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net: fix napi_disable() logic error

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Dan reported a new warning after my recent patch:

New smatch warnings:
net/core/dev.c:6409 napi_disable() error: uninitialized symbol 'new'.

Indeed, we must first wait for STATE_SCHED and STATE_NPSVC to be cleared,
to make sure @new variable has been initialized properly.

Fixes: 4ffa1d1c68 ("net: adopt try_cmpxchg() in napi_{enable|disable}()")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2022-11-17 09:26:41 +00:00 • committed by David S. Miller
parent 3846189483
commit fd896e38e5
1 changed files with 2 additions and 2 deletions
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4
net/core/dev.c
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@ -6399,9 +6399,9 @@ void napi_disable(struct napi_struct *n)
val = READ_ONCE(n->state); val = READ_ONCE(n->state);
do { do {
if (val & (NAPIF_STATE_SCHED | NAPIF_STATE_NPSVC)) { while (val & (NAPIF_STATE_SCHED | NAPIF_STATE_NPSVC)) {
usleep_range(20, 200); usleep_range(20, 200);
continue; val = READ_ONCE(n->state);
} }
new = val | NAPIF_STATE_SCHED | NAPIF_STATE_NPSVC; new = val | NAPIF_STATE_SCHED | NAPIF_STATE_NPSVC;