linux-kernel - [PATCH 3/4] mtd: core: fix error path for nvmem provider

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Date:   Mon,  6 Mar 2023 13:58:04 +0100
From:   Michael Walle <michael@...le.cc>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Michael Walle <michael@...le.cc>, stable@...r.kernel.org
Subject: [PATCH 3/4] mtd: core: fix error path for nvmem provider

If mtd_otp_nvmem_add() fails, the partitions won't be removed
because there is simply no call to del_mtd_partitions().
Unfortunately, add_mtd_partitions() will print all partitions to
the kernel console. If mtd_otp_nvmem_add() returns -EPROBE_DEFER
this would print the partitions multiple times to the kernel
console. Instead move mtd_otp_nvmem_add() to the beginning of the
function.

Fixes: 4b361cfa8624 ("mtd: core: add OTP nvmem provider support")
Cc: stable@...r.kernel.org
Signed-off-by: Michael Walle <michael@...le.cc>
---
 drivers/mtd/mtdcore.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 4a19e69fb77b..d6675bf03557 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -1022,10 +1022,14 @@ int mtd_device_parse_register(struct mtd_info *mtd, const char * const *types,
 
 	mtd_set_dev_defaults(mtd);
 
+	ret = mtd_otp_nvmem_add(mtd);
+	if (ret)
+		goto out;
+
 	if (IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER)) {
 		ret = add_mtd_device(mtd);
 		if (ret)
-			return ret;
+			goto out;
 	}
 
 	/* Prefer parsed partitions over driver-provided fallback */
@@ -1060,9 +1064,12 @@ int mtd_device_parse_register(struct mtd_info *mtd, const char * const *types,
 		register_reboot_notifier(&mtd->reboot_notifier);
 	}
 
-	ret = mtd_otp_nvmem_add(mtd);
-
 out:
+	if (ret) {
+		nvmem_unregister(mtd->otp_user_nvmem);
+		nvmem_unregister(mtd->otp_factory_nvmem);
+	}
+
 	if (ret && device_is_registered(&mtd->dev))
 		del_mtd_device(mtd);
 
-- 
2.30.2