From cda796a3d572059d64f5429dfc1d00ca6fcbaf8d Mon Sep 17 00:00:00 2001
From: Matt Mackall <mpm@selenic.com>
Date: Tue, 6 Jan 2009 14:42:55 -0800
Subject: [PATCH] random: don't try to look at entropy_count outside the lock

As a non-atomic value, it's only safe to look at entropy_count when the
pool lock is held, so we move the BUG_ON inside the lock for correctness.

Also remove the spurious comment.  It's ok for entropy_count to
temporarily exceed POOLBITS so long as it's left in a consistent state
when the lock is released.

This is a more correct, simple, and idiomatic fix for the bug in
8b76f46a2db.  I've left the reorderings introduced by that patch in place
as they're harmless, even though they don't properly deal with potential
atomicity issues.

Signed-off-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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