volmat X-Patchwork-Id: 12069987 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=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,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 DCF86C433E0 for ; Fri, 5 Feb 2021 11:17:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 933A864DB2 for ; Fri, 5 Feb 2021 11:17:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231391AbhBELQK (ORCPT ); Fri, 5 Feb 2021 06:16:10 -0500 Received: from mx07-00178001.pphosted.com ([185.132.182.106]:53234 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232014AbhBELKg (ORCPT ); Fri, 5 Feb 2021 06:10:36 -0500 Received: from pps.filterd (m0241204.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 115AojUb021324; Fri, 5 Feb 2021 12:09:45 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=selector1; bh=wyl8yuJ5frfOCwIh20m4pKBEyn+06N5LlzlyoyqaHZ0=; b=k0cS3luNGybNkRAFuiEc3XWINhv+8uQ32It41x0HLBvsLBL/xCVjXTA+ihHTLeW/gV3A /Or+1m8k9KDNdAQN7lTP+cRd6O1wz6JDZYdrx3D55Idq79+/ALIGFREkjttOglukWC17 8cJGFk5GPfp+7GYn6DHmkQKhxfdu4FxKfqzvMQpeutA7gPDqoOlnNZXaPJqF+qgtgPPw FfUbtYxQOtPDeZpZT59qmw/gbHsphD3jub75WdOmNvfmhuh4rX4LMgb7YqBLHIDYTcc3 0oHGRGWR6USocj1aOeVinR81wXRjaiPP5XsqZ3WZK9y/FEPL9AiVqVFYh3Aj3jxSRo8c kg== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 36ey7hfu2q-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 05 Feb 2021 12:09:45 +0100 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 46F56100034; Fri, 5 Feb 2021 12:09:45 +0100 (CET) Received: from Webmail-eu.st.com (sfhdag2node3.st.com [10.75.127.6]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 3B4D3229F3C; Fri, 5 Feb 2021 12:09:45 +0100 (CET) Received: from localhost (10.75.127.49) by SFHDAG2NODE3.st.com (10.75.127.6) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Fri, 5 Feb 2021 12:09:45 +0100 From: Alain Volmat To: , CC: , , , , , , , Subject: [PATCH 3/8] spi: stm32h7: ensure message are smaller than max size Date: Fri, 5 Feb 2021 12:08:57 +0100 Message-ID: <1612523342-10466-4-git-send-email-alain.volmat@foss.st.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1612523342-10466-1-git-send-email-alain.volmat@foss.st.com> References: <1612523342-10466-1-git-send-email-alain.volmat@foss.st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.49] X-ClientProxiedBy: SFHDAG2NODE1.st.com (10.75.127.4) To SFHDAG2NODE3.st.com (10.75.127.6) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369,18.0.737 definitions=2021-02-05_06:2021-02-05,2021-02-05 signatures=0 Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org Ensure that messages given to transfer_one handler can actually be handled by it. For that purpose rely on the SPI framework spi_split_transfers_maxsize function to split messages whenever necessary. Signed-off-by: Alain Volmat --- drivers/spi/spi-stm32.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c index 8c6af3aa0dc3..417a2aa2b98d 100644 --- a/drivers/spi/spi-stm32.c +++ b/drivers/spi/spi-stm32.c @@ -1013,6 +1013,20 @@ static int stm32_spi_prepare_msg(struct spi_master *master, !!(spi_dev->mode & SPI_LSB_FIRST), !!(spi_dev->mode & SPI_CS_HIGH)); + /* On STM32H7, messages should not exceed a maximum size setted + * afterward via the set_number_of_data function. In order to + * ensure that, split large messages into several messages + */ + if (spi->cfg->set_number_of_data) { + int ret; + + ret = spi_split_transfers_maxsize(master, msg, + STM32H7_SPI_TSIZE_MAX, + GFP_KERNEL | GFP_DMA); + if (ret) + return ret; + } + spin_lock_irqsave(&spi->lock, flags); /* CPOL, CPHA and LSB FIRST bits have common register */