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scsi: mpt3sas: Add an I/O barrier

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

Signed-off-by: Tomas Henzl <thenzl@redhat.com>
Acked-by: Chaitra P B <chaitra.basappa@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Tomas Henzl 2018-05-24 17:12:46 +02:00 committed by Martin K. Petersen
parent 413c2f3348
commit 10ee1f2206
1 changed files with 1 additions and 0 deletions
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drivers/scsi/mpt3sas/mpt3sas_base.c
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@ -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);
}