This v3 changes the approach for the deadlock fix with wrappers which
provide the same solution of the try_module_get(). This is less code,
should be easier to review.

The last patch is also new. I dropped the bdget() stuff for the block
device and instead am doing a direct kobject fetch as well as a bus get to
provide a more generic solution without having to require each type to
implement its own refcounts.

This series also available on my linux-next repository:

https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git/log/?h=20210427-sysfs-fix-races-v5

Luis Chamberlain (3):
  zram: fix crashes due to use of cpu hotplug multistate
  zram: fix deadlock with sysfs attribute usage and driver removal
  drivers/base/core: refcount kobject and bus on device attribute read /
    store

 drivers/base/base.h           |   2 +
 drivers/base/bus.c            |   4 +-
 drivers/base/core.c           |  42 +++++++++-
 drivers/block/zram/zram_drv.c | 141 ++++++++++++++++++++++++----------
 drivers/block/zram/zram_drv.h |  40 ++++++++++
 5 files changed, 181 insertions(+), 48 deletions(-)

-- 
2.30.2