[PATCH net-next] ibmvnic: substitute mb() with dma_wmb() for send_*crq* functions

[Lijun Pan]

The CRQ and subCRQ descriptors are DMA mapped, so dma_wmb(),
though weaker, is good enough to protect the data structures.

Signed-off-by: Lijun Pan <l...@linux.ibm.com>
Acked-by: Thomas Falcon <tlfal...@linux.ibm.com>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c 
b/drivers/net/ethernet/ibm/ibmvnic.c
index 7a5e589e7223..927d5f36d308 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -3599,7 +3599,7 @@ static int send_subcrq_indirect(struct ibmvnic_adapter 
*adapter,
        int rc;
 
        /* Make sure the hypervisor sees the complete request */
-       mb();
+       dma_wmb();
        rc = plpar_hcall_norets(H_SEND_SUB_CRQ_INDIRECT, ua,
                                cpu_to_be64(remote_handle),
                                ioba, num_entries);
@@ -3629,7 +3629,7 @@ static int ibmvnic_send_crq(struct ibmvnic_adapter 
*adapter,
        }
 
        /* Make sure the hypervisor sees the complete request */
-       mb();
+       dma_wmb();
 
        rc = plpar_hcall_norets(H_SEND_CRQ, ua,
                                cpu_to_be64(u64_crq[0]),
-- 
2.23.0