1c0453d64a
We needed the mcast_mutex when we had to prevent the join completion callback from having the value it stored in mcast->mc overwritten by a delayed return from ib_sa_join_multicast. By storing the return of ib_sa_join_multicast in an intermediate variable, we prevent a delayed return from ib_sa_join_multicast overwriting the valid contents of mcast->mc, and we no longer need a mutex to force the join callback to run after the return of ib_sa_join_multicast. This allows us to do away with the mutex entirely and protect our critical sections with a just a spinlock instead. This is highly desirable as there were some places where we couldn't use a mutex because the code was not allowed to sleep, and so we were currently using a mix of mutex and spinlock to protect what we needed to protect. Now we only have a spin lock and the locking complexity is greatly reduced. Signed-off-by: Doug Ledford <dledford@redhat.com> |
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