diff options
Diffstat (limited to 'drivers/char/random.c')
| -rw-r--r-- | drivers/char/random.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c index 6b75713d953..06cea7ff3a7 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -902,6 +902,7 @@ void add_disk_randomness(struct gendisk *disk) add_timer_randomness(disk->random, 0x100 + disk_devt(disk)); trace_add_disk_randomness(disk_devt(disk), ENTROPY_BITS(&input_pool)); } +EXPORT_SYMBOL_GPL(add_disk_randomness); #endif /********************************************************************* @@ -995,8 +996,11 @@ retry: ibytes = min_t(size_t, ibytes, have_bytes - reserved); if (ibytes < min) ibytes = 0; - entropy_count = max_t(int, 0, - entropy_count - (ibytes << (ENTROPY_SHIFT + 3))); + if (have_bytes >= ibytes + reserved) + entropy_count -= ibytes << (ENTROPY_SHIFT + 3); + else + entropy_count = reserved << (ENTROPY_SHIFT + 3); + if (cmpxchg(&r->entropy_count, orig, entropy_count) != orig) goto retry; |