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[96.255.20.138]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-506847d7bdesm62607671cf.6.2026.02.12.21.19.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Feb 2026 21:19:52 -0800 (PST) Date: Fri, 13 Feb 2026 00:19:50 -0500 From: Gregory Price To: dan.j.williams@intel.com Cc: linux-cxl@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@meta.com, dave@stgolabs.net, jonathan.cameron@huawei.com, dave.jiang@intel.com, alison.schofield@intel.com, vishal.l.verma@intel.com, ira.weiny@intel.com Subject: Re: [PATCH v3] cxl/memdev: fix deadlock in cxl_memdev_autoremove() on attach failure Message-ID: References: <20260211192228.2148713-1-gourry@gourry.net> <698e97998a33f_1cc5100e5@dwillia2-mobl4.notmuch> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <698e97998a33f_1cc5100e5@dwillia2-mobl4.notmuch> On Thu, Feb 12, 2026 at 07:16:41PM -0800, dan.j.williams@intel.com wrote: > Gregory Price wrote: > > cxl_memdev_autoremove() takes device_lock(&cxlmd->dev) via guard(device) > > and then calls cxl_memdev_unregister() when the attach callback was > > provided but cxl_mem_probe() failed to bind. > > > > cxl_memdev_unregister() calls > > cdev_device_del() > > device_del() > > bus_remove_device() > > device_release_driver() > > > > This path is reached when a driver uses the @attach parameter to > > devm_cxl_add_memdev() and the CXL topology fails to enumerate (e.g. > > DVSEC range registers decode outside platform-defined CXL ranges, > > causing the endpoint port probe to fail). > > > > Add cxl_memdev_attach_failed() to set the scope of the check correctly. > > > > Fixes: 29317f8dc6ed ("cxl/mem: Introduce cxl_memdev_attach for CXL-dependent operation") > > Signed-off-by: Gregory Price > > Looks good, > > Reviewed-by: Dan Williams > > This was a kreview find? Would it make sense to do something like > "Reported-by: kreview-"? Technically it's a combination of Claude using kreview, but I think this is reasonable since Claude falls over on some of this without the prompts. If that's something we want: Reported-by: kreview-c94b85d6d2