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[net,1/6] sfc: Add rmb() between reading stats and generation count to ensure consistency

Message ID 1381254200.1530.11.camel@bwh-desktop.uk.level5networks.com
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Ben Hutchings Oct. 8, 2013, 5:43 p.m. UTC 
From: Jon Cooper <jcooper@solarflare.com>

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
---
 drivers/net/ethernet/sfc/ef10.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c
index 9f18ae9..a4fbb38 100644
--- a/drivers/net/ethernet/sfc/ef10.c
+++ b/drivers/net/ethernet/sfc/ef10.c
@@ -545,6 +545,7 @@  static int efx_ef10_try_update_nic_stats(struct efx_nic *efx)
 	rmb();
 	efx_nic_update_stats(efx_ef10_stat_desc, EF10_STAT_COUNT, stats_mask,
 			     stats, efx->stats_buffer.addr, false);
+	rmb();
 	generation_start = dma_stats[MC_CMD_MAC_GENERATION_START];
 	if (generation_end != generation_start)
 		return -EAGAIN;