From: James Smart <jsmart2021@gmail.com>
Date: Wed, 14 Aug 2019 16:57:05 -0700
Subject: scsi: lpfc: Add simple unlikely optimizations to reduce NVME latency
Git-commit: 1df09449902d1d4023a46ad02eab16483c54c49b
Patch-mainline: v5.4-rc1
References: bsc#1146215

While performing code review, several relatively simple optimizations can
be done in the fast path.

Add these optimizations (unlikely designators).

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Hannes Reinecke <hare@suse.com>
---
 drivers/scsi/lpfc/lpfc_nvme.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_nvme.c b/drivers/scsi/lpfc/lpfc_nvme.c
index 41b124b69947..106aef82620d 100644
--- a/drivers/scsi/lpfc/lpfc_nvme.c
+++ b/drivers/scsi/lpfc/lpfc_nvme.c
@@ -999,9 +999,9 @@ lpfc_nvme_io_cmd_wqe_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pwqeIn,
 	idx = lpfc_ncmd->cur_iocbq.hba_wqidx;
 	phba->sli4_hba.hdwq[idx].nvme_cstat.io_cmpls++;
 
-	if (vport->localport) {
+	if (unlikely(status && vport->localport)) {
 		lport = (struct lpfc_nvme_lport *)vport->localport->private;
-		if (lport && status) {
+		if (lport) {
 			if (bf_get(lpfc_wcqe_c_xb, wcqe))
 				atomic_inc(&lport->cmpl_fcp_xb);
 			atomic_inc(&lport->cmpl_fcp_err);
@@ -1141,7 +1141,7 @@ lpfc_nvme_io_cmd_wqe_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pwqeIn,
 		phba->ktime_last_cmd = lpfc_ncmd->ts_data_nvme;
 		lpfc_nvme_ktime(phba, lpfc_ncmd);
 	}
-	if (phba->cpucheck_on & LPFC_CHECK_NVME_IO) {
+	if (unlikely(phba->cpucheck_on & LPFC_CHECK_NVME_IO)) {
 		uint32_t cpu;
 		idx = lpfc_ncmd->cur_iocbq.hba_wqidx;
 		cpu = raw_smp_processor_id();
@@ -1475,7 +1475,7 @@ lpfc_nvme_fcp_io_submit(struct nvme_fc_local_port *pnvme_lport,
 		goto out_fail;
 	}
 
-	if (vport->load_flag & FC_UNLOADING) {
+	if (unlikely(vport->load_flag & FC_UNLOADING)) {
 		lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_IOERR,
 				 "6124 Fail IO, Driver unload\n");
 		atomic_inc(&lport->xmt_fcp_err);
-- 
2.16.4