From: James Smart <jsmart2021@gmail.com>
Date: Tue, 12 Mar 2019 16:30:15 -0700
Subject: [PATCH] scsi: lpfc: Convert bootstrap mbx polling from msleep to
udelay
References: bsc#1136217,jsc#SLE-4722
Git-commit: e2ffe4d5dc3f45a8bb9e96790583530dfae7b8af
Patch-mainline: v5.2-rc1
Current code is using msleep when polling for hw ready. Unfortunately the
msleep routine isn't very accurate on rescheduling. In fact, on a busy
systems which reset the adapter, it became 10s of seconds before it was
rescheduled.
Fix by busy waiting using udelay. As we're now busy waiting, significantly
reduce the wait time so that we can exit the pool loop as soon as possible.
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>
Signed-off-by: Hannes Reinecke <hare@suse.de>
---
drivers/scsi/lpfc/lpfc_sli.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index 5b0ded23bfbf..22b2eafa3634 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -8515,7 +8515,7 @@ lpfc_sli4_wait_bmbx_ready(struct lpfc_hba *phba, LPFC_MBOXQ_t *mboxq)
bmbx_reg.word0 = readl(phba->sli4_hba.BMBXregaddr);
db_ready = bf_get(lpfc_bmbx_rdy, &bmbx_reg);
if (!db_ready)
- msleep(2);
+ mdelay(2);
if (time_after(jiffies, timeout))
return MBXERR_ERROR;
--
2.16.4