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| author | Jason A. Donenfeld <Jason@zx2c4.com> | 2022-11-06 16:02:43 +0100 |
|---|---|---|
| committer | Jason A. Donenfeld <Jason@zx2c4.com> | 2022-11-18 02:18:10 +0100 |
| commit | db516da95ce458f0cab5e7ae2db93fd821484d7d (patch) | |
| tree | 7025999d032360dfcd0f5dc4c772f5206dff0fd0 /drivers/char/hw_random/core.c | |
| parent | 19258d05b619d26622bdcfa11eca1f457b69e4da (diff) | |
| download | linux-db516da95ce458f0cab5e7ae2db93fd821484d7d.tar.gz | |
hw_random: use add_hwgenerator_randomness() for early entropy
Rather than calling add_device_randomness(), the add_early_randomness()
function should use add_hwgenerator_randomness(), so that the early
entropy can be potentially credited, which allows for the RNG to
initialize earlier without having to wait for the kthread to come up.
This requires some minor API refactoring, by adding a `sleep_after`
parameter to add_hwgenerator_randomness(), so that we don't hit a
blocking sleep from add_early_randomness().
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Diffstat (limited to 'drivers/char/hw_random/core.c')
| -rw-r--r-- | drivers/char/hw_random/core.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c index cc002b0c2f0c38..63a0a8e4505d2b 100644 --- a/drivers/char/hw_random/core.c +++ b/drivers/char/hw_random/core.c @@ -69,8 +69,10 @@ static void add_early_randomness(struct hwrng *rng) mutex_lock(&reading_mutex); bytes_read = rng_get_data(rng, rng_fillbuf, 32, 0); mutex_unlock(&reading_mutex); - if (bytes_read > 0) - add_device_randomness(rng_fillbuf, bytes_read); + if (bytes_read > 0) { + size_t entropy = bytes_read * 8 * rng->quality / 1024; + add_hwgenerator_randomness(rng_fillbuf, bytes_read, entropy, false); + } } static inline void cleanup_rng(struct kref *kref) @@ -528,7 +530,7 @@ static int hwrng_fillfn(void *unused) /* Outside lock, sure, but y'know: randomness. */ add_hwgenerator_randomness((void *)rng_fillbuf, rc, - entropy >> 10); + entropy >> 10, true); } hwrng_fill = NULL; return 0; |