From patchwork Fri Oct 15 23:52:08 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luis Chamberlain X-Patchwork-Id: 12563067 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 89E8A2C89 for ; Fri, 15 Oct 2021 23:53:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=bWrYy27/Ft+aLDChsLBGCGZJ9I29Pbmku4dc9v02/r0=; b=IY2ti5CFu7tk7l/1b1dOBrzqFV aY9UvoJKkeTLc2QMRNWX6uc1JjZmitgQWYAqCJrHP3ukaJAS1Znz/MF42OZxUAt/7nUAnIiAlaBdw qxqWz+L6WdoNhUxemK8IqK8TTz5PiYshQ9/0IYTCEPZsgX8UFxP25gp3gw4mI5zwxPE0jpzsJMdNF piTCgmlnkXlxAQxhoX2yeSSTMZLJghSLJlHFu34Sux+hr4llFOQyl8BtkdxpGRy5hn40pVSQcZxr9 8NMljnWNJV+SY+YkxBhw9vXuVPxdhVfyQszbzyQE3EdW1D1TeSngbhl2jloBhz2cfG6cuZlUSHqj0 9sJQoaow==; Received: from mcgrof by bombadil.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1mbWzt-009C2x-0D; Fri, 15 Oct 2021 23:52:21 +0000 From: Luis Chamberlain To: axboe@kernel.dk, geoff@infradead.org, mpe@ellerman.id.au, benh@kernel.crashing.org, paulus@samba.org, jim@jtan.com, minchan@kernel.org, ngupta@vflare.org, senozhatsky@chromium.org, richard@nod.at, miquel.raynal@bootlin.com, vigneshr@ti.com, dan.j.williams@intel.com, vishal.l.verma@intel.com, dave.jiang@intel.com, ira.weiny@intel.com, kbusch@kernel.org, hch@lst.de, sagi@grimberg.me Cc: linux-block@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mtd@lists.infradead.org, nvdimm@lists.linux.dev, linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, Luis Chamberlain Subject: [PATCH 02/13] nvme-multipath: add error handling support for add_disk() Date: Fri, 15 Oct 2021 16:52:08 -0700 Message-Id: <20211015235219.2191207-3-mcgrof@kernel.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211015235219.2191207-1-mcgrof@kernel.org> References: <20211015235219.2191207-1-mcgrof@kernel.org> Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Sender: Luis Chamberlain We never checked for errors on add_disk() as this function returned void. Now that this is fixed, use the shiny new error handling. Since we now can tell for sure when a disk was added, move setting the bit NVME_NSHEAD_DISK_LIVE only when we did add the disk successfully. Nothing to do here as the cleanup is done elsewhere. We take care and use test_and_set_bit() because it is protects against two nvme paths simultaneously calling device_add_disk() on the same namespace head. Signed-off-by: Luis Chamberlain Reviewed-by: Keith Busch Reviewed-by: Chaitanya Kulkarni --- drivers/nvme/host/multipath.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c index e8ccdd398f78..022837f7be41 100644 --- a/drivers/nvme/host/multipath.c +++ b/drivers/nvme/host/multipath.c @@ -496,13 +496,23 @@ int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head) static void nvme_mpath_set_live(struct nvme_ns *ns) { struct nvme_ns_head *head = ns->head; + int rc; if (!head->disk) return; + /* + * test_and_set_bit() is used because it is protecting against two nvme + * paths simultaneously calling device_add_disk() on the same namespace + * head. + */ if (!test_and_set_bit(NVME_NSHEAD_DISK_LIVE, &head->flags)) { - device_add_disk(&head->subsys->dev, head->disk, - nvme_ns_id_attr_groups); + rc = device_add_disk(&head->subsys->dev, head->disk, + nvme_ns_id_attr_groups); + if (rc) { + clear_bit(NVME_NSHEAD_DISK_LIVE, &ns->flags); + return; + } nvme_add_ns_head_cdev(head); }