linux-kernel - [PATCH RESEND v5 13/13] spi: airoha: buffer must be 0xff-ed before writing

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Message-ID: <20250917215849.19720-14-mikhail.kshevetskiy@iopsys.eu>
Date: Thu, 18 Sep 2025 00:58:49 +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>,
	Andy Shevchenko <andy@...nel.org>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-spi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Mikhail Kshevetskiy <mikhail.kshevetskiy@...sys.eu>,
	Andreas Gnau <andreas.gnau@...sys.eu>
Subject: [PATCH RESEND v5 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 437ab6745b1a..57b1950e853f 100644
--- a/drivers/spi/spi-airoha-snfi.c
+++ b/drivers/spi/spi-airoha-snfi.c
@@ -776,6 +776,7 @@ 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);
-- 
2.51.0