linux-kernel - [PATCH 5.15 258/667] mtd: spi-nor: core: Check written SR value in spi_nor_write_16bit_sr_and

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Message-Id: <20220607164942.520598329@linuxfoundation.org>
Date:   Tue,  7 Jun 2022 18:58:43 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chen-Tsung Hsieh <chentsung@...omium.org>,
        Pratyush Yadav <p.yadav@...com>,
        Michael Walle <michael@...le.cc>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 258/667] mtd: spi-nor: core: Check written SR value in spi_nor_write_16bit_sr_and_check()

From: Chen-Tsung Hsieh <chentsung@...omium.org>

[ Upstream commit 70dd83d737d8900b2d98db6dc6b928c596334d37 ]

Read back Status Register 1 to ensure that the written byte match the
received value and return -EIO if read back test failed.

Without this patch, spi_nor_write_16bit_sr_and_check() only check the
second half of the 16bit. It causes errors like spi_nor_sr_unlock()
return success incorrectly when spi_nor_write_16bit_sr_and_check()
doesn't write SR successfully.

Fixes: 39d1e3340c73 ("mtd: spi-nor: Fix clearing of QE bit on lock()/unlock()")
Signed-off-by: Chen-Tsung Hsieh <chentsung@...omium.org>
Signed-off-by: Pratyush Yadav <p.yadav@...com>
Reviewed-by: Michael Walle <michael@...le.cc>
Reviewed-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
Acked-by: Pratyush Yadav <p.yadav@...com>
Link: https://lore.kernel.org/r/20220126073227.3401275-1-chentsung@chromium.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/mtd/spi-nor/core.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index cc08bd707378..90f39aabc1ff 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -1007,6 +1007,15 @@ static int spi_nor_write_16bit_sr_and_check(struct spi_nor *nor, u8 sr1)
 	if (ret)
 		return ret;
 
+	ret = spi_nor_read_sr(nor, sr_cr);
+	if (ret)
+		return ret;
+
+	if (sr1 != sr_cr[0]) {
+		dev_dbg(nor->dev, "SR: Read back test failed\n");
+		return -EIO;
+	}
+
 	if (nor->flags & SNOR_F_NO_READ_CR)
 		return 0;
 
-- 
2.35.1