random: initialize the non-blocking pool via add_hwgenerator_randomness()
If we have a hardware RNG and are using the in-kernel rngd, we should use this to initialize the non-blocking pool so that getrandom(2) doesn't block unnecessarily. Cc: stable@kernel.org Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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@ -1849,12 +1849,18 @@ void add_hwgenerator_randomness(const char *buffer, size_t count,
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{
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struct entropy_store *poolp = &input_pool;
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/* Suspend writing if we're above the trickle threshold.
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* We'll be woken up again once below random_write_wakeup_thresh,
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* or when the calling thread is about to terminate.
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*/
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wait_event_interruptible(random_write_wait, kthread_should_stop() ||
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if (unlikely(nonblocking_pool.initialized == 0))
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poolp = &nonblocking_pool;
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else {
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/* Suspend writing if we're above the trickle
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* threshold. We'll be woken up again once below
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* random_write_wakeup_thresh, or when the calling
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* thread is about to terminate.
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*/
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wait_event_interruptible(random_write_wait,
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kthread_should_stop() ||
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ENTROPY_BITS(&input_pool) <= random_write_wakeup_bits);
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}
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mix_pool_bytes(poolp, buffer, count);
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credit_entropy_bits(poolp, entropy);
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}
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