From 2996c2a7a8ea54b942a3bac2fadc0e6120e2d37f Mon Sep 17 00:00:00 2001 From: Mikhail Kshevetskiy Date: Sun, 9 Nov 2025 10:06:52 +0300 Subject: [PATCH] spi: airoha: buffer must be 0xff-ed before writing 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 --- 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) -- 2.47.3