[PATCH] mpt3sas: Add an i/o barrier

[Tomas Henzl]

A barrier should be added to ensure proper ordering of memory mapped
writes.

Signed-off-by: Tomas Henzl <the...@redhat.com>
---
 drivers/scsi/mpt3sas/mpt3sas_base.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c 
b/drivers/scsi/mpt3sas/mpt3sas_base.c
index bf04fa90f..569392d0d 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
@@ -3348,6 +3348,7 @@ _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);
 }
 
-- 
2.14.3