linux-kernel - [PATCH v4 13/13] spi: airoha: buffer must be 0xff-ed before writing

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Message-ID: <20250823001626.3641935-14-mikhail.kshevetskiy@iopsys.eu>
Date: Sat, 23 Aug 2025 03:16:25 +0300
From: Mikhail Kshevetskiy <mikhail.kshevetskiy@...sys.eu>
To: Lorenzo Bianconi <lorenzo@...nel.org>,
	Ray Liu <ray.liu@...oha.com>,
	Mark Brown <broonie@...nel.org>,
	Jyothi Kumar Seerapu <quic_jseerapu@...cinc.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-spi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Mikhail Kshevetskiy <mikhail.kshevetskiy@...sys.eu>
Subject: [PATCH v4 13/13] 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 <mikhail.kshevetskiy@...sys.eu>
---
 drivers/spi/spi-airoha-snfi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/spi/spi-airoha-snfi.c b/drivers/spi/spi-airoha-snfi.c
index 2388392ab5ea..096c99347983 100644
--- a/drivers/spi/spi-airoha-snfi.c
+++ b/drivers/spi/spi-airoha-snfi.c
@@ -775,6 +775,7 @@ static ssize_t airoha_snand_dirmap_write(struct spi_mem_dirmap_desc *desc,
 		return -EOPNOTSUPP;
 	}
 
+	memset(txrx_buf, 0xff, bytes);
 	memcpy(txrx_buf + offs, buf, len);
 
 	err = airoha_snand_set_mode(as_ctrl, SPI_MODE_DMA);
-- 
2.50.1