4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Greg Kroah-Hartman gregkh@linuxfoundation.org
This reverts commit 5d3cf50105d007adc54949e0caeca1e944549723 which is commit 628bd85947091830a8c4872adfd5ed1d515a9cf2 upstream.
It does not work properly in the 4.9.y tree and causes more problems than it fixes, so revert it.
Reported-by: Thomas Lindroth thomas.lindroth@gmail.com Reported-by: Jan Kara jack@suse.cz Cc: syzbot syzbot+c0138741c2290fc5e63f@syzkaller.appspotmail.com Cc: Ming Lei ming.lei@redhat.com Cc: Tetsuo Handa penguin-kernel@I-love.SAKURA.ne.jp Cc: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/block/loop.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -1929,10 +1929,12 @@ static long loop_control_ioctl(struct fi break; if (lo->lo_state != Lo_unbound) { ret = -EBUSY; + mutex_unlock(&loop_ctl_mutex); break; } if (atomic_read(&lo->lo_refcnt) > 0) { ret = -EBUSY; + mutex_unlock(&loop_ctl_mutex); break; } lo->lo_disk->private_data = NULL;