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Commit c264c3de authored by Stephen Hemminger's avatar Stephen Hemminger Committed by Jeff Garzik
Browse files

napi_synchronize: waiting for NAPI 



Some drivers with shared NAPI need a synchronization barrier.
Also suggested by Benjamin Herrenschmidt for EMAC.

Signed-off-by: default avatarStephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent a7475906

include/linux/netdevice.h

+18 −0
Original line number Diff line number Diff line
@@ -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