From patchwork Sat Jul 7 09:29:54 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jun Gao X-Patchwork-Id: 940768 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-i2c-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=mediatek.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 41N5tb4M2Rz9s0n for ; Sat, 7 Jul 2018 19:30:47 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751863AbeGGJaR (ORCPT ); Sat, 7 Jul 2018 05:30:17 -0400 Received: from mailgw02.mediatek.com ([210.61.82.184]:8603 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1751964AbeGGJaP (ORCPT ); Sat, 7 Jul 2018 05:30:15 -0400 X-UUID: 0f6443ad69ed4103b5c3f84fedec6092-20180707 Received: from mtkexhb01.mediatek.inc [(172.21.101.102)] by mailgw02.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 2078717432; Sat, 07 Jul 2018 17:30:07 +0800 Received: from mtkcas07.mediatek.inc (172.21.101.84) by mtkmbs03n1.mediatek.inc (172.21.101.181) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Sat, 7 Jul 2018 17:30:06 +0800 Received: from localhost.localdomain (10.17.3.153) by mtkcas07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1210.3 via Frontend Transport; Sat, 7 Jul 2018 17:30:05 +0800 From: Jun Gao To: Wolfram Sang CC: , , , , , , Jun Gao Subject: [PATCH v2 2/3] i2c: Add helper to ease DMA handling Date: Sat, 7 Jul 2018 17:29:54 +0800 Message-ID: <1530955795-17714-3-git-send-email-jun.gao@mediatek.com> X-Mailer: git-send-email 1.8.1.1.dirty In-Reply-To: <1530955795-17714-1-git-send-email-jun.gao@mediatek.com> References: <1530955795-17714-1-git-send-email-jun.gao@mediatek.com> MIME-Version: 1.0 X-MTK: N Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org From: Jun Gao This function is needed by i2c_get_dma_safe_msg_buf() potentially. It is used to free DMA safe buffer when DMA operation fails. Signed-off-by: Jun Gao --- drivers/i2c/i2c-core-base.c | 14 ++++++++++++++ include/linux/i2c.h | 1 + 2 files changed, 15 insertions(+) diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index 31d16ad..2b518ea 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -2288,6 +2288,20 @@ void i2c_release_dma_safe_msg_buf(struct i2c_msg *msg, u8 *buf) } EXPORT_SYMBOL_GPL(i2c_release_dma_safe_msg_buf); +/** + * i2c_free_dma_safe_msg_buf - free DMA safe buffer + * @msg: the message related to DMA safe buffer + * @buf: the buffer obtained from i2c_get_dma_safe_msg_buf(). May be NULL. + */ +void i2c_free_dma_safe_msg_buf(struct i2c_msg *msg, u8 *buf) +{ + if (!buf || buf == msg->buf) + return; + + kfree(buf); +} +EXPORT_SYMBOL_GPL(i2c_free_dma_safe_msg_buf); + MODULE_AUTHOR("Simon G. Vogl "); MODULE_DESCRIPTION("I2C-Bus main module"); MODULE_LICENSE("GPL"); diff --git a/include/linux/i2c.h b/include/linux/i2c.h index 254cd34..6d62f93 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -860,6 +860,7 @@ static inline u8 i2c_8bit_addr_from_msg(const struct i2c_msg *msg) u8 *i2c_get_dma_safe_msg_buf(struct i2c_msg *msg, unsigned int threshold); void i2c_release_dma_safe_msg_buf(struct i2c_msg *msg, u8 *buf); +void i2c_free_dma_safe_msg_buf(struct i2c_msg *msg, u8 *buf); int i2c_handle_smbus_host_notify(struct i2c_adapter *adap, unsigned short addr); /**