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nvme: add nvme_get_ns helper

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Add a helper to avoid opencoding ns->kref increment.
Decrement is already done via nvme_put_ns helper.

Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Kanchan Joshi 2021-04-27 12:17:46 +05:30 committed by Christoph Hellwig
parent 48145b6256
commit 4c74d1f803
1 changed files with 7 additions and 2 deletions
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9
drivers/nvme/host/core.c
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@ -576,6 +576,11 @@ static void nvme_free_ns(struct kref *kref)
kfree(ns);
}
static inline bool nvme_get_ns(struct nvme_ns *ns)
{
return kref_get_unless_zero(&ns->kref);
}
void nvme_put_ns(struct nvme_ns *ns)
{
kref_put(&ns->kref, nvme_free_ns);
@ -1494,7 +1499,7 @@ static int nvme_ns_open(struct nvme_ns *ns)
/* should never be called due to GENHD_FL_HIDDEN */
if (WARN_ON_ONCE(nvme_ns_head_multipath(ns->head)))
goto fail;
if (!kref_get_unless_zero(&ns->kref))
if (!nvme_get_ns(ns))
goto fail;
if (!try_module_get(ns->ctrl->ops->module))
goto fail_put_ns;
@ -3582,7 +3587,7 @@ struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid)
down_read(&ctrl->namespaces_rwsem);
list_for_each_entry(ns, &ctrl->namespaces, list) {
if (ns->head->ns_id == nsid) {
if (!kref_get_unless_zero(&ns->kref))
if (!nvme_get_ns(ns))
continue;
ret = ns;
break;