[PATCH v2 0/2] mtd: Harmonize implementations of OTP write and _get_{fact,user}_prot_info

[Christian Riesch]

Hi all,

In the discussion on my patchset for the OTP support for
drivers/mtd/chips/cfi_cmdset_0002.c [1-5], Artem requested two changes in the
current code of the OTP write functions and the _get_{fact,user}_prot_info
code.

These two patches are an attempt to make the requested changes.

The first patch adds a retlen parameter to the _get_fact_prot_info and
_get_user_prot_info functions and thus harmonizes the implementation
with those of the write and read functions.

The second patch fixes a problem that I earlier addressed in [1]. After
the discussion about this patch on the mtd mailing list, I think that the
correct behavior of the write function should be the one specified in [6]:
Try to write as many bytes as possible and return the number of bytes
that were written. If no data could be written due to lack of OTP memory,
return -ENOSPC.

Artem, would you please have a look at these patches? I would like to know
if I understood you correctly, or if I missed something here. Please note
that I cannot test these patches since I do not have the hardware. The
patches are compile tested only. If these patches are ok, I will also
respin the OTP support patches for cfi_cmdset_0002.

Changes for v2:
- Fixed buggy cfi_intelext_get_fact_prot_info

Thank you!

Best regards,
Christian

[1] http://patchwork.ozlabs.org/patch/239897/
[2] http://patchwork.ozlabs.org/patch/240010/
[3] http://patchwork.ozlabs.org/patch/240007/
[4] http://patchwork.ozlabs.org/patch/240008/
[5] http://patchwork.ozlabs.org/patch/240009/
[6] http://pubs.opengroup.org/onlinepubs/9699919799/functions/write.html

Cc: Artem Bityutskiy <artem.bityutskiy@xxxxxxxxxxxxxxx>
Cc: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Cc: Amul Kumar Saha <amul.saha@xxxxxxxxxxx>
Cc: Brian Norris <computersforpeace@xxxxxxxxx>

Christian Riesch (2):
  mtd: Add a retlen parameter to _get_{fact,user}_prot_info
  mtd: Fix the behavior of otp write if there is not enough room for
    data

 drivers/mtd/chips/cfi_cmdset_0001.c |   44 +++++++++++++++++++----------------
 drivers/mtd/devices/mtd_dataflash.c |   20 +++++++---------
 drivers/mtd/mtdchar.c               |   18 ++++++++++----
 drivers/mtd/mtdcore.c               |   12 +++++-----
 drivers/mtd/mtdpart.c               |   14 ++++++-----
 drivers/mtd/onenand/onenand_base.c  |   40 ++++++++++++++++---------------
 include/linux/mtd/mtd.h             |   16 ++++++-------
 7 files changed, 89 insertions(+), 75 deletions(-)

-- 
1.7.9.5

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