From: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Date: Wed, 1 Sep 2021 20:55:42 +0530
Subject: scsi: mpt3sas: Call cpu_relax() before calling udelay()
Patch-mainline: v5.15-rc3
Git-commit: e4953a93104c1fb1ef7989541f9867cc276467f9
References: jsc#SLE-19730
Call cpu_relax() while waiting for the current blk-mq polling instance to
complete.
Link: https://lore.kernel.org/r/20210901152542.27866-1-sreekanth.reddy@broadcom.com
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Martin Wilck <mwilck@suse.com>
---
drivers/scsi/mpt3sas/mpt3sas_base.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/scsi/mpt3sas/mpt3sas_base.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
@@ -1582,8 +1582,10 @@ mpt3sas_base_pause_mq_polling(struct MPT
* wait for current poll to complete.
*/
for (qid = 0; qid < iopoll_q_count; qid++) {
- while (atomic_read(&ioc->io_uring_poll_queues[qid].busy))
+ while (atomic_read(&ioc->io_uring_poll_queues[qid].busy)) {
+ cpu_relax();
udelay(500);
+ }
}
}