diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2010-05-10 11:59:37 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2010-05-10 14:20:42 +0200 |
| commit | dbb6be6d5e974c42bbecd183effaa0df69e1dd8b (patch) | |
| tree | 5735cb47e70853d057a9881dd0ce44b83e88fa63 /drivers/net/sfc/siena.c | |
| parent | 6a867a395558a7f882d041783e4cdea6744ca2bf (diff) | |
| parent | b57f95a38233a2e73b679bea4a5453a1cc2a1cc9 (diff) | |
Merge branch 'linus' into timers/core
Reason: Further posix_cpu_timer patches depend on mainline changes
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/net/sfc/siena.c')
| -rw-r--r-- | drivers/net/sfc/siena.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/net/sfc/siena.c b/drivers/net/sfc/siena.c index 1619fb5a64f5..e0c46f59d1f8 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) |