From: Daniel Wagner wagi@kernel.org
[ Upstream commit b0b26ad0e1943de25ce82a7e5af3574f31b1cf99 ]
The reference counting code can be simplified. Instead taking a tgtport refrerence at the beginning of nvmet_fc_alloc_hostport and put it back if not a new hostport object is allocated, only take it when a new hostport object is allocated.
Signed-off-by: Daniel Wagner wagi@kernel.org Reviewed-by: Hannes Reinecke hare@suse.de Signed-off-by: Christoph Hellwig hch@lst.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/nvme/target/fc.c | 22 +++++++--------------- 1 file changed, 7 insertions(+), 15 deletions(-)
diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c index d3ca59ae4c7af..606fdde21d629 100644 --- a/drivers/nvme/target/fc.c +++ b/drivers/nvme/target/fc.c @@ -1044,33 +1044,24 @@ nvmet_fc_alloc_hostport(struct nvmet_fc_tgtport *tgtport, void *hosthandle) struct nvmet_fc_hostport *newhost, *match = NULL; unsigned long flags;
+ /* + * Caller holds a reference on tgtport. + */ + /* if LLDD not implemented, leave as NULL */ if (!hosthandle) return NULL;
- /* - * take reference for what will be the newly allocated hostport if - * we end up using a new allocation - */ - if (!nvmet_fc_tgtport_get(tgtport)) - return ERR_PTR(-EINVAL); - spin_lock_irqsave(&tgtport->lock, flags); match = nvmet_fc_match_hostport(tgtport, hosthandle); spin_unlock_irqrestore(&tgtport->lock, flags);
- if (match) { - /* no new allocation - release reference */ - nvmet_fc_tgtport_put(tgtport); + if (match) return match; - }
newhost = kzalloc(sizeof(*newhost), GFP_KERNEL); - if (!newhost) { - /* no new allocation - release reference */ - nvmet_fc_tgtport_put(tgtport); + if (!newhost) return ERR_PTR(-ENOMEM); - }
spin_lock_irqsave(&tgtport->lock, flags); match = nvmet_fc_match_hostport(tgtport, hosthandle); @@ -1079,6 +1070,7 @@ nvmet_fc_alloc_hostport(struct nvmet_fc_tgtport *tgtport, void *hosthandle) kfree(newhost); newhost = match; } else { + nvmet_fc_tgtport_get(tgtport); newhost->tgtport = tgtport; newhost->hosthandle = hosthandle; INIT_LIST_HEAD(&newhost->host_list);