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eth: bnxt: fix deadlock in the mgmt_ops

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When queue is being reset, callbacks of mgmt_ops are called by
netdev_nl_bind_rx_doit().
The netdev_nl_bind_rx_doit() first acquires netdev_lock() and then calls
callbacks.
So, mgmt_ops callbacks should not acquire netdev_lock() internaly.

The bnxt_queue_{start | stop}() calls napi_{enable | disable}() but they
internally acquire netdev_lock().
So, deadlock occurs.

To avoid deadlock, napi_{enable | disable}_locked() should be used
instead.

Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Reviewed-by: Michael Chan <michael.chan@broadcom.com>
Fixes: cae03e5bdd ("net: hold netdev instance lock during queue operations")
Link: https://patch.msgid.link/20250402133123.840173-1-ap420073@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Taehee Yoo 2025-04-02 13:31:23 +00:00 committed by Jakub Kicinski
parent e5ddf19dbc
commit e4546c6498
1 changed files with 3 additions and 3 deletions
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6
drivers/net/ethernet/broadcom/bnxt/bnxt.c
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@ -15909,7 +15909,7 @@ static int bnxt_queue_start(struct net_device *dev, void *qmem, int idx)
goto err_reset;
}
napi_enable(&bnapi->napi);
napi_enable_locked(&bnapi->napi);
bnxt_db_nq_arm(bp, &cpr->cp_db, cpr->cp_raw_cons);
for (i = 0; i < bp->nr_vnics; i++) {
@ -15931,7 +15931,7 @@ static int bnxt_queue_start(struct net_device *dev, void *qmem, int idx)
err_reset:
netdev_err(bp->dev, "Unexpected HWRM error during queue start rc: %d\n",
rc);
napi_enable(&bnapi->napi);
napi_enable_locked(&bnapi->napi);
bnxt_db_nq_arm(bp, &cpr->cp_db, cpr->cp_raw_cons);
bnxt_reset_task(bp, true);
return rc;
@ -15971,7 +15971,7 @@ static int bnxt_queue_stop(struct net_device *dev, void *qmem, int idx)
* completion is handled in NAPI to guarantee no more DMA on that ring
* after seeing the completion.
*/
napi_disable(&bnapi->napi);
napi_disable_locked(&bnapi->napi);
if (bp->tph_mode) {
bnxt_hwrm_cp_ring_free(bp, rxr->rx_cpr);