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nvme: Skip checking heads without namespaces

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If a task is holding a reference to a namespace on a removed controller,
the head will not be released. If the same controller is added again
later, its namespaces may not be successfully added. Instead, the user
will see kernel message "Duplicate IDs for nsid <X>".

This patch fixes that by skipping heads that don't have namespaces when
considering if a new namespace is safe to add.

Reported-by: Alex Gagniuc <Alex_Gagniuc@Dellteam.com>
Cc: stable@vger.kernel.org
Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch 2018-03-19 10:53:50 -06:00 committed by Jens Axboe
parent 9bad0404ec
commit 2079699c10
1 changed files with 1 additions and 0 deletions
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1
drivers/nvme/host/core.c
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@ -2809,6 +2809,7 @@ static int __nvme_check_ids(struct nvme_subsystem *subsys,
list_for_each_entry(h, &subsys->nsheads, entry) {
if (nvme_ns_ids_valid(&new->ids) &&
!list_empty(&h->list) &&
nvme_ns_ids_equal(&new->ids, &h->ids))
return -EINVAL;
}