From a58aa4edc6d2e779894b1fa95a2f4de157ff3b3b Mon Sep 17 00:00:00 2001 From: Greg Price Date: Fri, 29 Nov 2013 20:09:37 -0500 Subject: [PATCH] random: forget lock in lockless accounting The only mutable data accessed here is ->entropy_count, but since 10b3a32d2 ("random: fix accounting race condition") we use cmpxchg to protect our accesses to ->entropy_count here. Drop the use of the lock. Cc: Jiri Kosina Signed-off-by: Greg Price Signed-off-by: "Theodore Ts'o" --- drivers/char/random.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/drivers/char/random.c b/drivers/char/random.c index 9675821b4b5a..694510af4fcd 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -970,9 +970,6 @@ static size_t account(struct entropy_store *r, size_t nbytes, int min, int entropy_count, orig; size_t ibytes; - /* Hold lock while accounting */ - spin_lock_irqsave(&r->lock, flags); - BUG_ON(r->entropy_count > r->poolinfo->poolfracbits); /* Can we pull enough? */ @@ -995,7 +992,6 @@ retry: < random_write_wakeup_thresh) wakeup_write = 1; } - spin_unlock_irqrestore(&r->lock, flags); trace_debit_entropy(r->name, 8 * ibytes); if (wakeup_write) { -- 2.39.5