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Wed, 11 Feb 2026 07:22:36 +0000 (GMT) Message-ID: <5bfbb122-d073-4a5d-b955-74a1570b3649@linux.ibm.com> Date: Wed, 11 Feb 2026 12:52:34 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/4] nvme-tcp: move blk_mq_update_nr_hw_queues after nvme_unfreeze To: Yu Kuai , axboe@kernel.dk, kbusch@kernel.org, hch@lst.de, sagi@grimberg.me, sven@kernel.org, j@jannau.net, linux-block@vger.kernel.org, linux-nvme@lists.infradead.org Cc: tj@kernel.org, ming.lei@redhat.com, neal@gompa.dev, asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org References: <20260209082953.3053721-1-yukuai@fnnas.com> <20260209082953.3053721-3-yukuai@fnnas.com> Content-Language: en-US From: Nilay Shroff In-Reply-To: <20260209082953.3053721-3-yukuai@fnnas.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=YeCwJgRf c=1 sm=1 tr=0 ts=698c2e45 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=IkcTkHD0fZMA:10 a=HzLeVaNsDn8A:10 a=VkNPw1HP01LnGYTKEx00:22 a=Mpw57Om8IfrbqaoTuvik:22 a=GgsMoib0sEa3-_RKJdDe:22 a=VwQbUJbxAAAA:8 a=pGLkceISAAAA:8 a=20KFwNOVAAAA:8 a=tJLSzyRPAAAA:8 a=VnNF1IyMAAAA:8 a=MQnJZRgATxulN8aL5nkA:9 a=QEXdDO2ut3YA:10 a=H0xsmVfZzgdqH4_HIfU3:22 X-Proofpoint-GUID: gpacypDhKfnPoV9UQLZ8GXzWzREFdbR2 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjExMDA1OCBTYWx0ZWRfX983Q80k7vKem 3ah7oBaHX/DwaAWA1Mhm/hzRJd+sPt6udeXt6uhAlLer4hkf1ihp/6u5Alum8+HxWit/gd2U8Gy cp0cQLoqFkaz1BIYssb9i2GEsWkhQSgp9AVHwL3DMd1xyjfmXbh8fRkwKfTKSwBvzEG7UfP+5vy SrcpSq8vkTUne2SiuxVms14eNya10JsE1GDU40T1V5VoO+/71j2rR5DlmDd7jDTVK8aSmoOSHyi k6fQiHRHzg9epX02QL6zPva7R9GcLu7xri1JyDDd6VmjLB9scEcZXIb2mu/KKjNKf2hX1oZMLhq 0a9PKCnFtIHegXp4UpqwQjUlmpBWFfGP19lGN8qNYimS1MCrOhzUCvsCILdQzE5vWPz3xdETVas O/0Gp4JGFN7GnUlgqJG2iHDuiLel0KMfmD7HDSxlIYVaxPF8rTHNVxcW98v+NmimIl/OLdwfCX7 j87Oxn5MOFP3DS7Vu/Q== X-Proofpoint-ORIG-GUID: gpacypDhKfnPoV9UQLZ8GXzWzREFdbR2 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-02-10_03,2026-02-10_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 adultscore=0 bulkscore=0 malwarescore=0 phishscore=0 priorityscore=1501 lowpriorityscore=0 clxscore=1015 impostorscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2602110058 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260210_232304_776568_B3339509 X-CRM114-Status: GOOD ( 11.92 ) X-BeenThere: linux-arm-kernel@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-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2/9/26 1:59 PM, Yu Kuai wrote: > blk_mq_update_nr_hw_queues() freezes and unfreezes queues internally. > When the queue is already frozen before this call, the freeze depth > becomes 2. The internal unfreeze only decrements it to 1, leaving the > queue still frozen when debugfs_create_files() is called. > > This triggers WARN_ON_ONCE(q->mq_freeze_depth != 0) in > debugfs_create_files() and risks deadlock. > > Fix this by moving nvme_unfreeze() before blk_mq_update_nr_hw_queues() > so the queue is unfrozen before the call, allowing the internal > freeze/unfreeze to work correctly. > > Reported-by: Yi Zhang > Closes: https://lore.kernel.org/all/CAHj4cs9gNKEYAPagD9JADfO5UH+OiCr4P7OO2wjpfOYeM-RV=A@mail.gmail.com/ > Signed-off-by: Yu Kuai > --- Looks good to me: Reviewed-by: Nilay Shroff