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sfc: Add rmb() between reading stats and generation count to ensure consistency 

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Jon Cooper 2013-09-27 18:26:30 +01:00 committed by Ben Hutchings
parent 5e8a402f83
commit d546a89362
1 changed files with 1 additions and 0 deletions
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1
drivers/net/ethernet/sfc/ef10.c
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@ -545,6 +545,7 @@ static int efx_ef10_try_update_nic_stats(struct efx_nic *efx)
rmb(); rmb();
efx_nic_update_stats(efx_ef10_stat_desc, EF10_STAT_COUNT, stats_mask, efx_nic_update_stats(efx_ef10_stat_desc, EF10_STAT_COUNT, stats_mask,
stats, efx->stats_buffer.addr, false); stats, efx->stats_buffer.addr, false);
rmb();
generation_start = dma_stats[MC_CMD_MAC_GENERATION_START]; generation_start = dma_stats[MC_CMD_MAC_GENERATION_START];
if (generation_end != generation_start) if (generation_end != generation_start)
return -EAGAIN; return -EAGAIN;