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{
    "id": 2219015,
    "url": "http://patchwork.ozlabs.org/api/patches/2219015/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260402093850.23075-1-icheng@nvidia.com/",
    "project": {
        "id": 28,
        "url": "http://patchwork.ozlabs.org/api/projects/28/?format=api",
        "name": "Linux PCI development",
        "link_name": "linux-pci",
        "list_id": "linux-pci.vger.kernel.org",
        "list_email": "linux-pci@vger.kernel.org",
        "web_url": null,
        "scm_url": null,
        "webscm_url": null,
        "list_archive_url": "",
        "list_archive_url_format": "",
        "commit_url_format": ""
    },
    "msgid": "<20260402093850.23075-1-icheng@nvidia.com>",
    "list_archive_url": null,
    "date": "2026-04-02T09:38:50",
    "name": "PCI/NPEM: Set LED_HW_PLUGGABLE for hotplug-capable ports",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "e7c7414aa3b92f3dd6973fea7d67eb33832d0d14",
    "submitter": {
        "id": 92853,
        "url": "http://patchwork.ozlabs.org/api/people/92853/?format=api",
        "name": "Richard Cheng",
        "email": "icheng@nvidia.com"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260402093850.23075-1-icheng@nvidia.com/mbox/",
    "series": [
        {
            "id": 498462,
            "url": "http://patchwork.ozlabs.org/api/series/498462/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/linux-pci/list/?series=498462",
            "date": "2026-04-02T09:38:50",
            "name": "PCI/NPEM: Set LED_HW_PLUGGABLE for hotplug-capable ports",
            "version": 1,
            "mbox": "http://patchwork.ozlabs.org/series/498462/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/2219015/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/2219015/checks/",
    "tags": {},
    "related": [],
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        "From": "Richard Cheng <icheng@nvidia.com>",
        "To": "bhelgaas@google.com",
        "Cc": "linux-pci@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\tjan@nvidia.com,\n\tnewtonl@nvidia.com,\n\tsreddym@nvidia.com,\n\tskomatineni@nvidia.com,\n\tvidyas@nvidia.com,\n\tkristinc@nvidia.com,\n\tkaihengf@nvidia.com,\n\tmochs@nvidia.com,\n\tRichard Cheng <icheng@nvidia.com>",
        "Subject": "[PATCH] PCI/NPEM: Set LED_HW_PLUGGABLE for hotplug-capable ports",
        "Date": "Thu,  2 Apr 2026 17:38:50 +0800",
        "Message-Id": "<20260402093850.23075-1-icheng@nvidia.com>",
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    "content": "NPEM registers LED classdevs on PCI endpoint that may be behind\nhotplug-capable ports. During hot-removal, led_classdev_unregister()\ncalls led_set_brightness(LED_OFF) which PCI config on a disconnected\ndevice, returning -ENODEV:\n\n```\nleds 0003:01:00.0:enclosure:ok: Setting an LED's brightness failed (-19)\n```\n\nThe LED core already suppresses this for devices with LED_HW_PLUGGABLE\nset, but NPEM never sets it. Add the flag since NPEM LEDs are on\nhot-pluggable hardware by nature.\n\nFixes: 4e893545ef87 (\"PCI/NPEM: Add Native PCIe Enclosure Management support\")\nSigned-off-by: Richard Cheng <icheng@nvidia.com>\nAcked-by: Kai-Heng Feng <kaihengf@nvidia.com>\n---\nThe bug was triggered on an ARM64 machine with CPU model Olympus.\nKernel version is v6.17.\nThe PCI topology is\n```\n$ sudo lspci -tv\n-[0001:00]---00.0-[01]--+-00.0  Mellanox Technologies CX8 Family [ConnectX-8]\n                        +-00.1  Mellanox Technologies CX8 Family [ConnectX-8]\n                        +-00.2  Mellanox Technologies CX8 Family [ConnectX-8]\n                        \\-00.3  Mellanox Technologies CX8 Family [ConnectX-8]\n-[0002:00]---00.0-[01]--\n-+-[0003:00]---00.0-[01]----00.0  Montage Technology Co., Ltd. Device c002\n \\-[0003:80]---00.0-[81]----00.0  Montage Technology Co., Ltd. Device c002\n-[0004:00]---00.0-[01]--\n-+-[0005:00]---00.0-[01]----00.0  Samsung Electronics Co Ltd Device a810\n +-[0005:40]---00.0-[41]----00.0  Samsung Electronics Co Ltd Device a810\n +-[0005:c0]---00.0-[c1]----00.0  Intel Corporation I210 Gigabit Network Connection\n \\-[0005:e0]---00.0-[e1-e2]----00.0-[e2]--+-00.0  ASPEED Technology, Inc. ASPEED Graphics Family\n                                          \\-02.0  ASPEED Technology, Inc. Device 2603\n-+-[0006:00]---00.0-[01]--\n \\-[0006:80]---00.0-[81]--\n```\nWe're targeting on 0003:01:00.0 CXL [0502]: Montage Technology Co., Ltd. Device [1b00:c002] (rev 03).\nFirst use `sudo setpci -s 0003:00:00.0 0x1f4.w=0x0002` to set UnmaskLinkDisable in CXL DVSEC.\nThen disable the link with `sudo setpci -v -s 0003:00:00.0 CAP_EXP+0x10.b=0x10:0x10`\n\n\nBest regards,\nRichard Cheng.\n---\n drivers/pci/npem.c | 2 +-\n 1 file changed, 1 insertion(+), 1 deletion(-)",
    "diff": "diff --git a/drivers/pci/npem.c b/drivers/pci/npem.c\nindex ffeeedf6e311..c51879fcd438 100644\n--- a/drivers/pci/npem.c\n+++ b/drivers/pci/npem.c\n@@ -504,7 +504,7 @@ static int pci_npem_set_led_classdev(struct npem *npem, struct npem_led *nled)\n \tled->brightness_get = brightness_get;\n \tled->max_brightness = 1;\n \tled->default_trigger = \"none\";\n-\tled->flags = 0;\n+\tled->flags = LED_HW_PLUGGABLE;\n \n \tret = led_classdev_register(&npem->dev->dev, led);\n \tif (ret)\n",
    "prefixes": []
}