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authorTomas Henzl <thenzl@redhat.com>2018-05-24 17:12:46 +0200
committerMartin K. Petersen <martin.petersen@oracle.com>2018-06-05 21:24:34 -0400
commit10ee1f2206a3f5aa869bede4b7505b24203a7715 (patch)
tree5ed66bd6e3cd1b1c72dbbdcaeca178cd891b2c4a /drivers/scsi/mpt3sas
parent413c2f33489b134e3cc65d9c3ff7861e8fdfe899 (diff)
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 <thenzl@redhat.com> Acked-by: Chaitra P B <chaitra.basappa@broadcom.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/mpt3sas')
-rw-r--r--drivers/scsi/mpt3sas/mpt3sas_base.c1
1 files changed, 1 insertions, 0 deletions
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);
}