[PATCH] spi: spi-qpic-snand: reject when no enough OOB space

Print a clear error when the flash doesn't have enough space, instand of
return -EBADMSG silently in read or write functions.

ECC4 requires 64B OOB space.
ECC8 requires 80B OOB space.

Signed-off-by: Ziyang Huang <[email protected]>
---
 drivers/spi/spi-qpic-snand.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-qpic-snand.c b/drivers/spi/spi-qpic-snand.c
index b6c58d9cfe14..3d0013e5687f 100644
--- a/drivers/spi/spi-qpic-snand.c
+++ b/drivers/spi/spi-qpic-snand.c
@@ -323,6 +323,15 @@ static int qcom_spi_ecc_init_ctx_pipelined(struct nand_device *nand)
 	ecc_cfg->cw_size = ecc_cfg->cw_data + ecc_cfg->bytes;
 	bad_block_byte = mtd->writesize - ecc_cfg->cw_size * (cwperpage - 1) + 1;
 
+	if ((ecc_cfg->cw_size * cwperpage) > (mtd->writesize + mtd->oobsize)) {
+		dev_err(snandc->dev,
+			"Current ECC settings require %d bytes, but the flash only has %d+%d bytes.\n",
+			(ecc_cfg->cw_size * cwperpage), mtd->writesize,
+			mtd->oobsize);
+		ret = -EINVAL;
+		goto err_free_ecc_cfg;
+	}
+
 	mtd_set_ooblayout(mtd, &qcom_spi_ooblayout);
 
 	/*
@@ -1659,4 +1668,3 @@ module_platform_driver(qcom_spi_driver);
 MODULE_DESCRIPTION("SPI driver for QPIC QSPI cores");
 MODULE_AUTHOR("Md Sadre Alam <[email protected]>");
 MODULE_LICENSE("GPL");
-
-- 
2.40.1