rds: Avoid flushing MRs in rds_rdma_drop_keys

When an rds socket is released, it calls rds_rdma_drop_keys() to release all
the associated MRs. This function calls MR flush function which flushes MR
pools of all IB devices. When the application releases multiple rds sockets
at the same time, processes get stuck in 'D' state and causes application
time outs. This fix removes calling flush_mrs() from rds_rdma_drop_keys().
The alloc_mr takes care of flushing when no MR is available.

Orabug: 30903882

Signed-off-by: aru kolappan <[email protected]>
Reviewed-by: Ka-Cheong Poon <[email protected]>
Signed-off-by: Somasundaram Krishnasamy <[email protected]>

Author: aru kolappan

net/rds/rdma.c

@@ -150,9 +150,6 @@ void rds_rdma_drop_keys(struct rds_sock *rs)
 		spin_lock_irqsave(&rs->rs_rdma_lock, flags);
 	}
 	spin_unlock_irqrestore(&rs->rs_rdma_lock, flags);
-
-	if (rs->rs_transport && rs->rs_transport->flush_mrs)
-		rs->rs_transport->flush_mrs();
 }
 EXPORT_SYMBOL_GPL(rds_rdma_drop_keys);