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{
    "id": 810986,
    "url": "http://patchwork.ozlabs.org/api/patches/810986/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/linux-gpio/patch/1504784522-26841-6-git-send-email-yamada.masahiro@socionext.com/",
    "project": {
        "id": 42,
        "url": "http://patchwork.ozlabs.org/api/projects/42/?format=api",
        "name": "Linux GPIO development",
        "link_name": "linux-gpio",
        "list_id": "linux-gpio.vger.kernel.org",
        "list_email": "linux-gpio@vger.kernel.org",
        "web_url": "",
        "scm_url": "",
        "webscm_url": "",
        "list_archive_url": "",
        "list_archive_url_format": "",
        "commit_url_format": ""
    },
    "msgid": "<1504784522-26841-6-git-send-email-yamada.masahiro@socionext.com>",
    "list_archive_url": null,
    "date": "2017-09-07T11:42:01",
    "name": "[v4,5/6] irqdomain: add IRQ_DOMAIN_FLAG_NO_CREATE flag",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "c0baf99744b85da77f71359812a5cc5ea5e9e1e7",
    "submitter": {
        "id": 65882,
        "url": "http://patchwork.ozlabs.org/api/people/65882/?format=api",
        "name": "Masahiro Yamada",
        "email": "yamada.masahiro@socionext.com"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/linux-gpio/patch/1504784522-26841-6-git-send-email-yamada.masahiro@socionext.com/mbox/",
    "series": [
        {
            "id": 1983,
            "url": "http://patchwork.ozlabs.org/api/series/1983/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/linux-gpio/list/?series=1983",
            "date": "2017-09-07T11:41:57",
            "name": "irqdomain, gpio: expand irq_domain_push_irq() for DT use and use it for GPIO",
            "version": 4,
            "mbox": "http://patchwork.ozlabs.org/series/1983/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/810986/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/810986/checks/",
    "tags": {},
    "related": [],
    "headers": {
        "Return-Path": "<linux-gpio-owner@vger.kernel.org>",
        "X-Original-To": "incoming@patchwork.ozlabs.org",
        "Delivered-To": "patchwork-incoming@bilbo.ozlabs.org",
        "Authentication-Results": [
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        ],
        "Received": [
            "from vger.kernel.org (vger.kernel.org [209.132.180.67])\n\tby ozlabs.org (Postfix) with ESMTP id 3xnzDS2ZwMz9t2W\n\tfor <incoming@patchwork.ozlabs.org>;\n\tThu,  7 Sep 2017 21:46:00 +1000 (AEST)",
            "(majordomo@vger.kernel.org) by vger.kernel.org via listexpand\n\tid S1755114AbdIGLp3 (ORCPT <rfc822;incoming@patchwork.ozlabs.org>);\n\tThu, 7 Sep 2017 07:45:29 -0400",
            "from conuserg-09.nifty.com ([210.131.2.76]:17251 \"EHLO\n\tconuserg-09.nifty.com\" rhost-flags-OK-OK-OK-OK) by vger.kernel.org\n\twith ESMTP id S1755223AbdIGLn7 (ORCPT\n\t<rfc822; linux-gpio@vger.kernel.org>); Thu, 7 Sep 2017 07:43:59 -0400",
            "from pug.e01.socionext.com (p14092-ipngnfx01kyoto.kyoto.ocn.ne.jp\n\t[153.142.97.92]) (authenticated)\n\tby conuserg-09.nifty.com with ESMTP id v87BgcP3021413;\n\tThu, 7 Sep 2017 20:42:45 +0900"
        ],
        "DKIM-Filter": "OpenDKIM Filter v2.10.3 conuserg-09.nifty.com v87BgcP3021413",
        "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=nifty.com;\n\ts=dec2015msa; t=1504784566;\n\tbh=X/I1RnU3Gpzzhqg3pT6YB/0pqxY8xpqZMXsz/E2FYa4=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=v+mfaEEjEDASsoAlytN+uZbu7QfE3gxL7g6ZMN8YCQN5qbiQ/l9HTLL51oQAdXLMT\n\tb/aPPOxpSFMGrFUAXVc4I6lLT+sKvrzLrtKDVoe2qZ6B4QBa9Y/xodLq7yQ1CWgW9v\n\tHuQciynbixVNGknv8KEKl4IWEFYX6LbzffiZNco/GZqurQBjk/CD7H6/ft/YoH8Oy8\n\tNdg9RLjzPXmjNAUb8yOX/8QQnrxiGY5hX5mtey3vFQfR8y7Qmkm5AaslQZ+TU1tjCW\n\t/dOJVS0TjS3Z84hJIwu327cqF2vNHZhVP3GSoCaQNBpSL+aCM+jpuO3KOCTa9TLZZi\n\tR8pM5/2iTLWDQ==",
        "X-Nifty-SrcIP": "[153.142.97.92]",
        "From": "Masahiro Yamada <yamada.masahiro@socionext.com>",
        "To": "Marc Zyngier <marc.zyngier@arm.com>,\n\tThomas Gleixner <tglx@linutronix.de>,\n\tLinus Walleij <linus.walleij@linaro.org>,\n\tlinux-gpio@vger.kernel.org, Rob Herring <robh+dt@kernel.org>",
        "Cc": "Jassi Brar <jaswinder.singh@linaro.org>,\n\tdevicetree@vger.kernel.org, Jason Cooper <jason@lakedaemon.net>,\n\tMasami Hiramatsu <mhiramat@kernel.org>,\n\tDavid Daney <david.daney@cavium.com>,\n\tMasahiro Yamada <yamada.masahiro@socionext.com>,\n\tlinux-kernel@vger.kernel.org",
        "Subject": "[PATCH v4 5/6] irqdomain: add IRQ_DOMAIN_FLAG_NO_CREATE flag",
        "Date": "Thu,  7 Sep 2017 20:42:01 +0900",
        "Message-Id": "<1504784522-26841-6-git-send-email-yamada.masahiro@socionext.com>",
        "X-Mailer": "git-send-email 2.7.4",
        "In-Reply-To": "<1504784522-26841-1-git-send-email-yamada.masahiro@socionext.com>",
        "References": "<1504784522-26841-1-git-send-email-yamada.masahiro@socionext.com>",
        "Sender": "linux-gpio-owner@vger.kernel.org",
        "Precedence": "bulk",
        "List-ID": "<linux-gpio.vger.kernel.org>",
        "X-Mailing-List": "linux-gpio@vger.kernel.org"
    },
    "content": "When an irqchip driver uses irq_domain_push_irq(), all irqs should be\nstatically created by the irqchip.\n\nIf a device tries to allocate an irq on-the-fly, irq_domain_alloc_irqs()\nis called.  It allocates struct irq_data and invokes .alloc() hook\npassing fwspec as its argument.  This is probably not what the irqchip\nexpects (unless .alloc can call it recursively).\n\nThis issue could happen when a device tries to get irq after\nirq_domain_create_hierarchy(), but before irq_domain_push_irq().\n\nTo avoid the race, add IRQ_DOMAIN_FLAG_NO_CREATE flag.  This flag\nprevents devices from creating irqs.  Devices are only allowed to get\nalready existing irqs.\n\nSigned-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>\n---\n\nChanges in v4:\n  - Newly added\n\n\n include/linux/irqdomain.h | 3 +++\n kernel/irq/irqdomain.c    | 3 +++\n 2 files changed, 6 insertions(+)",
    "diff": "diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h\nindex 7609807..525de32 100644\n--- a/include/linux/irqdomain.h\n+++ b/include/linux/irqdomain.h\n@@ -195,6 +195,9 @@ enum {\n \t/* Irq domain name was allocated in __irq_domain_add() */\n \tIRQ_DOMAIN_NAME_ALLOCATED\t= (1 << 6),\n \n+\t/* Do not allow irq consumers to create irq */\n+\tIRQ_DOMAIN_FLAG_NO_CREATE\t= (1 << 7),\n+\n \t/*\n \t * Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved\n \t * for implementation specific purposes and ignored by the\ndiff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c\nindex b317a64..ecf107ab 100644\n--- a/kernel/irq/irqdomain.c\n+++ b/kernel/irq/irqdomain.c\n@@ -806,6 +806,9 @@ unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)\n \t\treturn 0;\n \t}\n \n+\tif (domain->flags & IRQ_DOMAIN_FLAG_NO_CREATE)\n+\t\treturn -EPROBE_DEFER;\n+\n \tif (irq_domain_is_hierarchy(domain)) {\n \t\tvirq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, fwspec);\n \t\tif (virq <= 0)\n",
    "prefixes": [
        "v4",
        "5/6"
    ]
}