net: Use NAPI_* in test_bit when stopping napi kthread

napi_stop_kthread waits for the NAPI_STATE_SCHED_THREADED to be unset
before stopping the kthread. But it uses test_bit with the
NAPIF_STATE_SCHED_THREADED and that might stop the kthread early before
the flag is unset.

Use the NAPI_* variant of the NAPI state bits in test_bit instead.

Tested:
 ./tools/testing/selftests/net/nl_netdev.py
 TAP version 13
 1..7
 ok 1 nl_netdev.empty_check
 ok 2 nl_netdev.lo_check
 ok 3 nl_netdev.page_pool_check
 ok 4 nl_netdev.napi_list_check
 ok 5 nl_netdev.dev_set_threaded
 ok 6 nl_netdev.napi_set_threaded
 ok 7 nl_netdev.nsim_rxq_reset_down
 # Totals: pass:7 fail:0 xfail:0 xpass:0 skip:0 error:0

 ./tools/testing/selftests/drivers/net/napi_threaded.py
 TAP version 13
 1..2
 ok 1 napi_threaded.change_num_queues
 ok 2 napi_threaded.enable_dev_threaded_disable_napi_threaded
 # Totals: pass:2 fail:0 xfail:0 xpass:0 skip:0 error:0

Fixes: 689883de94dd ("net: stop napi kthreads when THREADED napi is disabled")
Signed-off-by: Samiullah Khawaja <skhawaja@google.com>
Link: https://patch.msgid.link/20250910203716.1016546-1-skhawaja@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/core/dev.c b/net/core/dev.c
index 93a25d87b86b669c8f8c97ff7811b9371b76472d..8d49b2198d072f154df2022d44155d15ab1aac01 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6965,7 +6965,7 @@ static void napi_stop_kthread(struct napi_struct *napi)
         * the kthread.
         */
        while (true) {
-               if (!test_bit(NAPIF_STATE_SCHED_THREADED, &napi->state))
+               if (!test_bit(NAPI_STATE_SCHED_THREADED, &napi->state))
                        break;
 
                msleep(20);