linux-kernel - [PATCH v4 0/4] mtd: core: protect access to mtd devices while in suspend

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Date:   Tue, 26 Oct 2021 07:55:47 +0200
From:   Sean Nyekjaer <sean@...nix.com>
To:     Boris Brezillon <boris.brezillon@...labora.com>
Cc:     Sean Nyekjaer <sean@...nix.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 0/4] mtd: core: protect access to mtd devices while in suspend

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

Changes since v3:
 - edited commit msg and author for mtdconcat patch

Changes since v2:
 - added signoff's to patch from Boris
 - removed accidential line break
 - kept tests consistent: master->master.suspended == 0 -> !master->master.suspended
 - added comments to mtdconcat patch
 - moved mtdconcat before ('mtd: core: protect access to MTD devices while in suspend')

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.

Boris Brezillon (2):
  mtd: rawnand: nand_bbt: hide suspend/resume hooks while scanning bbt
  mtd: mtdconcat: don't use mtd_{suspend,resume}()

Sean Nyekjaer (2):
  mtd: core: protect access to MTD devices while in suspend
  mtd: rawnand: remove suspended check

 drivers/mtd/mtdconcat.c          |  15 +++-
 drivers/mtd/mtdcore.c            | 124 +++++++++++++++++++++++++++----
 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, 230 insertions(+), 75 deletions(-)

-- 
2.33.0