[PATCH 0/3] mtd: rawnand: sunxi: harden protected OOB handling

The H6/H616 variable protected-OOB implementation has three related
failure cases around its per-step user-data lengths.

First, propagate failures while allocating the per-step length array.
Then reserve an encodable four-byte first section for the bad block
marker and reject layouts which cannot provide it. Finally, replace the
per-write heap allocation used for BBM compensation with the
controller's bounded 32-byte stack buffer.

These fixes keep the calculated, advertised and programmed OOB layouts
consistent and prevent zero-sized sections from reaching the BBM path.

Assisted-by: OpenAI Codex (gpt-5.6-sol, max)
Signed-off-by: James Hilliard <[email protected]>
---
James Hilliard (3):
      mtd: rawnand: sunxi: propagate user-data allocation errors
      mtd: rawnand: sunxi: reserve a full user-data word for BBM
      mtd: rawnand: sunxi: use a stack buffer for BBM randomization

 drivers/mtd/nand/raw/sunxi_nand.c | 32 +++++++++++++++++++++-----------
 1 file changed, 21 insertions(+), 11 deletions(-)
---
base-commit: 15a3cbce32994141252bb4ecfe3ff3a5d22d0b4f
change-id: 20260810-sunxi-nand-protected-oob-fixes-15db4368a8ae

Best regards,
--  
James Hilliard <[email protected]>