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authorStephan Müller <smueller@chronox.de>2016-12-27 23:40:59 +0100
committerTheodore Ts'o <tytso@mit.edu>2017-01-18 21:54:15 -0500
commit43d8a72cd985ca5279a9eb84d61fcbb3ee3d3774 (patch)
treefafb655467444e577fc4ff789a7bf2af9ddba45c /drivers/char/random.c
parent2e03c36f25ebb52d3358b8baebcdf96895c33a87 (diff)
downloadleg-kernel-43d8a72cd985ca5279a9eb84d61fcbb3ee3d3774.tar.gz
random: remove variable limit
The variable limit was used to identify the nonblocking pool's unlimited random number generation. As the nonblocking pool is a thing of the past, remove the limit variable and any conditions around it (i.e. preserve the branches for limit == 1). Signed-off-by: Stephan Mueller <smueller@chronox.de> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'drivers/char/random.c')
-rw-r--r--drivers/char/random.c30
1 files changed, 7 insertions, 23 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c
index 482531d87fb8..92d6dd24c86e 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -466,7 +466,6 @@ struct entropy_store {
int entropy_count;
int entropy_total;
unsigned int initialized:1;
- unsigned int limit:1;
unsigned int last_data_init:1;
__u8 last_data[EXTRACT_SIZE];
};
@@ -484,7 +483,6 @@ static __u32 blocking_pool_data[OUTPUT_POOL_WORDS] __latent_entropy;
static struct entropy_store input_pool = {
.poolinfo = &poolinfo_table[0],
.name = "input",
- .limit = 1,
.lock = __SPIN_LOCK_UNLOCKED(input_pool.lock),
.pool = input_pool_data
};
@@ -492,7 +490,6 @@ static struct entropy_store input_pool = {
static struct entropy_store blocking_pool = {
.poolinfo = &poolinfo_table[1],
.name = "blocking",
- .limit = 1,
.pull = &input_pool,
.lock = __SPIN_LOCK_UNLOCKED(blocking_pool.lock),
.pool = blocking_pool_data,
@@ -1212,15 +1209,6 @@ static void xfer_secondary_pool(struct entropy_store *r, size_t nbytes)
r->entropy_count > r->poolinfo->poolfracbits)
return;
- if (r->limit == 0 && random_min_urandom_seed) {
- unsigned long now = jiffies;
-
- if (time_before(now,
- r->last_pulled + random_min_urandom_seed * HZ))
- return;
- r->last_pulled = now;
- }
-
_xfer_secondary_pool(r, nbytes);
}
@@ -1228,8 +1216,6 @@ static void _xfer_secondary_pool(struct entropy_store *r, size_t nbytes)
{
__u32 tmp[OUTPUT_POOL_WORDS];
- /* For /dev/random's pool, always leave two wakeups' worth */
- int rsvd_bytes = r->limit ? 0 : random_read_wakeup_bits / 4;
int bytes = nbytes;
/* pull at least as much as a wakeup */
@@ -1240,7 +1226,7 @@ static void _xfer_secondary_pool(struct entropy_store *r, size_t nbytes)
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, rsvd_bytes);
+ random_read_wakeup_bits / 8, 0);
mix_pool_bytes(r, tmp, bytes);
credit_entropy_bits(r, bytes*8);
}
@@ -1268,7 +1254,7 @@ static void push_to_pool(struct work_struct *work)
static size_t account(struct entropy_store *r, size_t nbytes, int min,
int reserved)
{
- int entropy_count, orig;
+ int entropy_count, orig, have_bytes;
size_t ibytes, nfrac;
BUG_ON(r->entropy_count > r->poolinfo->poolfracbits);
@@ -1277,14 +1263,12 @@ static size_t account(struct entropy_store *r, size_t nbytes, int min,
retry:
entropy_count = orig = ACCESS_ONCE(r->entropy_count);
ibytes = nbytes;
- /* If limited, never pull more than available */
- if (r->limit) {
- int have_bytes = entropy_count >> (ENTROPY_SHIFT + 3);
+ /* never pull more than available */
+ have_bytes = entropy_count >> (ENTROPY_SHIFT + 3);
- if ((have_bytes -= reserved) < 0)
- have_bytes = 0;
- ibytes = min_t(size_t, ibytes, have_bytes);
- }
+ if ((have_bytes -= reserved) < 0)
+ have_bytes = 0;
+ ibytes = min_t(size_t, ibytes, have_bytes);
if (ibytes < min)
ibytes = 0;