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| author | David S. Miller <davem@davemloft.net> | 2010-05-02 21:43:40 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-05-02 22:02:06 -0700 |
| commit | 7ef527377b88ff05fb122a47619ea506c631c914 (patch) | |
| tree | 2c2e774527d5f591b975834f43e8c6fd12fb38f2 /drivers/net/sfc/siena.c | |
| parent | 47d29646a2c1c147d8a7598aeac2c87dd71ed638 (diff) | |
| parent | 1183f3838c588545592c042c0ce15015661ce7f2 (diff) | |
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
Diffstat (limited to 'drivers/net/sfc/siena.c')
| -rw-r--r-- | drivers/net/sfc/siena.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/net/sfc/siena.c b/drivers/net/sfc/siena.c index 7bf93faff3a..727b4228e08 100644 --- a/drivers/net/sfc/siena.c +++ b/drivers/net/sfc/siena.c @@ -475,8 +475,17 @@ static int siena_try_update_nic_stats(struct efx_nic *efx) static void siena_update_nic_stats(struct efx_nic *efx) { - while (siena_try_update_nic_stats(efx) == -EAGAIN) - cpu_relax(); + int retry; + + /* If we're unlucky enough to read statistics wduring the DMA, wait + * up to 10ms for it to finish (typically takes <500us) */ + for (retry = 0; retry < 100; ++retry) { + if (siena_try_update_nic_stats(efx) == 0) + return; + udelay(100); + } + + /* Use the old values instead */ } static void siena_start_nic_stats(struct efx_nic *efx) |