From e4953a93104c1fb1ef7989541f9867cc276467f9 Mon Sep 17 00:00:00 2001 From: Sreekanth Reddy Date: Wed, 1 Sep 2021 20:55:42 +0530 Subject: [PATCH] scsi: mpt3sas: Call cpu_relax() before calling udelay() 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 Signed-off-by: Sreekanth Reddy Signed-off-by: Martin K. Petersen --- drivers/scsi/mpt3sas/mpt3sas_base.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c index 6c82435..27eb652 100644 --- a/drivers/scsi/mpt3sas/mpt3sas_base.c +++ b/drivers/scsi/mpt3sas/mpt3sas_base.c @@ -1582,8 +1582,10 @@ mpt3sas_base_pause_mq_polling(struct MPT3SAS_ADAPTER *ioc) * 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); + } } } -- 2.7.4