[PATCH v2 0/4] dax/bus.c: Fixups for dax-bus locking

[Vishal Verma]

Commit Fixes: c05ae9d85b47 ("dax/bus.c: replace driver-core lock usage by a local rwsem")
introduced a few problems that this series aims to fix. Add back
device_lock() where it was correctly used (during device manipulation
operations), remove conditional locking in unregister_dax_dev() and
unregister_dax_mapping(), use non-interruptible versions of rwsem
locks when not called from a user process, and fix up a write vs.
read usage of an rwsem.

Signed-off-by: Vishal Verma <vishal.l.verma@xxxxxxxxx>
---
Changes in v2:
- Add back valid device_lock uses (Dan)
- Remove conditional locking (Dan)
- Use non-interruptible versions of rwsem locks when not called from a
  user process (Dan)
- Fix up a write vs. read usage of an rwsem
- Link to v1: https://lore.kernel.org/r/20240402-vv-dax_abi_fixes-v1-1-c3e0fdbafba5@xxxxxxxxx

---
Vishal Verma (4):
      dax/bus.c: replace WARN_ON_ONCE() with lockdep asserts
      dax/bus.c: fix locking for unregister_dax_dev / unregister_dax_mapping paths
      dax/bus.c: Don't use down_write_killable for non-user processes
      dax/bus.c: Use the right locking mode (read vs write) in size_show

 drivers/dax/bus.c | 68 ++++++++++++++++---------------------------------------
 1 file changed, 20 insertions(+), 48 deletions(-)
---
base-commit: 39cd87c4eb2b893354f3b850f916353f2658ae6f
change-id: 20240402-vv-dax_abi_fixes-8af3b6ff2e5a

Best regards,
-- 
Vishal Verma <vishal.l.verma@xxxxxxxxx>