6.9-stable review patch. If anyone has any objections, please let me know.
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From: Miquel Raynal miquel.raynal@bootlin.com
commit 8754d9835683e8fab9a8305acdb38a3aeb9d20bd upstream.
Early during NAND identification, mtd_info fields have not yet been initialized (namely, writesize and oobsize) and thus cannot be used for sanity checks yet. Of course if there is a misuse of nand_change_read_column_op() so early we won't be warned, but there is anyway no actual check to perform at this stage as we do not yet know the NAND geometry.
So, if the fields are empty, especially mtd->writesize which is *always* set quite rapidly after identification, let's skip the sanity checks.
nand_change_read_column_op() is subject to be used early for ONFI/JEDEC identification in the very unlikely case of: - bitflips appearing in the parameter page, - the controller driver not supporting simple DATA_IN cycles.
As nand_change_read_column_op() uses nand_fill_column_cycles() the logic explaind above also applies in this secondary helper.
Fixes: c27842e7e11f ("mtd: rawnand: onfi: Adapt the parameter page read to constraint controllers") Fixes: daca31765e8b ("mtd: rawnand: jedec: Adapt the parameter page read to constraint controllers") Cc: stable@vger.kernel.org Reported-by: Alexander Dahl ada@thorsis.com Closes: https://lore.kernel.org/linux-mtd/20240306-shaky-bunion-d28b65ea97d7@thorsis... Reported-by: Steven Seeger steven.seeger@flightsystems.net Closes: https://lore.kernel.org/linux-mtd/DM6PR05MB4506554457CF95191A670BDEF7062@DM6... Signed-off-by: Miquel Raynal miquel.raynal@bootlin.com Tested-by: Sascha Hauer s.hauer@pengutronix.de Link: https://lore.kernel.org/linux-mtd/20240516131320.579822-3-miquel.raynal@boot... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/mtd/nand/raw/nand_base.c | 57 +++++++++++++++++++++------------------ 1 file changed, 32 insertions(+), 25 deletions(-)
--- a/drivers/mtd/nand/raw/nand_base.c +++ b/drivers/mtd/nand/raw/nand_base.c @@ -1093,28 +1093,32 @@ static int nand_fill_column_cycles(struc unsigned int offset_in_page) { struct mtd_info *mtd = nand_to_mtd(chip); + bool ident_stage = !mtd->writesize;
- /* Make sure the offset is less than the actual page size. */ - if (offset_in_page > mtd->writesize + mtd->oobsize) - return -EINVAL; - - /* - * On small page NANDs, there's a dedicated command to access the OOB - * area, and the column address is relative to the start of the OOB - * area, not the start of the page. Asjust the address accordingly. - */ - if (mtd->writesize <= 512 && offset_in_page >= mtd->writesize) - offset_in_page -= mtd->writesize; - - /* - * The offset in page is expressed in bytes, if the NAND bus is 16-bit - * wide, then it must be divided by 2. - */ - if (chip->options & NAND_BUSWIDTH_16) { - if (WARN_ON(offset_in_page % 2)) + /* Bypass all checks during NAND identification */ + if (likely(!ident_stage)) { + /* Make sure the offset is less than the actual page size. */ + if (offset_in_page > mtd->writesize + mtd->oobsize) return -EINVAL;
- offset_in_page /= 2; + /* + * On small page NANDs, there's a dedicated command to access the OOB + * area, and the column address is relative to the start of the OOB + * area, not the start of the page. Asjust the address accordingly. + */ + if (mtd->writesize <= 512 && offset_in_page >= mtd->writesize) + offset_in_page -= mtd->writesize; + + /* + * The offset in page is expressed in bytes, if the NAND bus is 16-bit + * wide, then it must be divided by 2. + */ + if (chip->options & NAND_BUSWIDTH_16) { + if (WARN_ON(offset_in_page % 2)) + return -EINVAL; + + offset_in_page /= 2; + } }
addrs[0] = offset_in_page; @@ -1123,7 +1127,7 @@ static int nand_fill_column_cycles(struc * Small page NANDs use 1 cycle for the columns, while large page NANDs * need 2 */ - if (mtd->writesize <= 512) + if (!ident_stage && mtd->writesize <= 512) return 1;
addrs[1] = offset_in_page >> 8; @@ -1436,16 +1440,19 @@ int nand_change_read_column_op(struct na unsigned int len, bool force_8bit) { struct mtd_info *mtd = nand_to_mtd(chip); + bool ident_stage = !mtd->writesize;
if (len && !buf) return -EINVAL;
- if (offset_in_page + len > mtd->writesize + mtd->oobsize) - return -EINVAL; + if (!ident_stage) { + if (offset_in_page + len > mtd->writesize + mtd->oobsize) + return -EINVAL;
- /* Small page NANDs do not support column change. */ - if (mtd->writesize <= 512) - return -ENOTSUPP; + /* Small page NANDs do not support column change. */ + if (mtd->writesize <= 512) + return -ENOTSUPP; + }
if (nand_has_exec_op(chip)) { const struct nand_interface_config *conf =