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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>
This commit is contained in:
Stephen Hemminger 2007-10-17 13:26:41 -07:00 committed by Jeff Garzik
parent a7475906bc
commit c264c3dee9
1 changed files with 18 additions and 0 deletions
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18
include/linux/netdevice.h
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@ -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