From patchwork Wed Jun 26 00:41:48 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Keiji Hayashibara X-Patchwork-Id: 11016651 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C17B8924 for ; Wed, 26 Jun 2019 00:42:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A32E5285C7 for ; Wed, 26 Jun 2019 00:42:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 910AB285ED; Wed, 26 Jun 2019 00:42:04 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1AF0E285C7 for ; Wed, 26 Jun 2019 00:42:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726287AbfFZAl6 (ORCPT ); Tue, 25 Jun 2019 20:41:58 -0400 Received: from mx.socionext.com ([202.248.49.38]:7014 "EHLO mx.socionext.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726425AbfFZAl6 (ORCPT ); Tue, 25 Jun 2019 20:41:58 -0400 Received: from unknown (HELO iyokan-ex.css.socionext.com) ([172.31.9.54]) by mx.socionext.com with ESMTP; 26 Jun 2019 09:41:55 +0900 Received: from mail.mfilter.local (m-filter-1 [10.213.24.61]) by iyokan-ex.css.socionext.com (Postfix) with ESMTP id F38CC60629; Wed, 26 Jun 2019 09:41:55 +0900 (JST) Received: from 172.31.9.51 (172.31.9.51) by m-FILTER with ESMTP; Wed, 26 Jun 2019 09:41:55 +0900 Received: from yuzu.css.socionext.com (yuzu [172.31.8.45]) by kinkan.css.socionext.com (Postfix) with ESMTP id A99A21A14E3; Wed, 26 Jun 2019 09:41:55 +0900 (JST) Received: from hamster.e01.socionext.com (unknown [10.213.134.20]) by yuzu.css.socionext.com (Postfix) with ESMTP id 7F157120138; Wed, 26 Jun 2019 09:41:55 +0900 (JST) From: Keiji Hayashibara To: broonie@kernel.org, yamada.masahiro@socionext.com, linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: masami.hiramatsu@linaro.org, jaswinder.singh@linaro.org, linux-kernel@vger.kernel.org, hayashibara.keiji@socionext.com Subject: [PATCH 2/2] spi: uniphier: fix zero-length transfer Date: Wed, 26 Jun 2019 09:41:48 +0900 Message-Id: <1561509708-4175-3-git-send-email-hayashibara.keiji@socionext.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1561509708-4175-1-git-send-email-hayashibara.keiji@socionext.com> References: <1561509708-4175-1-git-send-email-hayashibara.keiji@socionext.com> Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The zero-length transfer results in timeout error because the transfer doesn't start. This commit modified to return success in this case. Signed-off-by: Keiji Hayashibara --- drivers/spi/spi-uniphier.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/spi/spi-uniphier.c b/drivers/spi/spi-uniphier.c index c3c35c0..b32c77d 100644 --- a/drivers/spi/spi-uniphier.c +++ b/drivers/spi/spi-uniphier.c @@ -331,6 +331,10 @@ static int uniphier_spi_transfer_one(struct spi_master *master, struct device *dev = master->dev.parent; unsigned long time_left; + /* Terminate and return success for 0 byte length transfer */ + if (!t->len) + return 0; + uniphier_spi_setup_transfer(spi, t); reinit_completion(&priv->xfer_done);