linux-kernel - [PATCH v2 1/4] mtd: core: provide unique name for nvmem device, take two

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Message-Id: <20230308082021.870459-1-michael@walle.cc>
Date:   Wed,  8 Mar 2023 09:20:18 +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 v2 1/4] mtd: core: provide unique name for nvmem device, take two

Commit c048b60d39e1 ("mtd: core: provide unique name for nvmem device")
tries to give the nvmem device a unique name, but fails badly if the mtd
device doesn't have a "struct device" associated with it, i.e. if
CONFIG_MTD_PARTITIONED_MASTER is not set. This will result in the name
"(null)-user-otp", which is not unique. It seems the best we can do is
to use the compatible name together with a unique identifier added by
the nvmem subsystem by using NVMEM_DEVID_AUTO.

Fixes: c048b60d39e1 ("mtd: core: provide unique name for nvmem device")
Cc: stable@...r.kernel.org
Signed-off-by: Michael Walle <michael@...le.cc>
---
v2:
 - actually use NVMEM_DEVID_AUTO as described in the commit message

 drivers/mtd/mtdcore.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 0feacb9fbdac..8fc66cda4a09 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -888,8 +888,8 @@ static struct nvmem_device *mtd_otp_nvmem_register(struct mtd_info *mtd,
 
 	/* OTP nvmem will be registered on the physical device */
 	config.dev = mtd->dev.parent;
-	config.name = kasprintf(GFP_KERNEL, "%s-%s", dev_name(&mtd->dev), compatible);
-	config.id = NVMEM_DEVID_NONE;
+	config.name = compatible;
+	config.id = NVMEM_DEVID_AUTO;
 	config.owner = THIS_MODULE;
 	config.type = NVMEM_TYPE_OTP;
 	config.root_only = true;
@@ -905,7 +905,6 @@ static struct nvmem_device *mtd_otp_nvmem_register(struct mtd_info *mtd,
 		nvmem = NULL;
 
 	of_node_put(np);
-	kfree(config.name);
 
 	return nvmem;
 }
-- 
2.30.2