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authorAndy Lutomirski <luto@kernel.org>2019-12-23 00:20:50 -0800
committerTheodore Ts'o <tytso@mit.edu>2020-01-07 16:07:01 -0500
commit84df7cdfbb215a34657b39f4257dab739efa2df9 (patch)
tree919196d14c52c8cd704e8269df69dd1ce0a8cbf6 /drivers/char/random.c
parent90ea1c6436d26e62496616fb5891e00819ff4849 (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.c40
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) &&