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{
    "id": 2194088,
    "url": "http://patchwork.ozlabs.org/api/patches/2194088/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260206200529.10784-1-git@danielhodges.dev/",
    "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",
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    "msgid": "<20260206200529.10784-1-git@danielhodges.dev>",
    "list_archive_url": null,
    "date": "2026-02-06T20:05:29",
    "name": "PCI: epf-mhi: return 0 on success instead of positive jiffies",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "ca4aa2d67337c3b5b8a2795185e31667a7b3785d",
    "submitter": {
        "id": 92597,
        "url": "http://patchwork.ozlabs.org/api/people/92597/?format=api",
        "name": "Daniel Hodges",
        "email": "git@danielhodges.dev"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260206200529.10784-1-git@danielhodges.dev/mbox/",
    "series": [
        {
            "id": 491329,
            "url": "http://patchwork.ozlabs.org/api/series/491329/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/linux-pci/list/?series=491329",
            "date": "2026-02-06T20:05:29",
            "name": "PCI: epf-mhi: return 0 on success instead of positive jiffies",
            "version": 1,
            "mbox": "http://patchwork.ozlabs.org/series/491329/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/2194088/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/2194088/checks/",
    "tags": {},
    "related": [],
    "headers": {
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        ],
        "From": "Daniel Hodges <git@danielhodges.dev>",
        "To": "mani@kernel.org,\n\tkwilczynski@kernel.org",
        "Cc": "kishon@kernel.org,\n\tbhelgaas@google.com,\n\tmhi@lists.linux.dev,\n\tlinux-arm-msm@vger.kernel.org,\n\tlinux-pci@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\tstable@vger.kernel.org,\n\tDaniel Hodges <git@danielhodges.dev>",
        "Subject": "[PATCH] PCI: epf-mhi: return 0 on success instead of positive jiffies",
        "Date": "Fri,  6 Feb 2026 15:05:29 -0500",
        "Message-ID": "<20260206200529.10784-1-git@danielhodges.dev>",
        "X-Mailer": "git-send-email 2.52.0",
        "Precedence": "bulk",
        "X-Mailing-List": "linux-pci@vger.kernel.org",
        "List-Id": "<linux-pci.vger.kernel.org>",
        "List-Subscribe": "<mailto:linux-pci+subscribe@vger.kernel.org>",
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        "MIME-Version": "1.0",
        "Content-Transfer-Encoding": "8bit"
    },
    "content": "wait_for_completion_timeout() returns the number of jiffies remaining\non success (positive value) or 0 on timeout. The pci_epf_mhi_edma_read()\nand pci_epf_mhi_edma_write() functions use the return value directly as\ntheir own return value, only converting timeout (0) to -ETIMEDOUT.\n\nOn success, they return the positive jiffies value. The callers in\ndrivers/bus/mhi/ep/ring.c check for errors with \"if (ret < 0)\" for\nread_sync and \"if (ret)\" for write_sync. This causes write_sync success\ncases to be incorrectly treated as errors since the positive jiffies\nvalue is non-zero.\n\nFix by setting ret to 0 when wait_for_completion_timeout() succeeds.\n\nFixes: 7b99aaaddabb (\"PCI: epf-mhi: Add eDMA support\")\nCc: stable@vger.kernel.org\nSigned-off-by: Daniel Hodges <git@danielhodges.dev>\n---\n drivers/pci/endpoint/functions/pci-epf-mhi.c | 4 ++++\n 1 file changed, 4 insertions(+)",
    "diff": "diff --git a/drivers/pci/endpoint/functions/pci-epf-mhi.c b/drivers/pci/endpoint/functions/pci-epf-mhi.c\nindex 6643a88c7a0c..2f077d0b7957 100644\n--- a/drivers/pci/endpoint/functions/pci-epf-mhi.c\n+++ b/drivers/pci/endpoint/functions/pci-epf-mhi.c\n@@ -367,6 +367,8 @@ static int pci_epf_mhi_edma_read(struct mhi_ep_cntrl *mhi_cntrl,\n \t\tdev_err(dev, \"DMA transfer timeout\\n\");\n \t\tdmaengine_terminate_sync(chan);\n \t\tret = -ETIMEDOUT;\n+\t} else {\n+\t\tret = 0;\n \t}\n \n err_unmap:\n@@ -438,6 +440,8 @@ static int pci_epf_mhi_edma_write(struct mhi_ep_cntrl *mhi_cntrl,\n \t\tdev_err(dev, \"DMA transfer timeout\\n\");\n \t\tdmaengine_terminate_sync(chan);\n \t\tret = -ETIMEDOUT;\n+\t} else {\n+\t\tret = 0;\n \t}\n \n err_unmap:\n",
    "prefixes": []
}