commit aa2c96d6f329e66cc59352b0f12e8f04e6a9593b
author Josh Hunt <johunt@akamai.com> Mon Jun 27 16:18:08 2011 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> Mon Jun 27 18:00:13 2011 -0700
tree 0d7db978da167df605b14d4880969b39caf5e0f4
parent 507c5f1224014f9956e604ee8703b3bbea7da4a4

drivers/misc/lkdtm.c: fix race when crashpoint is hit multiple times before checking count

We observed the crash point count going negative in cases where the
crash point is hit multiple times before the check of "count == 0" is
done.  Because of this we never call lkdtm_do_action().  This patch just
adds a spinlock to protect count.

Reported-by: Tapan Dhimant <tdhimant@akamai.com>
Signed-off-by: Josh Hunt <johunt@akamai.com>
Acked-by: Ankita Garg <ankita@in.ibm.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>