Am 2022-02-28 17:33, schrieb Tudor Ambarus:

Even if SPI_NOR_NO_ERASE was set, one could still send erase opcodes to the flash. It is not recommended to send unsupported opcodes to flashes. Fix the logic and do not set mtd->_erase when SPI_NOR_NO_ERASE is specified. With this users will not be able to issue erase opcodes to flashes and instead they will recive an -ENOTSUPP error.

But why is there an erase opcode and erase size set in the first place? spi_nor_select_erase() should probably return early if SPI_NOR_NO_ERASE is set. Not setting the erasesize would also return -ENOTSUPP. I prefer this one for a fixes patch, though. But spi_nor_select_erase() should also be fixed.

Reviewed-by: Michael Walle michael@walle.cc

Cc: stable@vger.kernel.org Fixes: b199489d37b2 ("mtd: spi-nor: add the framework for SPI NOR") Signed-off-by: Tudor Ambarus tudor.ambarus@microchip.com

---

drivers/mtd/spi-nor/core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c index 86a536c97c18..cd2d094ef837 100644 --- a/drivers/mtd/spi-nor/core.c +++ b/drivers/mtd/spi-nor/core.c @@ -2969,10 +2969,11 @@ static void spi_nor_set_mtd_info(struct spi_nor *nor) mtd->flags = MTD_CAP_NORFLASH; if (nor->info->flags & SPI_NOR_NO_ERASE) mtd->flags |= MTD_NO_ERASE;

• else

• mtd->_erase = spi_nor_erase;
  

  mtd->writesize = nor->params->writesize; mtd->writebufsize = nor->params->page_size; mtd->size = nor->params->size;

• mtd->_erase = spi_nor_erase; mtd->_read = spi_nor_read; /* Might be already set by some SST flashes. */ if (!mtd->_write)