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GET /api/patches/2216805/?format=api
{ "id": 2216805, "url": "http://patchwork.ozlabs.org/api/patches/2216805/?format=api", "web_url": "http://patchwork.ozlabs.org/project/intel-wired-lan/patch/20260327072332.130320-9-aleksandr.loktionov@intel.com/", "project": { "id": 46, "url": "http://patchwork.ozlabs.org/api/projects/46/?format=api", "name": "Intel Wired Ethernet development", "link_name": "intel-wired-lan", "list_id": "intel-wired-lan.osuosl.org", "list_email": "intel-wired-lan@osuosl.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260327072332.130320-9-aleksandr.loktionov@intel.com>", "list_archive_url": null, "date": "2026-03-27T07:23:32", "name": "[net] ice: use READ_ONCE() to access cached PHC time", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "75961de07d4001a2376fe7b6284945bcd031baeb", "submitter": { "id": 75597, "url": "http://patchwork.ozlabs.org/api/people/75597/?format=api", "name": "Loktionov, Aleksandr", "email": "aleksandr.loktionov@intel.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/intel-wired-lan/patch/20260327072332.130320-9-aleksandr.loktionov@intel.com/mbox/", "series": [ { "id": 497714, "url": "http://patchwork.ozlabs.org/api/series/497714/?format=api", "web_url": "http://patchwork.ozlabs.org/project/intel-wired-lan/list/?series=497714", "date": "2026-03-27T07:23:32", "name": "[net] ice: use READ_ONCE() to access cached PHC time", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/497714/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2216805/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2216805/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<intel-wired-lan-bounces@osuosl.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "intel-wired-lan@lists.osuosl.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "intel-wired-lan@lists.osuosl.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=osuosl.org header.i=@osuosl.org header.a=rsa-sha256\n header.s=default header.b=uByyiM4b;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=2605:bc80:3010::138; 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envelope-from=intel-wired-lan-bounces@osuosl.org;\n receiver=<UNKNOWN> ", "DKIM-Filter": [ "OpenDKIM Filter v2.11.0 smtp1.osuosl.org 6327B83C60", "OpenDKIM Filter v2.11.0 smtp4.osuosl.org 8CDC541574" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=osuosl.org;\n\ts=default; t=1774596231;\n\tbh=ChGa9APwM8P7w31onV9RjJv+ygXYNPvU88/rrBsuSnQ=;\n\th=From:To:Cc:Date:In-Reply-To:References:Subject:List-Id:\n\t List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe:\n\t From;\n\tb=uByyiM4bHdemsywCldp/TdupqWEVpA1GphWPY+gozLY17MDd4MKbHyITCyBj5meAD\n\t 4I5dUX+18fG0XCu8zjGdqYDfhGSgoKEEaFH75ZjqJMdj0zCFgdpei6HbW2ijNuE3ss\n\t Sy1u+eRfUrH3NQbMFOoqAah4AykbgijzcEuQB6wtGNjf1JIrz1vewiUXFO2UgogPPH\n\t ZFWgFYr+ZsxzNYkNm8jtB1u4iIfMHz0HKasnls0a8tb53xN4FAdDOI1a+zGt8E9D/O\n\t xRJUYrdIZJ2HQ61OOwH8saYFRdyqdL3ECZMAwhy30/JOfm1IMaAKbs+Ka/uE378Opo\n\t EMgLVlQQNOcvQ==", "Received-SPF": "Pass (mailfrom) identity=mailfrom; client-ip=192.198.163.14;\n helo=mgamail.intel.com; envelope-from=aleksandr.loktionov@intel.com;\n receiver=<UNKNOWN>", "DMARC-Filter": "OpenDMARC Filter v1.4.2 smtp4.osuosl.org 8CDC541574", "X-CSE-ConnectionGUID": [ "EhdknACPQy+FA4dNuVswqQ==", "3TZ/1urxTieR8aq8K8zFlA==" ], "X-CSE-MsgGUID": [ "9Wu5pBu8RymHVoudbB2jIg==", "rjKNCQ8+ThubfTMcLNb9+A==" ], "X-IronPort-AV": [ "E=McAfee;i=\"6800,10657,11741\"; a=\"75733986\"", "E=Sophos;i=\"6.23,143,1770624000\"; d=\"scan'208\";a=\"75733986\"", "E=Sophos;i=\"6.23,143,1770624000\"; d=\"scan'208\";a=\"255739124\"" ], "X-ExtLoop1": "1", "From": "Aleksandr Loktionov <aleksandr.loktionov@intel.com>", "To": "intel-wired-lan@lists.osuosl.org, anthony.l.nguyen@intel.com,\n aleksandr.loktionov@intel.com", "Cc": "netdev@vger.kernel.org, Sergey Temerkhanov <sergey.temerkhanov@intel.com>", "Date": "Fri, 27 Mar 2026 08:23:32 +0100", "Message-ID": "<20260327072332.130320-9-aleksandr.loktionov@intel.com>", "X-Mailer": "git-send-email 2.52.0", "In-Reply-To": "<20260327072332.130320-1-aleksandr.loktionov@intel.com>", "References": "<20260327072332.130320-1-aleksandr.loktionov@intel.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Mailman-Original-DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple;\n d=intel.com; i=@intel.com; q=dns/txt; s=Intel;\n t=1774596228; x=1806132228;\n h=from:to:cc:subject:date:message-id:in-reply-to:\n references:mime-version:content-transfer-encoding;\n bh=SkeueQB1As0bMn8ZudMMXCS+i2wWNrQl5dDeglS+N8g=;\n b=C/YSaaX30pnHBmu4p4bDlsT4qYZl//ReH+wCApvrZIFpL/EZfGSb5M/j\n YHDvezP54d8xZy3GgxwqV0ZGTSuKk6l6NG2eLMqxBpZ5XZRFdHEQeULnQ\n aLY4t+q5+yvYj/lx6Y2Ue3ZlnPlqxrJOXkyIt3tG7xWOWDHBCAoojF5Tj\n VZ70KDKKjwYz+IouL0brShHVvfviKCxsAs7Q4KSc7/aiuk3UY5WRxNpXV\n iF54ii5evkWeqfVAEhFK0yQdwbygX6hXDd4v0fIw3oTo8OQqv/CVShyO7\n hVuXC+Xg/PGLKERWYBnxOpRYRh9SbHB2hYiFPw2LZtWF+HojLj/SjvfxB\n w==;", "X-Mailman-Original-Authentication-Results": [ "smtp4.osuosl.org;\n dmarc=pass (p=none dis=none)\n header.from=intel.com", "smtp4.osuosl.org;\n dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com\n header.a=rsa-sha256 header.s=Intel header.b=C/YSaaX3" ], "Subject": "[Intel-wired-lan] [PATCH net] ice: use READ_ONCE() to access cached\n PHC time", "X-BeenThere": "intel-wired-lan@osuosl.org", "X-Mailman-Version": "2.1.30", "Precedence": "list", "List-Id": "Intel Wired Ethernet Linux Kernel Driver Development\n <intel-wired-lan.osuosl.org>", "List-Unsubscribe": "<https://lists.osuosl.org/mailman/options/intel-wired-lan>,\n <mailto:intel-wired-lan-request@osuosl.org?subject=unsubscribe>", "List-Archive": "<http://lists.osuosl.org/pipermail/intel-wired-lan/>", "List-Post": "<mailto:intel-wired-lan@osuosl.org>", "List-Help": "<mailto:intel-wired-lan-request@osuosl.org?subject=help>", "List-Subscribe": "<https://lists.osuosl.org/mailman/listinfo/intel-wired-lan>,\n <mailto:intel-wired-lan-request@osuosl.org?subject=subscribe>", "Errors-To": "intel-wired-lan-bounces@osuosl.org", "Sender": "\"Intel-wired-lan\" <intel-wired-lan-bounces@osuosl.org>" }, "content": "From: Sergey Temerkhanov <sergey.temerkhanov@intel.com>\n\nptp.cached_phc_time is a 64-bit value updated by a periodic work item\non one CPU and read locklessly on another. On 32-bit or non-atomic\narchitectures this can result in a torn read. Use READ_ONCE() to\nenforce a single atomic load.\n\nFixes: 77a781155a65 (\"ice: enable receive hardware timestamping\")\nCc: stable@vger.kernel.org\nSigned-off-by: Sergey Temerkhanov <sergey.temerkhanov@intel.com>\nSigned-off-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>\n---\n\n drivers/net/ethernet/intel/ice/ice_ptp.c | 2 +-\n 1 file changed, 1 insertion(+), 1 deletion(-)", "diff": "diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c\nindex 8b0530b..2ea4dbc 100644\n--- a/drivers/net/ethernet/intel/ice/ice_ptp.c\n+++ b/drivers/net/ethernet/intel/ice/ice_ptp.c\n@@ -350,7 +350,7 @@ static u64 ice_ptp_extend_40b_ts(struct ice_pf *pf, u64 in_tstamp)\n \t\treturn 0;\n \t}\n \n-\treturn ice_ptp_extend_32b_ts(pf->ptp.cached_phc_time,\n+\treturn ice_ptp_extend_32b_ts(READ_ONCE(pf->ptp.cached_phc_time),\n \t\t\t\t (in_tstamp >> 8) & mask);\n }\n \n", "prefixes": [ "net" ] }