From 10ee1f2206a3f5aa869bede4b7505b24203a7715 Mon Sep 17 00:00:00 2001 From: Tomas Henzl Date: Thu, 24 May 2018 17:12:46 +0200 Subject: scsi: mpt3sas: Add an I/O barrier A barrier should be added to ensure proper ordering of memory mapped writes. Signed-off-by: Tomas Henzl Acked-by: Chaitra P B Signed-off-by: Martin K. Petersen --- drivers/scsi/mpt3sas/mpt3sas_base.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/scsi/mpt3sas') diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c index 61f93a134956..293f04119eba 100644 --- a/drivers/scsi/mpt3sas/mpt3sas_base.c +++ b/drivers/scsi/mpt3sas/mpt3sas_base.c @@ -3344,6 +3344,7 @@ _base_mpi_ep_writeq(__u64 b, volatile void __iomem *addr, spin_lock_irqsave(writeq_lock, flags); writel((u32)(data_out), addr); writel((u32)(data_out >> 32), (addr + 4)); + mmiowb(); spin_unlock_irqrestore(writeq_lock, flags); } -- cgit v1.2.1