Michael S. Tsirkin wrote:
I'm still looking at isolating this failure. I'd like to understand the new
code better, however. What prevents ipoib_mcast_leave and later
ipoib_mcast_free from being called on an mcast that has an outstanding query?
We used to have a completion to signal that but it seems to be gone.
The multicast module requires a call to ib_free_multicast() after
ib_join_multicast() has been called. It doesn't matter when ib_free_multicast()
is called, but it is a blocking call. After ib_free_multicast() returns, the
user's callback will not be invoked. Any synchronization issues, such as
leaving a group while it has an outstanding query, are pushed into the multicast
module. This is necessary to serialize join and leave requests from multiple
users on the same group.
- Sean
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