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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=7F58wxD/dEQonKrzNoWM7DkNk/UH9ZF8NZLJCFZZJo4=; b=ZnlFI8fLEZC+pXL09OaLsKjdn8 sG2hdDcnkdd7ZQAAOmWguGc7OnVMevoBr9Iei6cSMyXAQixEc8APBeN/A8M4gCqUCYojYyBiRia7O 7wDEec/aFp7xuN5F775zNLNzsTp/rSR3Ay3VTbK1PNHfZokfRNvqNAX9BvqfJMUKuSdi3rm3MuWeX L6a8Q4FjRtkn9UeJ4Lhp3Lt/jbaePXbm+u8tO6lhIOBWl8Zvgdk3hjBymTruCXrQy+1R0u429f+a4 B0bkzO9hXCn6QDiaV77uGrK+Hfqt+kENvWzGuFAfXSbunwOgQu1cHy4uiqeb5kU5vGXxTPlHBSNa9 7+WGTsLw==; From: Luis Chamberlain To: axboe@kernel.dk, colyli@suse.de, kent.overstreet@gmail.com, kbusch@kernel.org, sagi@grimberg.me, vishal.l.verma@intel.com, dan.j.williams@intel.com, dave.jiang@intel.com, ira.weiny@intel.com, konrad.wilk@oracle.com, roger.pau@citrix.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, minchan@kernel.org, ngupta@vflare.org, senozhatsky@chromium.org Cc: xen-devel@lists.xenproject.org, nvdimm@lists.linux.dev, linux-nvme@lists.infradead.org, linux-bcache@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Luis Chamberlain Subject: [PATCH v2 03/10] nvme-multipath: add error handling support for add_disk() Date: Mon, 27 Sep 2021 15:00:32 -0700 Message-Id: <20210927220039.1064193-4-mcgrof@kernel.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210927220039.1064193-1-mcgrof@kernel.org> References: <20210927220039.1064193-1-mcgrof@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: Luis Chamberlain X-ZohoMail-DKIM: pass (identity @infradead.org) X-ZM-MESSAGEID: 1632780089573100001 Content-Type: text/plain; charset="utf-8" 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 --- drivers/nvme/host/multipath.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c index e8ccdd398f78..35cace4f3f5f 100644 --- a/drivers/nvme/host/multipath.c +++ b/drivers/nvme/host/multipath.c @@ -496,13 +496,22 @@ int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, str= uct nvme_ns_head *head) static void nvme_mpath_set_live(struct nvme_ns *ns) { struct nvme_ns_head *head =3D ns->head; + int rc; =20 if (!head->disk) return; =20 + /* + * 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 =3D device_add_disk(&head->subsys->dev, head->disk, + nvme_ns_id_attr_groups); + if (rc) + return; + set_bit(NVME_NSHEAD_DISK_LIVE, &head->flags); nvme_add_ns_head_cdev(head); } =20 --=20 2.30.2