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ibmveth: Use lighter weight read memory barrier in ibmveth_poll

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We want to order the read in ibmveth_rxq_pending_buffer and the read of
ibmveth_rxq_buffer_valid which are both cacheable memory. smp_rmb() is good
enough for this.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Santiago Leon <santil@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Anton Blanchard
2010-09-06 18:21:41 -07:00
committed by David S. Miller
parent 8d86c61ae4
commit f89e49e79f
1 changed files with 1 additions and 1 deletions
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drivers/net/ibmveth.c
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@@ -1010,7 +1010,7 @@ static int ibmveth_poll(struct napi_struct *napi, int budget)
if (!ibmveth_rxq_pending_buffer(adapter)) if (!ibmveth_rxq_pending_buffer(adapter))
break; break;
rmb(); smp_rmb();
if (!ibmveth_rxq_buffer_valid(adapter)) { if (!ibmveth_rxq_buffer_valid(adapter)) {
wmb(); /* suggested by larson1 */ wmb(); /* suggested by larson1 */
adapter->rx_invalid_buffer++; adapter->rx_invalid_buffer++;