mm/z3fold.c: fix race between migration and destruction
authorHenry Burns <henryburns@google.com>
Sun, 25 Aug 2019 00:54:37 +0000 (17:54 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sun, 25 Aug 2019 02:48:42 +0000 (19:48 -0700)
commitd776aaa9895eb6eb770908e899cb7f5bd5025b3c
treef1a7e0d904768ba84f4532ecc905ec400289a9d1
parent361469211f876e67d7ca3d3d29e6d1c3e313d0f1
mm/z3fold.c: fix race between migration and destruction

In z3fold_destroy_pool() we call destroy_workqueue(&pool->compact_wq).
However, we have no guarantee that migration isn't happening in the
background at that time.

Migration directly calls queue_work_on(pool->compact_wq), if destruction
wins that race we are using a destroyed workqueue.

Link: http://lkml.kernel.org/r/20190809213828.202833-1-henryburns@google.com
Signed-off-by: Henry Burns <henryburns@google.com>
Cc: Vitaly Wool <vitalywool@gmail.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Jonathan Adams <jwadams@google.com>
Cc: Henry Burns <henrywolfeburns@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/z3fold.c