rdma: Autoload netlink client modules

If a message comes in and we do not have the client in the table, then
try to load the module supplying that client using MODULE_ALIAS to find
it.

This duplicates the scheme seen in other netlink muxes (eg nfnetlink).

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/infiniband/core/netlink.c b/drivers/infiniband/core/netlink.c
index f782697cf4d8..e685148dd3e6 100644
--- a/drivers/infiniband/core/netlink.c
+++ b/drivers/infiniband/core/netlink.c
@@ -84,6 +84,15 @@ static bool is_nl_valid(unsigned int type, unsigned int op)
                 return false;
 
         cb_table = rdma_nl_types[type].cb_table;
+#ifdef CONFIG_MODULES
+        if (!cb_table) {
+                mutex_unlock(&rdma_nl_mutex);
+                request_module("rdma-netlink-subsys-%d", type);
+                mutex_lock(&rdma_nl_mutex);
+                cb_table = rdma_nl_types[type].cb_table;
+        }
+#endif
+
         if (!cb_table || (!cb_table[op].dump && !cb_table[op].doit))
                 return false;
         return true;