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nfp: move indirect block cleanup to flower app stop callback

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The indirect block cleanup may cause control messages to be sent
if offloaded flows are present. However, by the time the flower app
cleanup callback is called txbufs are no longer available and attempts
to send control messages result in a NULL-pointer dereference in
nfp_ctrl_tx_one().

This problem may be resolved by moving the indirect block cleanup
to the stop callback, where txbufs are still available.

As suggested by Jakub Kicinski and Louis Peens.

Fixes: a1db217861f3 ("net: flow_offload: fix flow_indr_dev_unregister path")
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: Louis Peens <louis.peens@netronome.com>
Link: https://lore.kernel.org/r/20201216145701.30005-1-simon.horman@netronome.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Simon Horman 2020-12-16 15:57:01 +01:00 committed by Jakub Kicinski
parent d8a4ea350f
commit 5b33afee93
1 changed files with 3 additions and 3 deletions
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6
drivers/net/ethernet/netronome/nfp/flower/main.c
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@ -860,9 +860,6 @@ static void nfp_flower_clean(struct nfp_app *app)
skb_queue_purge(&app_priv->cmsg_skbs_low);
flush_work(&app_priv->cmsg_work);
flow_indr_dev_unregister(nfp_flower_indr_setup_tc_cb, app,
nfp_flower_setup_indr_tc_release);
if (app_priv->flower_ext_feats & NFP_FL_FEATS_VF_RLIM)
nfp_flower_qos_cleanup(app);
@ -951,6 +948,9 @@ static int nfp_flower_start(struct nfp_app *app)
static void nfp_flower_stop(struct nfp_app *app)
{
nfp_tunnel_config_stop(app);
flow_indr_dev_unregister(nfp_flower_indr_setup_tc_cb, app,
nfp_flower_setup_indr_tc_release);
}
static int