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-rw-r--r--drivers/char/random.c12
1 files changed, 4 insertions, 8 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c
index 2c532a6b0a21..9675821b4b5a 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -984,14 +984,10 @@ retry:
ibytes = 0;
} else {
/* If limited, never pull more than available */
- if (r->limit && ibytes + reserved >= have_bytes)
- ibytes = have_bytes - reserved;
-
- if (have_bytes >= ibytes + reserved)
- entropy_count -= ibytes << (ENTROPY_SHIFT + 3);
- else
- entropy_count = reserved << (ENTROPY_SHIFT + 3);
-
+ if (r->limit)
+ ibytes = min_t(size_t, ibytes, have_bytes - reserved);
+ entropy_count = max_t(int, 0,
+ entropy_count - (ibytes << (ENTROPY_SHIFT + 3)));
if (cmpxchg(&r->entropy_count, orig, entropy_count) != orig)
goto retry;