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futex: Avoid unnecessary lock

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It is not necessary the spin lock to protect atomic operation.

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
This commit is contained in:
Flavio Ceolin 2021-07-08 17:13:29 -07:00 • committed by Christopher Friedt
commit f2e323f06c
1 changed files with 2 additions and 3 deletions
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5
kernel/futex.c
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@ -74,13 +74,12 @@ int z_impl_k_futex_wait(struct k_futex *futex, int expected,
return -EINVAL;
}
key = k_spin_lock(&futex_data->lock);
if (atomic_get(&futex->val) != (atomic_val_t)expected) {
k_spin_unlock(&futex_data->lock, key);
return -EAGAIN;
}
key = k_spin_lock(&futex_data->lock);
ret = z_pend_curr(&futex_data->lock,
key, &futex_data->wait_q, timeout);
if (ret == -EAGAIN) {