diff options
| author | Andy Lutomirski <luto@kernel.org> | 2019-12-23 00:20:50 -0800 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2020-01-07 16:07:01 -0500 |
| commit | 84df7cdfbb215a34657b39f4257dab739efa2df9 (patch) | |
| tree | 919196d14c52c8cd704e8269df69dd1ce0a8cbf6 /drivers/char/random.c | |
| parent | 90ea1c6436d26e62496616fb5891e00819ff4849 (diff) | |
random: delete code to pull data into pools
There is no pool that pulls, so it was just dead code.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Link: https://lore.kernel.org/r/4a05fe0c7a5c831389ef4aea51d24528ac8682c7.1577088521.git.luto@kernel.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'drivers/char/random.c')
| -rw-r--r-- | drivers/char/random.c | 40 |
1 files changed, 0 insertions, 40 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c index daf48f3f8cde..1a36a594dc2e 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -528,10 +528,8 @@ struct entropy_store { const struct poolinfo *poolinfo; __u32 *pool; const char *name; - struct entropy_store *pull; /* read-write data: */ - unsigned long last_pulled; spinlock_t lock; unsigned short add_ptr; unsigned short input_rotate; @@ -1348,41 +1346,6 @@ EXPORT_SYMBOL_GPL(add_disk_randomness); *********************************************************************/ /* - * This utility inline function is responsible for transferring entropy - * from the primary pool to the secondary extraction pool. We make - * sure we pull enough for a 'catastrophic reseed'. - */ -static void _xfer_secondary_pool(struct entropy_store *r, size_t nbytes); -static void xfer_secondary_pool(struct entropy_store *r, size_t nbytes) -{ - if (!r->pull || - r->entropy_count >= (nbytes << (ENTROPY_SHIFT + 3)) || - r->entropy_count > r->poolinfo->poolfracbits) - return; - - _xfer_secondary_pool(r, nbytes); -} - -static void _xfer_secondary_pool(struct entropy_store *r, size_t nbytes) -{ - __u32 tmp[OUTPUT_POOL_WORDS]; - - int bytes = nbytes; - - /* pull at least as much as a wakeup */ - bytes = max_t(int, bytes, random_read_wakeup_bits / 8); - /* but never more than the buffer size */ - bytes = min_t(int, bytes, sizeof(tmp)); - - trace_xfer_secondary_pool(r->name, bytes * 8, nbytes * 8, - ENTROPY_BITS(r), ENTROPY_BITS(r->pull)); - bytes = extract_entropy(r->pull, tmp, bytes, - random_read_wakeup_bits / 8, 0); - mix_pool_bytes(r, tmp, bytes); - credit_entropy_bits(r, bytes*8); -} - -/* * This function decides how many bytes to actually take from the * given pool, and also debits the entropy count accordingly. */ @@ -1545,7 +1508,6 @@ static ssize_t extract_entropy(struct entropy_store *r, void *buf, spin_unlock_irqrestore(&r->lock, flags); trace_extract_entropy(r->name, EXTRACT_SIZE, ENTROPY_BITS(r), _RET_IP_); - xfer_secondary_pool(r, EXTRACT_SIZE); extract_buf(r, tmp); spin_lock_irqsave(&r->lock, flags); memcpy(r->last_data, tmp, EXTRACT_SIZE); @@ -1554,7 +1516,6 @@ static ssize_t extract_entropy(struct entropy_store *r, void *buf, } trace_extract_entropy(r->name, nbytes, ENTROPY_BITS(r), _RET_IP_); - xfer_secondary_pool(r, nbytes); nbytes = account(r, nbytes, min, reserved); return _extract_entropy(r, buf, nbytes, fips_enabled); @@ -1826,7 +1787,6 @@ static void __init init_std_data(struct entropy_store *r) ktime_t now = ktime_get_real(); unsigned long rv; - r->last_pulled = jiffies; mix_pool_bytes(r, &now, sizeof(now)); for (i = r->poolinfo->poolbytes; i > 0; i -= sizeof(rv)) { if (!arch_get_random_seed_long(&rv) && |