David Vrabel 3e55f8b306 xen-netback: cancel the credit timer when taking the vif down ... If the credit timer is left armed after calling xen_netbk_remove_xenvif(), then it may fire and attempt to schedule the vif which will then oops as vif->netbk == NULL. This may happen both in the fatal error path and during normal disconnection from the front end. The sequencing during shutdown is critical to ensure that: a) vif->netbk doesn't become unexpectedly NULL; and b) the net device/vif is not freed. 1. Mark as unschedulable (netif_carrier_off()). 2. Synchronously cancel the timer. 3. Remove the vif from the schedule list. 4. Remove it from it netback thread group. 5. Wait for vif->refcnt to become 0. Signed-off-by: David Vrabel <david.vrabel@citrix.com> Acked-by: Ian Campbell <ian.campbell@citrix.com> Reported-by: Christopher S. Aker <caker@theshore.net> Signed-off-by: David S. Miller <davem@davemloft.net>		2013-02-14 13:16:49 -05:00
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common.h	xen/netback: shutdown the ring if it contains garbage.	2013-02-07 23:29:28 -05:00
interface.c	xen-netback: cancel the credit timer when taking the vif down	2013-02-14 13:16:49 -05:00
Makefile	xen network backend driver	2011-03-15 19:38:03 -07:00
netback.c	xen-netback: correctly return errors from netbk_count_requests()	2013-02-14 13:16:49 -05:00
xenbus.c	Xen: consolidate and simplify struct xenbus_driver instantiation	2012-01-04 17:01:17 -05:00