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ibmvnic: substitute mb() with dma_wmb() for send_*crq* functions

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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 <ljp@linux.ibm.com>
Acked-by: Thomas Falcon <tlfalcon@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lijun Pan 2021-02-12 20:36:46 -06:00 committed by David S. Miller
parent 1c7d45e7b2
commit 1a42156f52
1 changed files with 2 additions and 2 deletions
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4
drivers/net/ethernet/ibm/ibmvnic.c
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@ -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]),