[PATCH] nvme-fc: mask out blkcg_get_fc_appid() if BLK_CGROUP_FC_APPID is not set

[Hannes Reinecke]

If BLK_CGROUP_FC_APPID is not configured the symbol blkcg_get_fc_appid()
is undefined, so it needs to be masked out.

This patch is just a diff to the v2 patchset, as the original version has
already been merged.

Fixes: 980a0e068d14 ("scsi: nvme-fc: Add new routine nvme_fc_io_getuuid()")
Cc: Muneendra <muneendra.kumar at broadcom.com>
Cc: James Smart <jsmart2021 at gmail.com>
Signed-off-by: Hannes Reinecke <hare at suse.de>
---
 drivers/nvme/host/fc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index a11c69e68118..3c778bb0c294 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -1911,7 +1911,9 @@ char *nvme_fc_io_getuuid(struct nvmefc_fcp_req *req)
 	struct nvme_fc_fcp_op *op = fcp_req_to_fcp_op(req);
 	struct request *rq = op->rq;
 
-	return rq->bio ? blkcg_get_fc_appid(rq->bio) : NULL;
+	if (!IS_ENABLED(CONFIG_BLK_CGROUP_FC_APPID) || !rq->bio)
+		return NULL;
+	return blkcg_get_fc_appid(rq->bio);
 }
 EXPORT_SYMBOL_GPL(nvme_fc_io_getuuid);
 
-- 
2.29.2