netdev - [PATCH net] nfp: flower: verify that block cb is not busy before binding

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Date:   Mon, 19 Aug 2019 10:33:04 +0300
From:   Vlad Buslov <vladbu@...lanox.com>
To:     netdev@...r.kernel.org
Cc:     jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
        davem@...emloft.net, jakub.kicinski@...ronome.com,
        pablo@...filter.org, Vlad Buslov <vladbu@...lanox.com>
Subject: [PATCH net] nfp: flower: verify that block cb is not busy before binding

When processing FLOW_BLOCK_BIND command on indirect block, check that flow
block cb is not busy.

Fixes: 0d4fd02e7199 ("net: flow_offload: add flow_block_cb_is_busy() and use it")
Reported-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
Signed-off-by: Vlad Buslov <vladbu@...lanox.com>
---
 drivers/net/ethernet/netronome/nfp/flower/offload.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/netronome/nfp/flower/offload.c b/drivers/net/ethernet/netronome/nfp/flower/offload.c
index e209f150c5f2..9917d64694c6 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/offload.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/offload.c
@@ -1416,6 +1416,13 @@ nfp_flower_setup_indr_tc_block(struct net_device *netdev, struct nfp_app *app,
 
 	switch (f->command) {
 	case FLOW_BLOCK_BIND:
+		cb_priv = nfp_flower_indr_block_cb_priv_lookup(app, netdev);
+		if (cb_priv &&
+		    flow_block_cb_is_busy(nfp_flower_setup_indr_block_cb,
+					  cb_priv,
+					  &nfp_block_cb_list))
+			return -EBUSY;
+
 		cb_priv = kmalloc(sizeof(*cb_priv), GFP_KERNEL);
 		if (!cb_priv)
 			return -ENOMEM;
-- 
2.21.0