Commit e4953a93 authored by Sreekanth Reddy's avatar Sreekanth Reddy Committed by Martin K. Petersen
Browse files

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: default avatarBart Van Assche <bvanassche@acm.org>
Signed-off-by: default avatarSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 4e285508

drivers/scsi/mpt3sas/mpt3sas_base.c

+3 −1
Original line number Diff line number Diff line
@@ -1582,10 +1582,12 @@ 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);

		}

	}

}



/**

 * mpt3sas_base_resume_mq_polling - Resume polling on mq poll queues.