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Date: Wed, 22 Sep 2021 23:39:20 -0400 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Anton Eidelman <anton.eidelman@...il.com>, Anton Eidelman <anton@...htbitslabs.com>, Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>, Sasha Levin <sashal@...nel.org>, kbusch@...nel.org, axboe@...com, Christoph@...r.kernel.org, linux-nvme@...ts.infradead.org Subject: [PATCH AUTOSEL 4.19 06/15] nvme-multipath: fix ANA state updates when a namespace is not present From: Anton Eidelman <anton.eidelman@...il.com> [ Upstream commit 79f528afa93918519574773ea49a444c104bc1bd ] nvme_update_ana_state() has a deficiency that results in a failure to properly update the ana state for a namespace in the following case: NSIDs in ctrl->namespaces: 1, 3, 4 NSIDs in desc->nsids: 1, 2, 3, 4 Loop iteration 0: ns index = 0, n = 0, ns->head->ns_id = 1, nsid = 1, MATCH. Loop iteration 1: ns index = 1, n = 1, ns->head->ns_id = 3, nsid = 2, NO MATCH. Loop iteration 2: ns index = 2, n = 2, ns->head->ns_id = 4, nsid = 4, MATCH. Where the update to the ANA state of NSID 3 is missed. To fix this increment n and retry the update with the same ns when ns->head->ns_id is higher than nsid, Signed-off-by: Anton Eidelman <anton@...htbitslabs.com> Signed-off-by: Christoph Hellwig <hch@....de> Reviewed-by: Sagi Grimberg <sagi@...mberg.me> Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/nvme/host/multipath.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c index 64f699a1afd7..022e03643dac 100644 --- a/drivers/nvme/host/multipath.c +++ b/drivers/nvme/host/multipath.c @@ -398,14 +398,17 @@ static int nvme_update_ana_state(struct nvme_ctrl *ctrl, down_read(&ctrl->namespaces_rwsem); list_for_each_entry(ns, &ctrl->namespaces, list) { - unsigned nsid = le32_to_cpu(desc->nsids[n]); - + unsigned nsid; +again: + nsid = le32_to_cpu(desc->nsids[n]); if (ns->head->ns_id < nsid) continue; if (ns->head->ns_id == nsid) nvme_update_ns_ana_state(desc, ns); if (++n == nr_nsids) break; + if (ns->head->ns_id > nsid) + goto again; } up_read(&ctrl->namespaces_rwsem); return 0; -- 2.30.2
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