linux-kernel - [PATCH v3 10/14] spi: airoha: buffer must be 0xff-ed before writing

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Message-ID: <20250820123317.728148-11-mikhail.kshevetskiy@iopsys.eu>
Date: Wed, 20 Aug 2025 15:33:13 +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>,
	linux-arm-kernel@...ts.infradead.org,
	linux-spi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Frieder Schrempf <frieder.schrempf@...tron.de>
Cc: Mikhail Kshevetskiy <mikhail.kshevetskiy@...sys.eu>
Subject: [PATCH v3 10/14] 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 | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/spi/spi-airoha-snfi.c b/drivers/spi/spi-airoha-snfi.c
index c3348ef4fc08..57eee658fb30 100644
--- a/drivers/spi/spi-airoha-snfi.c
+++ b/drivers/spi/spi-airoha-snfi.c
@@ -848,6 +848,9 @@ static ssize_t airoha_snand_dirmap_write(struct spi_mem_dirmap_desc *desc,
 		return -EOPNOTSUPP;
 	}
 
+	memset(txrx_buf, 0xff,
+	       (as_ctrl->nfi_cfg.sec_size + as_ctrl->nfi_cfg.spare_size) *
+	       as_ctrl->nfi_cfg.sec_num);
 	memcpy(txrx_buf + offs, buf, len);
 
 	err = airoha_snand_set_mode(as_ctrl, SPI_MODE_DMA);
-- 
2.50.1