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

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Date:   Wed, 8 Mar 2023 14:40:48 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Michael Walle <michael@...le.cc>
Cc:     Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH v2 1/4] mtd: core: provide unique name for nvmem device,
 take two

Hi Michael,

michael@...le.cc wrote on Wed,  8 Mar 2023 09:20:18 +0100:

> 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
> 

Thanks for the v2, as I want to share a clean immutable branch with
Greg, I made an exception in force pushing this patch in place of its
v1 counterpart.

>  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;
>  }


Thanks,
Miquèl