[PATCH 5.3 131/193] RDMA/nldev: Skip counter if port doesnt match

[Greg Kroah-Hartman]

From: Mark Zhang <markz@xxxxxxxxxxxx>

[ Upstream commit a15542bb72a48042f5df7475893d46f725f5f9fb ]

The counter resource should return -EAGAIN if it was requested for a
different port, this is similar to how QP works if the users provides a
port filter.

Otherwise port filtering in netlink will return broken counter nests.

Fixes: c4ffee7c9bdb ("RDMA/netlink: Implement counter dumpit calback")
Link: https://lore.kernel.org/r/20191020062800.8065-1-leon@xxxxxxxxxx
Signed-off-by: Mark Zhang <markz@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/infiniband/core/nldev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/nldev.c b/drivers/infiniband/core/nldev.c
index f42e856f30729..4300e21865845 100644
--- a/drivers/infiniband/core/nldev.c
+++ b/drivers/infiniband/core/nldev.c
@@ -778,7 +778,7 @@ static int fill_res_counter_entry(struct sk_buff *msg, bool has_cap_net_admin,
 		container_of(res, struct rdma_counter, res);
 
 	if (port && port != counter->port)
-		return 0;
+		return -EAGAIN;
 
 	/* Dump it even query failed */
 	rdma_counter_query_stats(counter);
-- 
2.20.1