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    Subject[PATCH 4.4 067/342] bcache: allows use of register in udev to avoid "device_busy" error.
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Gabriel de Perthuis <g2p.code@gmail.com>

    commit d7076f21629f8f329bca4a44dc408d94670f49e2 upstream.

    Allows to use register, not register_quiet in udev to avoid "device_busy" error.
    The initial patch proposed at https://lkml.org/lkml/2013/8/26/549 by Gabriel de Perthuis
    <g2p.code@gmail.com> does not unlock the mutex and hangs the kernel.

    See http://thread.gmane.org/gmane.linux.kernel.bcache.devel/2594 for the discussion.

    Cc: Denis Bychkov <manover@gmail.com>
    Cc: Kent Overstreet <kent.overstreet@gmail.com>
    Cc: Eric Wheeler <bcache@linux.ewheeler.net>
    Cc: Gabriel de Perthuis <g2p.code@gmail.com>
    Signed-off-by: Jens Axboe <axboe@fb.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/md/bcache/super.c | 5 +++--
    1 file changed, 3 insertions(+), 2 deletions(-)

    --- a/drivers/md/bcache/super.c
    +++ b/drivers/md/bcache/super.c
    @@ -1938,6 +1938,8 @@ static ssize_t register_bcache(struct ko
    else
    err = "device busy";
    mutex_unlock(&bch_register_lock);
    + if (attr == &ksysfs_register_quiet)
    + goto out;
    }
    goto err;
    }
    @@ -1976,8 +1978,7 @@ out:
    err_close:
    blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
    err:
    - if (attr != &ksysfs_register_quiet)
    - pr_info("error opening %s: %s", path, err);
    + pr_info("error opening %s: %s", path, err);
    ret = -EINVAL;
    goto out;
    }
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