linux-kernel - Re: [PATCH V2] nvmem: core: add a missing of_node

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Date:   Mon, 17 May 2021 10:19:05 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        bgolaszewski@...libre.com, gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH V2] nvmem: core: add a missing of_node_put



On 08/05/2021 07:16, Christophe JAILLET wrote:
> 'for_each_child_of_node' performs an of_node_get on each iteration, so a
> return from the middle of the loop requires an of_node_put.
> 
> Fixes: e888d445ac33 ("nvmem: resolve cells from DT at registration time")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---


Applied thanks,

--srini

> v2: Reorder code to delay the 'cell->np = of_node_get(child);'
>      Without this change, we needed a double 'of_node_put' in the last
>      hunk which could be confusing to the reader
> ---
>   drivers/nvmem/core.c | 9 ++++++---
>   1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
> index bca671ff4e54..f9c9c9859919 100644
> --- a/drivers/nvmem/core.c
> +++ b/drivers/nvmem/core.c
> @@ -686,15 +686,17 @@ static int nvmem_add_cells_from_of(struct nvmem_device *nvmem)
>   			continue;
>   		if (len < 2 * sizeof(u32)) {
>   			dev_err(dev, "nvmem: invalid reg on %pOF\n", child);
> +			of_node_put(child);
>   			return -EINVAL;
>   		}
>   
>   		cell = kzalloc(sizeof(*cell), GFP_KERNEL);
> -		if (!cell)
> +		if (!cell) {
> +			of_node_put(child);
>   			return -ENOMEM;
> +		}
>   
>   		cell->nvmem = nvmem;
> -		cell->np = of_node_get(child);
>   		cell->offset = be32_to_cpup(addr++);
>   		cell->bytes = be32_to_cpup(addr);
>   		cell->name = kasprintf(GFP_KERNEL, "%pOFn", child);
> @@ -715,11 +717,12 @@ static int nvmem_add_cells_from_of(struct nvmem_device *nvmem)
>   				cell->name, nvmem->stride);
>   			/* Cells already added will be freed later. */
>   			kfree_const(cell->name);
> -			of_node_put(cell->np);
>   			kfree(cell);
> +			of_node_put(child);
>   			return -EINVAL;
>   		}
>   
> +		cell->np = of_node_get(child);
>   		nvmem_cell_add(cell);
>   	}
>   
>