During writing, the entire flash page (including OOB) will be updated with the values from the temporary buffer, so we need to fill the untouched areas of the buffer with 0xff value to prevent accidental data overwriting.
Signed-off-by: Mikhail Kshevetskiy <[email protected]> --- drivers/spi/airoha_snfi_spi.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/spi/airoha_snfi_spi.c b/drivers/spi/airoha_snfi_spi.c index 65381060407..23c4507b10d 100644 --- a/drivers/spi/airoha_snfi_spi.c +++ b/drivers/spi/airoha_snfi_spi.c @@ -819,7 +819,11 @@ static ssize_t airoha_snand_dirmap_write(struct spi_mem_dirmap_desc *desc, return -EOPNOTSUPP; } + if (offs > 0) + memset(txrx_buf, 0xff, offs); memcpy(txrx_buf + offs, buf, len); + if (bytes > offs + len) + memset(txrx_buf + offs + len, 0xff, bytes - offs - len); err = airoha_snand_set_mode(priv, SPI_MODE_DMA); if (err < 0) -- 2.51.0
