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| author | Stephen Hemminger <shemminger@linux-foundation.org> | 2007-10-17 13:26:41 -0700 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2007-10-17 20:17:34 -0400 |
| commit | c264c3dee9f20bad1f42ef5821300791291d0f77 (patch) | |
| tree | cbd106e8e69163032ab6346672a7cefe1b39da2b | |
| parent | a7475906bc496456ded9e4b062f94067fb93057a (diff) | |
napi_synchronize: waiting for NAPI
Some drivers with shared NAPI need a synchronization barrier.
Also suggested by Benjamin Herrenschmidt for EMAC.
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
| -rw-r--r-- | include/linux/netdevice.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 39dd83b183a..a5e2dc1f0d9 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -407,6 +407,24 @@ static inline void napi_enable(struct napi_struct *n) clear_bit(NAPI_STATE_SCHED, &n->state); } +#ifdef CONFIG_SMP +/** + * napi_synchronize - wait until NAPI is not running + * @n: napi context + * + * Wait until NAPI is done being scheduled on this context. + * Waits till any outstanding processing completes but + * does not disable future activations. + */ +static inline void napi_synchronize(const struct napi_struct *n) +{ + while (test_bit(NAPI_STATE_SCHED, &n->state)) + msleep(1); +} +#else +# define napi_synchronize(n) barrier() +#endif + /* * The DEVICE structure. * Actually, this whole structure is a big mistake. It mixes I/O |