linux-kernel - [PATCH] mtd: nand: raw: qcom_nandc: handle ret from parse with codeword

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Date:   Fri, 21 Oct 2022 18:53:04 +0200
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Manivannan Sadhasivam <mani@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Christian Marangi <ansuelsmth@...il.com>,
        linux-mtd@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org
Subject: [PATCH] mtd: nand: raw: qcom_nandc: handle ret from parse with codeword_fixup

With use_codeword_fixup enabled, any return from
mtd_device_parse_register gets overwritten. Aside from the clear bug, this
is also problematic as a parser can EPROBE_DEFER and because this is not
correctly handled, the nand is never rescanned later in the bootup
process.

An example of this problem is when smem requires additional time to be
probed and nandc use qcomsmempart as parser. Parser will return
EPROBE_DEFER but in the current code this ret gets overwritten by
qcom_nand_host_parse_boot_partitions and qcom_nand_host_init_and_register
return 0.

Correctly handle the return code from mtd_device_parse_register so that
any error from this function is not ignored.

Fixes: 862bdedd7f4b ("mtd: nand: raw: qcom_nandc: add support for unprotected spare data pages")
Cc: stable@...r.kernel.org # v6.0+
Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
---
 drivers/mtd/nand/raw/qcom_nandc.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
index 8f80019a9f01..198a44794d2d 100644
--- a/drivers/mtd/nand/raw/qcom_nandc.c
+++ b/drivers/mtd/nand/raw/qcom_nandc.c
@@ -3167,16 +3167,18 @@ static int qcom_nand_host_init_and_register(struct qcom_nand_controller *nandc,

 	ret = mtd_device_parse_register(mtd, probes, NULL, NULL, 0);
 	if (ret)
-		nand_cleanup(chip);
+		goto err;

 	if (nandc->props->use_codeword_fixup) {
 		ret = qcom_nand_host_parse_boot_partitions(nandc, host, dn);
-		if (ret) {
-			nand_cleanup(chip);
-			return ret;
-		}
+		if (ret)
+			goto err;
 	}

+	return 0;
+
+err:
+	nand_cleanup(chip);
 	return ret;
 }

-- 
2.37.2