diff options
| -rw-r--r-- | drivers/char/random.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c index 1838aa3d24f..7ce1ac4baa6 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -407,7 +407,7 @@ struct entropy_store { /* read-write data: */ spinlock_t lock; unsigned add_ptr; - int entropy_count; + int entropy_count; /* Must at no time exceed ->POOLBITS! */ int input_rotate; }; @@ -520,6 +520,7 @@ static void mix_pool_bytes(struct entropy_store *r, const void *in, int bytes) static void credit_entropy_bits(struct entropy_store *r, int nbits) { unsigned long flags; + int entropy_count; if (!nbits) return; @@ -527,20 +528,20 @@ static void credit_entropy_bits(struct entropy_store *r, int nbits) spin_lock_irqsave(&r->lock, flags); DEBUG_ENT("added %d entropy credits to %s\n", nbits, r->name); - r->entropy_count += nbits; - if (r->entropy_count < 0) { + entropy_count = r->entropy_count; + entropy_count += nbits; + if (entropy_count < 0) { DEBUG_ENT("negative entropy/overflow\n"); - r->entropy_count = 0; - } else if (r->entropy_count > r->poolinfo->POOLBITS) - r->entropy_count = r->poolinfo->POOLBITS; + entropy_count = 0; + } else if (entropy_count > r->poolinfo->POOLBITS) + entropy_count = r->poolinfo->POOLBITS; + r->entropy_count = entropy_count; /* should we wake readers? */ - if (r == &input_pool && - r->entropy_count >= random_read_wakeup_thresh) { + if (r == &input_pool && entropy_count >= random_read_wakeup_thresh) { wake_up_interruptible(&random_read_wait); kill_fasync(&fasync, SIGIO, POLL_IN); } - spin_unlock_irqrestore(&r->lock, flags); } |