| Message ID | 1272481235.2549.14.camel@achroite.uk.solarflarecom.com |
|---|---|
| State | Accepted, archived |
| Delegated to: | David Miller |
| Headers | show |
From: Ben Hutchings <bhutchings@solarflare.com> Date: Wed, 28 Apr 2010 20:00:35 +0100 > The original code would wait indefinitely if MAC stats DMA failed. > > Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> > Cc: stable@kernel.org Applied. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/net/sfc/siena.c b/drivers/net/sfc/siena.c index 38dcc42..e0c46f5 100644 --- a/drivers/net/sfc/siena.c +++ b/drivers/net/sfc/siena.c @@ -456,8 +456,17 @@ 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)
The original code would wait indefinitely if MAC stats DMA failed. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> Cc: stable@kernel.org --- drivers/net/sfc/siena.c | 13 +++++++++++-- 1 files changed, 11 insertions(+), 2 deletions(-)