Differential D56288 Diff 175407 sys/net/if.c

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sys/net/if.c

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{		{
struct ifnet ifp, nifp;		struct ifnet ifp, nifp;
struct ifnet **pending;		struct ifnet **pending;
int found __diagused;		int found __diagused;
int i;		int i;

i = 0;		i = 0;

		/* The lock has already been aquired in vnet_destroy() */
		sx_assert(&ifnet_detach_sxlock, SX_XLOCKED);
/*		/*
* We need to protect our access to the V_ifnet tailq. Ordinarily we'd		* We need to protect our access to the V_ifnet tailq. Ordinarily we'd
* enter NET_EPOCH, but that's not possible, because if_vmove() calls		* enter NET_EPOCH, but that's not possible, because if_vmove() calls
* if_detach_internal(), which waits for NET_EPOCH callbacks to		* if_detach_internal(), which waits for NET_EPOCH callbacks to
* complete. We can't do that from within NET_EPOCH.		* complete. We can't do that from within NET_EPOCH.
*		*
* However, we can also use the IFNET_xLOCK, which is the V_ifnet		* However, we can also use the IFNET_xLOCK, which is the V_ifnet
* read/write lock. We cannot hold the lock as we call if_vmove()		* read/write lock. We cannot hold the lock as we call if_vmove()
Show All 12 Lines	if (ifp->if_home_vnet != ifp->if_vnet) {
MPASS(found);		MPASS(found);

pending[i++] = ifp;		pending[i++] = ifp;
}		}
}		}
IFNET_WUNLOCK();		IFNET_WUNLOCK();

for (int j = 0; j < i; j++) {		for (int j = 0; j < i; j++) {
sx_xlock(&ifnet_detach_sxlock);
if_vmove(pending[j], pending[j]->if_home_vnet);		if_vmove(pending[j], pending[j]->if_home_vnet);
sx_xunlock(&ifnet_detach_sxlock);
}		}

free(pending, M_IFNET);		free(pending, M_IFNET);
}		}
VNET_SYSUNINIT(vnet_if_return, SI_SUB_VNET_DONE, SI_ORDER_ANY,		VNET_SYSUNINIT(vnet_if_return, SI_SUB_VNET_DONE, SI_ORDER_ANY,
vnet_if_return, NULL);		vnet_if_return, NULL);
#endif		#endif

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