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dad72a1d28
With the recent introduction of per-channel tasklet, we need to update
the way we handle the 3 concurrency issues:
1. hv_process_channel_removal -> percpu_channel_deq vs.
vmbus_chan_sched -> list_for_each_entry(..., percpu_list);
2. vmbus_process_offer -> percpu_channel_enq/deq vs. vmbus_chan_sched.
3. vmbus_close_internal vs. the per-channel tasklet vmbus_on_event;
The first 2 issues can be handled by Stephen's recent patch
"vmbus: use rcu for per-cpu channel list", and the third issue
can be handled by calling tasklet_disable in vmbus_close_internal here.
We don't need the original hv_event_tasklet_disable/enable since we
now use per-channel tasklet instead of the previous per-CPU tasklet,
and actually we must remove them due to the side effect now:
vmbus_process_offer -> hv_event_tasklet_enable -> tasklet_schedule will
start the per-channel callback prematurely, cauing NULL dereferencing
(the channel may haven't been properly configured to run the callback yet).
Fixes:
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.. | ||
channel.c | ||
channel_mgmt.c | ||
connection.c | ||
hv.c | ||
hv_balloon.c | ||
hv_fcopy.c | ||
hv_kvp.c | ||
hv_snapshot.c | ||
hv_util.c | ||
hv_utils_transport.c | ||
hv_utils_transport.h | ||
hyperv_vmbus.h | ||
Kconfig | ||
Makefile | ||
ring_buffer.c | ||
vmbus_drv.c |