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Mon, 13 Jul 2026 11:55:23 +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 11:55:23 +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 13/20] nvme: add context annotations for nvme_subsystems_lock Date: Mon, 13 Jul 2026 17:24:14 +0530 Message-ID: <20260713115444.465704-14-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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: i6BWqseZdvXsjF5OyEStSp8ePD9-S3By X-Proofpoint-Spam-Info: AW1haW4tMjYwNzEzMDEyMiBTYWx0ZWRfXx44yqvTJsyQa yzVQssw3+eDOH8GL3YIbd4nlzk/5Mak00CZPrD4BFs9BENBPYCXiJtxkCpiTpY/0X9nxiwvN3VY OOaF2SYVkGGffYlLok1umscP2+HPN68= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzEzMDEyMiBTYWx0ZWRfX6T1KnuvSTR5g mvE59+m0UyG8DNHJobo6SxSZV8Ap6rBEJd1deZIM+BDNg8NcRNmlybcY6nkL1whCFzBKtOOK1qB u4fNkQ5cHDlF5Y7JJ7C3+1VyGl26LOtfKNGBEMUVIDHnoxQJOqFp8SxA5DbIo4yb5hsi4x7XZm9 jMghQ6hS80rtJXwXPTuVC9+OQYCUp4NvsY2wh2lE9ur0dMe6OirLyI2FNmcIIYHOGtkCA0CEoOD +rhftSOwJImgOJc4oMUUxkmMMLZwULMf58647sa5nv1cQqP0SeMJMZhTWAPRhWgSA3iwsARE3xu e7h104M9+f4FMQ2OstG9iHF9/fOjDSiUkqhmB9YMgdyA3S7sO0umlGjMrgMLbmMQqe404KjQ6EY VlUjOkpEy28Hul7ECETY5gdTLNLRt6QgQlyTqNYDWy9sChtt29geDOAah5YwL4WD0e4hqA+1fTU kASzhxQpl17gLVGhcWA== X-Authority-Analysis: v=2.4 cv=IqMutr/g c=1 sm=1 tr=0 ts=6a54d232 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=ey47_XiNFC_5WBcqlPkA:9 X-Proofpoint-GUID: JwurJhM-YsHSMAGDzBbiGAudLrkREORx 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260713_045538_795037_49BD2975 X-CRM114-Status: GOOD ( 14.04 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org The global nvme_subsystems list, nvme_subsystem::entry, nvme_subsystem::ctrls, and nvme_ctrl::subsys_entry are protected by nvme_subsystems_lock. Annotate these objects with __guarded_by(&nvme_subsystems_lock) so that Clang's context analysis can validate accesses to them. __nvme_find_get_subsystem() and nvme_validate_cntlid() traverse the global subsystem list and subsystem controller list and therefore require callers to hold nvme_subsystems_lock. Annotate both helpers with __must_hold(&nvme_subsystems_lock). Signed-off-by: Nilay Shroff --- drivers/nvme/host/core.c | 4 +++- drivers/nvme/host/nvme.h | 9 ++++++--- 2 files changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index f7a4cdb988f1..26bca14e7d81 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -126,8 +126,8 @@ EXPORT_SYMBOL_GPL(nvme_reset_wq); struct workqueue_struct *nvme_delete_wq; EXPORT_SYMBOL_GPL(nvme_delete_wq); -static LIST_HEAD(nvme_subsystems); DEFINE_MUTEX(nvme_subsystems_lock); +static LIST_HEAD_GUARDED(nvme_subsystems, nvme_subsystems_lock); static DEFINE_IDA(nvme_instance_ida); static dev_t nvme_ctrl_base_chr_devt; @@ -3200,6 +3200,7 @@ static void nvme_put_subsystem(struct nvme_subsystem *subsys) } static struct nvme_subsystem *__nvme_find_get_subsystem(const char *subsysnqn) + __must_hold(&nvme_subsystems_lock) { struct nvme_subsystem *subsys; @@ -3244,6 +3245,7 @@ static inline bool nvme_is_io_ctrl(struct nvme_ctrl *ctrl) static bool nvme_validate_cntlid(struct nvme_subsystem *subsys, struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id) + __must_hold(&nvme_subsystems_lock) { struct nvme_ctrl *tmp; diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index 602d567f3def..607fa9664272 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -361,7 +361,8 @@ struct nvme_ctrl { wait_queue_head_t state_wq; struct nvme_subsystem *subsys; - struct list_head subsys_entry; + struct list_head subsys_entry + __guarded_by(&nvme_subsystems_lock); struct opal_dev *opal_dev; @@ -493,9 +494,11 @@ struct nvme_subsystem { * a separate refcount. */ struct kref ref; - struct list_head entry; + struct list_head entry + __guarded_by(&nvme_subsystems_lock); struct mutex lock; - struct list_head ctrls; + struct list_head ctrls + __guarded_by(&nvme_subsystems_lock); struct list_head nsheads __guarded_by(&lock); char subnqn[NVMF_NQN_SIZE]; -- 2.53.0