linux-kernel - [PATCH 4/4] drivers: spi: spi-airoha-snfi: return an error for continuous mode dirmap creation cases

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Message-ID: <20250804192132.1406387-5-mikhail.kshevetskiy@iopsys.eu>
Date: Mon,  4 Aug 2025 22:21:32 +0300
From: Mikhail Kshevetskiy <mikhail.kshevetskiy@...sys.eu>
To: Miquel Raynal <miquel.raynal@...tlin.com>,
	Richard Weinberger <richard@....at>,
	Vignesh Raghavendra <vigneshr@...com>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Ray Liu <ray.liu@...oha.com>,
	Mark Brown <broonie@...nel.org>,
	Tudor Ambarus <tudor.ambarus@...aro.org>,
	Martin Kurbanov <mmkurbanov@...utedevices.com>,
	Takahiro Kuwano <Takahiro.Kuwano@...ineon.com>,
	Cheng Ming Lin <chengminglin@...c.com.tw>,
	linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-spi@...r.kernel.org
Cc: Mikhail Kshevetskiy <mikhail.kshevetskiy@...sys.eu>
Subject: [PATCH 4/4] drivers: spi: spi-airoha-snfi: return an error for continuous mode dirmap creation cases

This driver can accelerate single page operations only, thus
continuous reading mode should not be used.

Continuous reading will use sizes up to the size of one erase block.
This size is much larger than the size of single flash page. Use this
difference to identify continuous reading and return an error.

Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy@...sys.eu>
---
 drivers/spi/spi-airoha-snfi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/spi/spi-airoha-snfi.c b/drivers/spi/spi-airoha-snfi.c
index dbe640986825..043a03cd90a1 100644
--- a/drivers/spi/spi-airoha-snfi.c
+++ b/drivers/spi/spi-airoha-snfi.c
@@ -618,6 +618,10 @@ static int airoha_snand_dirmap_create(struct spi_mem_dirmap_desc *desc)
 	if (desc->info.offset + desc->info.length > U32_MAX)
 		return -EINVAL;
 
+	/* continuous reading is not supported */
+	if (desc->info.length > SPI_NAND_CACHE_SIZE)
+		return -E2BIG;
+
 	if (!airoha_snand_supports_op(desc->mem, &desc->info.op_tmpl))
 		return -EOPNOTSUPP;
 
-- 
2.47.2