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Tue, 02 Nov 2021 18:28:07 -0700 (PDT) Received: from [192.168.1.116] ([66.219.217.159]) by smtp.gmail.com with ESMTPSA id k11sm446896ilv.66.2021.11.02.18.28.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 02 Nov 2021 18:28:06 -0700 (PDT) Subject: Re: [PATCH 06/13] nvdimm/blk: avoid calling del_gendisk() on early failures To: Dan Williams , Luis Chamberlain Cc: Geoff Levand , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Jim Paris , Minchan Kim , Nitin Gupta , senozhatsky@chromium.org, Richard Weinberger , miquel.raynal@bootlin.com, vigneshr@ti.com, Vishal L Verma , Dave Jiang , "Weiny, Ira" , Keith Busch , Christoph Hellwig , Sagi Grimberg , linux-block@vger.kernel.org, linuxppc-dev , linux-mtd@lists.infradead.org, Linux NVDIMM , linux-nvme@lists.infradead.org, Linux Kernel Mailing List References: <20211015235219.2191207-1-mcgrof@kernel.org> <20211015235219.2191207-7-mcgrof@kernel.org> From: Jens Axboe Message-ID: <51f86768-04ca-bc7d-c17c-3d0357d84271@kernel.dk> Date: Tue, 2 Nov 2021 19:28:02 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211102_182813_441541_B103C42E X-CRM114-Status: GOOD ( 21.20 ) 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 On 11/2/21 6:49 PM, Dan Williams wrote: > On Tue, Nov 2, 2021 at 5:10 PM Luis Chamberlain wrote: >> >> On Fri, Oct 15, 2021 at 05:13:48PM -0700, Dan Williams wrote: >>> On Fri, Oct 15, 2021 at 4:53 PM Luis Chamberlain wrote: >>>> >>>> If nd_integrity_init() fails we'd get del_gendisk() called, >>>> but that's not correct as we should only call that if we're >>>> done with device_add_disk(). Fix this by providing unwinding >>>> prior to the devm call being registered and moving the devm >>>> registration to the very end. >>>> >>>> This should fix calling del_gendisk() if nd_integrity_init() >>>> fails. I only spotted this issue through code inspection. It >>>> does not fix any real world bug. >>>> >>> >>> Just fyi, I'm preparing patches to delete this driver completely as it >>> is unused by any shipping platform. I hope to get that removal into >>> v5.16. >> >> Curious if are you going to nuking it on v5.16? Otherwise it would stand >> in the way of the last few patches to add __must_check for the final >> add_disk() error handling changes. > > True, I don't think I can get it nuked in time, so you can add my > Reviewed-by for this one. Luis, I lost track of the nv* patches from this discussion. If you want them in 5.16 and they are reviewed, please do resend and I'll pick them up for the middle-of-merge-window push. -- Jens Axboe