Message-ID: <6244680f-44db-0706-eada-dffdb05f116a@linaro.org>
Date:   Fri, 10 Mar 2023 09:57:54 +0000
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Subject: Re: [PATCH v2 09/21] nvmem: core: return -ENOENT if nvmem cell is not
 found
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To:     Miquel Raynal <miquel.raynal@bootlin.com>,
        linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Michael Walle <michael@walle.cc>,
        =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= <rafal@milecki.pl>,
        Robert Marko <robert.marko@sartura.hr>,
        Luka Perkov <luka.perkov@sartura.hr>,
        Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
        Rob Herring <robh+dt@kernel.org>,
        Frank Rowand <frowand.list@gmail.com>,
        devicetree@vger.kernel.org,
        Alexander Stein <alexander.stein@ew.tq-group.com>
References: <20230307165359.225361-1-miquel.raynal@bootlin.com>
 <20230307165359.225361-10-miquel.raynal@bootlin.com>
From:   Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
In-Reply-To: <20230307165359.225361-10-miquel.raynal@bootlin.com>
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On 07/03/2023 16:53, Miquel Raynal wrote:
> From: Michael Walle <michael@walle.cc>
> 
> Prior to commit 3cb05fdbaed6 ("nvmem: core: add an index parameter to
> the cell") of_nvmem_cell_get() would return -ENOENT if the cell wasn't
> found. Particularly, if of_property_match_string() returned -EINVAL,
> that return code was passed as the index to of_parse_phandle(), which
> then detected it as invalid and returned NULL. That led to an return
> code of -ENOENT.
> 
> With the new code, the negative index will lead to an -EINVAL of
> of_parse_phandle_with_optional_args() which pass straight to the
> caller and break those who expect an -ENOENT.
> 
> Fix it by always returning -ENOENT.
> 
> Fixes: efff2655ab0f ("nvmem: core: add an index parameter to the cell")
> Reported-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> Signed-off-by: Michael Walle <michael@walle.cc>
> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
> ---

Already applied.

--srini
>   drivers/nvmem/core.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
> index 174ef3574e07..22024b830788 100644
> --- a/drivers/nvmem/core.c
> +++ b/drivers/nvmem/core.c
> @@ -1231,7 +1231,7 @@ struct nvmem_cell *of_nvmem_cell_get(struct device_node *np, const char *id)
>   						  "#nvmem-cell-cells",
>   						  index, &cell_spec);
>   	if (ret)
> -		return ERR_PTR(ret);
> +		return ERR_PTR(-ENOENT);
>   
>   	if (cell_spec.args_count > 1)
>   		return ERR_PTR(-EINVAL);