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RDMA connection shutdown on an SMP machine can cause a kernel crash due to the transport close path racing with the I/O tasklet. Additional transport references were added as follows: - A reference when on the DTO Q to avoid having the transport deleted while queued for I/O. - A reference while there is a QP able to generate events. - A reference until the DISCONNECTED event is received on the CM ID Signed-off-by: Tom Tucker <tom@opengridcomputing.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>