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Mon, 13 Jul 2026 11:55:36 +0000 (GMT) Received: from li-a84c74cc-2b13-11b2-a85c-acdd023f0674.bl1-in.ibm.com (unknown [9.123.7.57]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 13 Jul 2026 11:55:36 +0000 (GMT) From: Nilay Shroff To: linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org Cc: hch@lst.de, elver@google.com, kbusch@kernel.org, sagi@grimberg.me, axboe@fb.com, bvanassche@acm.org, gjoyce@linux.ibm.com, Nilay Shroff Subject: [PATCH v4 19/20] nvme: fix context analysis warning in tcp.c Date: Mon, 13 Jul 2026 17:24:20 +0530 Message-ID: <20260713115444.465704-20-nilay@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260713115444.465704-1-nilay@linux.ibm.com> References: <20260713115444.465704-1-nilay@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: 5huRcoF49ZqK5X3EUtzri1tUt_1iqIQc X-Proofpoint-Spam-Info: AW1haW4tMjYwNzEzMDEyMiBTYWx0ZWRfX7Sg9UXy/viWi QWUE0mfcOkC9t0KfONDUBxmRAfi5Is9B76VL0tzS4EHdDD/WW4gAY6iJtRskjUgKGzjbxBrJXCd 1rc9onVNFErt8YN49cB0agDzRD2aXuQ= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzEzMDEyMiBTYWx0ZWRfX28dWUO6HUTzY FDp99Zl7yUuPK2fIbYmfbNPkt17wnPRug6c+96OdVihyaoWhncyB/h4K41k9NELB6RLTK0y5Azq /GoF5Tv2n58e9ij3AyZSEtLWdwRL9NepLRwAHWnUumMrBuBOToW+f06aMQf/v2XrMgfA42K6Tn6 1Fv/B9l37td+zoj9JZYlzp9mPd1CcWmL7Vy2PjGYojXBjoGugk7q5QROKurKpO7LYXuWTXXMjAT 2yQ1fL8s3DarzhA5HKFhNi2rlmQfztVvu0kzaJFjTr2gnloRw7nVeTHfPfOUrTVvaawKtBjUbfF iM48gS9KqWLD2A2siEEJbAs5S+3XPx+Uf4LRjffGrXr5DpkRyuIX8thsaNemwX/IEVOIeqG5XjX 6/Rgpq65PR43D6LnF0IZCnCdFEFBYiskGNWabBoKX7BRSfmw4GUB7tgURT4wdlLUAznOMpUC2jZ tJ35MS7/lni73DdYa4A== X-Authority-Analysis: v=2.4 cv=IqMutr/g c=1 sm=1 tr=0 ts=6a54d23f cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=OaIR7dClPEixnHXHKS4A:9 X-Proofpoint-GUID: 4c6DzjkBMwTU4BPciZB4eg-N2GgKeGMJ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-13_02,2026-07-10_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 clxscore=1015 impostorscore=0 malwarescore=0 adultscore=0 phishscore=0 suspectscore=0 priorityscore=1501 bulkscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607130122 After adding Clang context annotations, compiling tcp.c reports the following warning while context analysis is enabled: drivers/nvme/host/tcp.c:2572:24: warning: passing pointer to variable 'list' requires holding mutex 'nvme_tcp_ctrl_mutex' [-Wthread-safety-pointer] 2572 | if (list_empty(&ctrl->list)) | ^ The above warning is triggered because ctrl->list is guarded with mutex nvme_tcp_ctrl_mutex but when list_empty(&ctrl->list) is invoked it doesn't acquire nvme_tcp_ctrl_mutex. Replace list_empty() with list_empty_careful(), which is intended for lockless inspection of list heads during teardown when no concurrent list modifications are expected. This suppresses the corresponding Clang context analysis warning while preserving the existing behavior. Signed-off-by: Nilay Shroff --- drivers/nvme/host/tcp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c index 8d2fbfc7cd8d..87d8067f3283 100644 --- a/drivers/nvme/host/tcp.c +++ b/drivers/nvme/host/tcp.c @@ -2579,7 +2579,7 @@ static void nvme_tcp_free_ctrl(struct nvme_ctrl *nctrl) { struct nvme_tcp_ctrl *ctrl = to_tcp_ctrl(nctrl); - if (list_empty(&ctrl->list)) + if (list_empty_careful(&ctrl->list)) goto free_ctrl; mutex_lock(&nvme_tcp_ctrl_mutex); -- 2.53.0