mtd: always initialize 'stats' in struct mtd_oob_ops

As the 'stats' field in struct mtd_oob_ops is used in conditional
expressions, ensure it is always zero-initialized in all such structures
to prevent random stack garbage from being interpreted as a pointer.

Strictly speaking, this problem currently only needs to be fixed for
struct mtd_oob_ops structures subsequently passed to mtd_read_oob().
However, this commit goes a step further and makes all instances of
struct mtd_oob_ops in the tree zero-initialized, in hope of preventing
future problems, e.g. if struct mtd_req_stats gets extended with write
statistics at some point.

Signed-off-by: Michał Kępień <kernel@kempniu.pl>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220629125737.14418-3-kernel@kempniu.pl

mtd: onenand: remove redundant variable ooblen

Variable ooblen is being initialized with a value that is never read.
The variable is never used after this, so it is redundant and can be
removed.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20211205230729.79337-1-colin.i.king@gmail.com

mtd: onenand: onenand_bbt: Fix expected kernel-doc formatting

Fixes the following W=1 kernel build warning(s):

drivers/mtd/nand/onenand/onenand_bbt.c:33: warning: Function parameter or member 'buf' not described in 'check_short_pattern'
drivers/mtd/nand/onenand/onenand_bbt.c:33: warning: Function parameter or member 'len' not described in 'check_short_pattern'
drivers/mtd/nand/onenand/onenand_bbt.c:33: warning: Function parameter or member 'paglen' not described in 'check_short_pattern'
drivers/mtd/nand/onenand/onenand_bbt.c:33: warning: Function parameter or member 'td' not described in 'check_short_pattern'
drivers/mtd/nand/onenand/onenand_bbt.c:57: warning: Function parameter or member 'mtd' not described in 'create_bbt'
drivers/mtd/nand/onenand/onenand_bbt.c:57: warning: Function parameter or member 'buf' not described in 'create_bbt'
drivers/mtd/nand/onenand/onenand_bbt.c:57: warning: Function parameter or member 'bd' not described in 'create_bbt'
drivers/mtd/nand/onenand/onenand_bbt.c:57: warning: Function parameter or member 'chip' not described in 'create_bbt'
drivers/mtd/nand/onenand/onenand_bbt.c:132: warning: Function parameter or member 'mtd' not described in 'onenand_memory_bbt'
drivers/mtd/nand/onenand/onenand_bbt.c:132: warning: Function parameter or member 'bd' not described in 'onenand_memory_bbt'
drivers/mtd/nand/onenand/onenand_bbt.c:145: warning: Function parameter or member 'mtd' not described in 'onenand_isbad_bbt'
drivers/mtd/nand/onenand/onenand_bbt.c:145: warning: Function parameter or member 'offs' not described in 'onenand_isbad_bbt'
drivers/mtd/nand/onenand/onenand_bbt.c:145: warning: Function parameter or member 'allowbbt' not described in 'onenand_isbad_bbt'
drivers/mtd/nand/onenand/onenand_bbt.c:182: warning: Function parameter or member 'mtd' not described in 'onenand_scan_bbt'
drivers/mtd/nand/onenand/onenand_bbt.c:182: warning: Function parameter or member 'bd' not described in 'onenand_scan_bbt'
drivers/mtd/nand/onenand/onenand_bbt.c:230: warning: Function parameter or member 'mtd' not described in 'onenand_default_bbt'

Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Vignesh Raghavendra <vigneshr@ti.com>
Cc: linux-mtd@lists.infradead.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20201109182206.3037326-7-lee.jones@linaro.org

mtd: onenand: Store bad block marker position in chip struct

The information about where the manufacturer puts the bad block
markers inside the bad block and in the OOB data is stored in
different places. Let's move this information to the chip struct,
as we did it for rawnand.

Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

mtd: Move onenand code base to drivers/mtd/nand/onenand

Move onenand code base to the drivers/mtd/nand directory in the hope
that someday someone will patch it to use the generic NAND helpers.
If it never happens, at least we'll have all NAND related support in a
single directory and not spread over the drivers/mtd/ directory.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>