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{
    "id": 816404,
    "url": "http://patchwork.ozlabs.org/api/patches/816404/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/linux-i2c/patch/20170920185956.13874-6-wsa+renesas@sang-engineering.com/",
    "project": {
        "id": 35,
        "url": "http://patchwork.ozlabs.org/api/projects/35/?format=api",
        "name": "Linux I2C development",
        "link_name": "linux-i2c",
        "list_id": "linux-i2c.vger.kernel.org",
        "list_email": "linux-i2c@vger.kernel.org",
        "web_url": "",
        "scm_url": "",
        "webscm_url": "",
        "list_archive_url": "",
        "list_archive_url_format": "",
        "commit_url_format": ""
    },
    "msgid": "<20170920185956.13874-6-wsa+renesas@sang-engineering.com>",
    "list_archive_url": null,
    "date": "2017-09-20T18:59:55",
    "name": "[RFC,v5,5/6] i2c: rcar: skip DMA if buffer is not safe",
    "commit_ref": null,
    "pull_url": null,
    "state": "superseded",
    "archived": false,
    "hash": "17617d4ac7f1843fbe65c3e7ebe834cc72381ae0",
    "submitter": {
        "id": 69646,
        "url": "http://patchwork.ozlabs.org/api/people/69646/?format=api",
        "name": "Wolfram Sang",
        "email": "wsa+renesas@sang-engineering.com"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/linux-i2c/patch/20170920185956.13874-6-wsa+renesas@sang-engineering.com/mbox/",
    "series": [
        {
            "id": 4199,
            "url": "http://patchwork.ozlabs.org/api/series/4199/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/linux-i2c/list/?series=4199",
            "date": "2017-09-20T18:59:56",
            "name": "i2c: document DMA handling and add helpers for it",
            "version": 5,
            "mbox": "http://patchwork.ozlabs.org/series/4199/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/816404/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/816404/checks/",
    "tags": {},
    "related": [],
    "headers": {
        "Return-Path": "<linux-i2c-owner@vger.kernel.org>",
        "X-Original-To": "incoming@patchwork.ozlabs.org",
        "Delivered-To": "patchwork-incoming@bilbo.ozlabs.org",
        "Authentication-Results": "ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=vger.kernel.org\n\t(client-ip=209.132.180.67; helo=vger.kernel.org;\n\tenvelope-from=linux-i2c-owner@vger.kernel.org;\n\treceiver=<UNKNOWN>)",
        "Received": [
            "from vger.kernel.org (vger.kernel.org [209.132.180.67])\n\tby ozlabs.org (Postfix) with ESMTP id 3xy8GL5W6Bz9s4s\n\tfor <incoming@patchwork.ozlabs.org>;\n\tThu, 21 Sep 2017 05:00:58 +1000 (AEST)",
            "(majordomo@vger.kernel.org) by vger.kernel.org via listexpand\n\tid S1751707AbdITTAj (ORCPT <rfc822;incoming@patchwork.ozlabs.org>);\n\tWed, 20 Sep 2017 15:00:39 -0400",
            "from sauhun.de ([88.99.104.3]:38847 \"EHLO pokefinder.org\"\n\trhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP\n\tid S1751572AbdITTAG (ORCPT <rfc822;linux-i2c@vger.kernel.org>);\n\tWed, 20 Sep 2017 15:00:06 -0400",
            "from localhost (p54B332E6.dip0.t-ipconnect.de [84.179.50.230])\n\tby pokefinder.org (Postfix) with ESMTPSA id 1A6842C43A8;\n\tWed, 20 Sep 2017 21:00:04 +0200 (CEST)"
        ],
        "From": "Wolfram Sang <wsa+renesas@sang-engineering.com>",
        "To": "linux-i2c@vger.kernel.org",
        "Cc": "linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org,\n\tlinux-iio@vger.kernel.org, linux-input@vger.kernel.org,\n\tlinux-media@vger.kernel.org, dri-devel@lists.freedesktop.org,\n\tWolfram Sang <wsa+renesas@sang-engineering.com>",
        "Subject": "[RFC PATCH v5 5/6] i2c: rcar: skip DMA if buffer is not safe",
        "Date": "Wed, 20 Sep 2017 20:59:55 +0200",
        "Message-Id": "<20170920185956.13874-6-wsa+renesas@sang-engineering.com>",
        "X-Mailer": "git-send-email 2.11.0",
        "In-Reply-To": "<20170920185956.13874-1-wsa+renesas@sang-engineering.com>",
        "References": "<20170920185956.13874-1-wsa+renesas@sang-engineering.com>",
        "Sender": "linux-i2c-owner@vger.kernel.org",
        "Precedence": "bulk",
        "List-ID": "<linux-i2c.vger.kernel.org>",
        "X-Mailing-List": "linux-i2c@vger.kernel.org"
    },
    "content": "This HW is prone to races, so it needs to setup new messages in irq\ncontext. That means we can't alloc bounce buffers if a message buffer is\nnot DMA safe. So, in that case, simply fall back to PIO.\n\nSigned-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>\n---\n drivers/i2c/busses/i2c-rcar.c | 2 +-\n 1 file changed, 1 insertion(+), 1 deletion(-)",
    "diff": "diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c\nindex 15d764afec3b29..8a2ae3e6c561c4 100644\n--- a/drivers/i2c/busses/i2c-rcar.c\n+++ b/drivers/i2c/busses/i2c-rcar.c\n@@ -359,7 +359,7 @@ static void rcar_i2c_dma(struct rcar_i2c_priv *priv)\n \tint len;\n \n \t/* Do not use DMA if it's not available or for messages < 8 bytes */\n-\tif (IS_ERR(chan) || msg->len < 8)\n+\tif (IS_ERR(chan) || msg->len < 8 || !(msg->flags & I2C_M_DMA_SAFE))\n \t\treturn;\n \n \tif (read) {\n",
    "prefixes": [
        "RFC",
        "v5",
        "5/6"
    ]
}