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random: only update the last_pulled time if we actually transferred entropy

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In xfer_secondary_pull(), check to make sure we need to pull from the
secondary pool before checking and potentially updating the
last_pulled time.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: George Spelvin <linux@horizon.com>
This commit is contained in:
Theodore Ts'o 2014-06-10 23:18:16 -04:00
parent 85608f8e16
commit cff850312c
1 changed files with 7 additions and 4 deletions
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9
drivers/char/random.c
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@ -920,6 +920,11 @@ static ssize_t extract_entropy(struct entropy_store *r, void *buf,
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;
if (r->limit == 0 && random_min_urandom_seed) {
unsigned long now = jiffies;
@ -928,9 +933,7 @@ static void xfer_secondary_pool(struct entropy_store *r, size_t nbytes)
return;
r->last_pulled = now;
}
if (r->pull &&
r->entropy_count < (nbytes << (ENTROPY_SHIFT + 3)) &&
r->entropy_count < r->poolinfo->poolfracbits)
_xfer_secondary_pool(r, nbytes);
}