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GET /api/1.1/patches/2223597/?format=api

HTTP 200 OK
Allow: GET, PUT, PATCH, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "id": 2223597,
    "url": "http://patchwork.ozlabs.org/api/1.1/patches/2223597/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/linux-i2c/patch/20260415165846.43926-3-sanman.pradhan@hpe.com/",
    "project": {
        "id": 35,
        "url": "http://patchwork.ozlabs.org/api/1.1/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": ""
    },
    "msgid": "<20260415165846.43926-3-sanman.pradhan@hpe.com>",
    "date": "2026-04-15T16:59:04",
    "name": "[2/4] i2c: muxes: pca954x: free parent IRQ before dismantling IRQ domain",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "d48395a74e567445ed28fb9b4ac44d56546620ec",
    "submitter": {
        "id": 93162,
        "url": "http://patchwork.ozlabs.org/api/1.1/people/93162/?format=api",
        "name": "Pradhan, Sanman",
        "email": "sanman.pradhan@hpe.com"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/linux-i2c/patch/20260415165846.43926-3-sanman.pradhan@hpe.com/mbox/",
    "series": [
        {
            "id": 500018,
            "url": "http://patchwork.ozlabs.org/api/1.1/series/500018/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/linux-i2c/list/?series=500018",
            "date": "2026-04-15T16:59:08",
            "name": "i2c: muxes: pca954x: bug fixes and cleanups",
            "version": 1,
            "mbox": "http://patchwork.ozlabs.org/series/500018/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/2223597/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/2223597/checks/",
    "tags": {},
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        "From": "\"Pradhan, Sanman\" <sanman.pradhan@hpe.com>",
        "To": "Peter Rosin <peda@axentia.se>",
        "CC": "\"linux-i2c@vger.kernel.org\" <linux-i2c@vger.kernel.org>,\n        \"linux-kernel@vger.kernel.org\" <linux-kernel@vger.kernel.org>,\n        Sanman Pradhan\n\t<psanman@juniper.net>,\n        \"stable@vger.kernel.org\" <stable@vger.kernel.org>",
        "Subject": "[PATCH 2/4] i2c: muxes: pca954x: free parent IRQ before dismantling\n IRQ domain",
        "Thread-Topic": "[PATCH 2/4] i2c: muxes: pca954x: free parent IRQ before\n dismantling IRQ domain",
        "Thread-Index": "AQHczPkq4kMPupvw/kWhhrTUsIVZoQ==",
        "Date": "Wed, 15 Apr 2026 16:59:04 +0000",
        "Message-ID": "<20260415165846.43926-3-sanman.pradhan@hpe.com>",
        "References": "<20260415165846.43926-1-sanman.pradhan@hpe.com>",
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    },
    "content": "From: Sanman Pradhan <psanman@juniper.net>\n\nThe parent IRQ is registered via devm_request_threaded_irq() in\nprobe, so it is not released until after .remove() returns via devm\ncleanup.  However, pca954x_cleanup() tears down the IRQ domain and\ndisposes the mappings during .remove().\n\nThe threaded IRQ handler reads the mux over SMBus and dispatches\nnested child IRQs via handle_nested_irq(irq_find_mapping(data->irq, i)).\nIf the handler fires while child adapters are being removed or after\nthe domain has been torn down, it operates on stale state.\n\nCall devm_free_irq() explicitly before removing child adapters and\ntearing down the IRQ domain so the handler is fully quiesced first.\n\npca954x_cleanup() is also used as the probe error-unwind path.  The\nIRQ domain is created by pca954x_irq_setup() before the parent IRQ is\nrequested, so on mid-probe failures data->irq is non-NULL while no\nmanaged IRQ resource exists yet.  Track whether the parent IRQ was\nsuccessfully requested and only call devm_free_irq() when that is the\ncase.\n\nFixes: f2114795f721 (\"i2c: mux: pca954x: Add interrupt controller support\")\nCc: stable@vger.kernel.org\nSigned-off-by: Sanman Pradhan <psanman@juniper.net>\n---\n drivers/i2c/muxes/i2c-mux-pca954x.c | 8 ++++++++\n 1 file changed, 8 insertions(+)",
    "diff": "diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c\nindex f0b8879ae5fa..c20a161e6a5b 100644\n--- a/drivers/i2c/muxes/i2c-mux-pca954x.c\n+++ b/drivers/i2c/muxes/i2c-mux-pca954x.c\n@@ -116,6 +116,7 @@ struct pca954x {\n \tstruct irq_domain *irq;\n \tunsigned int irq_mask;\n \traw_spinlock_t lock;\n+\tbool irq_requested;\n \tstruct regulator *supply;\n \n \tstruct gpio_desc *reset_gpio;\n@@ -464,8 +465,14 @@ static int pca954x_irq_setup(struct i2c_mux_core *muxc)\n static void pca954x_cleanup(struct i2c_mux_core *muxc)\n {\n \tstruct pca954x *data = i2c_mux_priv(muxc);\n+\tstruct i2c_client *client = data->client;\n \tint c, irq;\n \n+\tif (data->irq && data->irq_requested) {\n+\t\tdevm_free_irq(&client->dev, client->irq, data);\n+\t\tdata->irq_requested = false;\n+\t}\n+\n \ti2c_mux_del_adapters(muxc);\n \n \tif (data->irq) {\n@@ -656,6 +663,7 @@ static int pca954x_probe(struct i2c_client *client)\n \t\t\t\t\t\t\"pca954x\", data);\n \t\tif (ret)\n \t\t\tgoto fail_cleanup;\n+\t\tdata->irq_requested = true;\n \t}\n \n \t/*\n",
    "prefixes": [
        "2/4"
    ]
}