[PATCH v2 0/4] mtd: core: protect access to mtd devices while in suspend

[Sean Nyekjaer]

Follow-up on discussion in:
https://lkml.org/lkml/2021/10/4/41
https://lkml.org/lkml/2021/10/11/435

Changes since v1:
 - removed __mtd_suspend/__mtd_resume functions as they are not used by
   mtdconcat anymore.
 - only master mtd_info is used for mtd_{start,end}_access(). Warn if we
   got mtd's.
 - added Boris patch for using uninitialized _suspend/_resume hooks when
   bbt scanning
 - mtdconcat uses device _suspend/_resume hooks
 - I don't really like the macro proposal from Boris
   mtd_no_suspend_void_call()/mtd_no_suspend_ret_call() I think they
   make the code complex to read and the macro's doesn't fit every
   where anyway...

Changes since from rfc v1/v2:
 - added access protection for all device access hooks in mtd_info.
 - added Suggested-by to [1/3] patch.
 - removed refereces to commit ef347c0cfd61 ("mtd: rawnand: gpmi: Implement exec_op")
   from commit msg as commit 013e6292aaf5 ("mtd: rawnand: Simplify the locking") is 
   to be blamed.
 - tested on a kernel with LOCKDEP enabled.

Sean Nyekjaer (4):
  mtd: rawnand: nand_bbt: hide suspend/resume hooks while scanning bbt
  mtd: core: protect access to MTD devices while in suspend
  mtd: rawnand: remove suspended check
  mtd: mtdconcat: add suspend lock handling

 drivers/mtd/mtdconcat.c          |   7 +-
 drivers/mtd/mtdcore.c            | 131 +++++++++++++++++++++++++++----
 drivers/mtd/nand/raw/nand_base.c |  52 +++---------
 drivers/mtd/nand/raw/nand_bbt.c  |  28 ++++++-
 include/linux/mtd/mtd.h          |  81 +++++++++++++++----
 include/linux/mtd/rawnand.h      |   5 +-
 6 files changed, 227 insertions(+), 77 deletions(-)

-- 
2.33.0