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Date: Tue, 10 Jun 2014 23:30:20 -0400 From: Theodore Ts'o <tytso@....edu> To: linux-kernel@...r.kernel.org Cc: Theodore Ts'o <tytso@....edu>, George Spelvin <linux@...izon.com> Subject: [PATCH 3/3] random: only update the last_pulled time if we actually transferred entropy 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@....edu> Cc: George Spelvin <linux@...izon.com> --- drivers/char/random.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/drivers/char/random.c b/drivers/char/random.c index 97f390b..4bb6e37 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -919,6 +919,11 @@ 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; @@ -927,10 +932,8 @@ 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); + + _xfer_secondary_pool(r, nbytes); } static void _xfer_secondary_pool(struct entropy_store *r, size_t nbytes) -- 2.0.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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