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path: root/drivers/net/sfc/siena.c
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Diffstat (limited to 'drivers/net/sfc/siena.c')
-rw-r--r--drivers/net/sfc/siena.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/net/sfc/siena.c b/drivers/net/sfc/siena.c
index 1619fb5a64f..e0c46f59d1f 100644
--- a/drivers/net/sfc/siena.c
+++ b/drivers/net/sfc/siena.c
@@ -12,6 +12,7 @@
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/module.h>
+#include <linux/slab.h>
#include "net_driver.h"
#include "bitfield.h"
#include "efx.h"
@@ -455,8 +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)