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In xennet_xenbus_detach(), remove the event handler early (just after 

xennet_stop()) so that we don't get events while slepping (e.g.
in softint_disestablish()) when some structures have already been
freed.
Problem reported and patch tested by Rohan Desai.
This commit is contained in:
bouyer 2016-02-16 08:41:32 +00:00
parent 970a1b8e99
commit f35e6799e0
1 changed files with 3 additions and 3 deletions
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6
sys/arch/xen/xen/if_xennet_xenbus.c
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@ -1,4 +1,4 @@
/* $NetBSD: if_xennet_xenbus.c,v 1.66 2016/02/09 08:32:10 ozaki-r Exp $ */
/* $NetBSD: if_xennet_xenbus.c,v 1.67 2016/02/16 08:41:32 bouyer Exp $ */
/*
* Copyright (c) 2006 Manuel Bouyer.
@ -85,7 +85,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_xennet_xenbus.c,v 1.66 2016/02/09 08:32:10 ozaki-r Exp $");
__KERNEL_RCSID(0, "$NetBSD: if_xennet_xenbus.c,v 1.67 2016/02/16 08:41:32 bouyer Exp $");
#include "opt_xen.h"
#include "opt_nfs_boot.h"
@ -422,6 +422,7 @@ xennet_xenbus_detach(device_t self, int flags)
DPRINTF(("%s: xennet_xenbus_detach\n", device_xname(self)));
s0 = splnet();
xennet_stop(ifp, 1);
event_remove_handler(sc->sc_evtchn, &xennet_handler, sc);
/* wait for pending TX to complete, and collect pending RX packets */
xennet_handler(sc);
while (sc->sc_tx_ring.sring->rsp_prod != sc->sc_tx_ring.rsp_cons) {
@ -457,7 +458,6 @@ xennet_xenbus_detach(device_t self, int flags)
uvm_km_free(kernel_map, (vaddr_t)sc->sc_rx_ring.sring, PAGE_SIZE,
UVM_KMF_WIRED);
softint_disestablish(sc->sc_softintr);
event_remove_handler(sc->sc_evtchn, &xennet_handler, sc);
splx(s0);
pmf_device_deregister(self);