Re: [PATCH] ata: ahci_tegra: remove kcalloc

[Damien Le Moal <dlemoal@kernel.org>]

On 2026/03/24 14:16, Rosen Penev wrote:
> Combine allocations into one by using a flexible array member.
> 
> Signed-off-by: Rosen Penev <rosenp@gmail.com>
> ---
>  drivers/ata/ahci_tegra.c | 15 ++++++---------
>  1 file changed, 6 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/ata/ahci_tegra.c b/drivers/ata/ahci_tegra.c
> index 44584eed6374..5972fe04ff3f 100644
> --- a/drivers/ata/ahci_tegra.c
> +++ b/drivers/ata/ahci_tegra.c
> @@ -175,8 +175,9 @@ struct tegra_ahci_priv {
>  	struct reset_control	   *sata_cold_rst;
>  	/* Needs special handling, cannot use ahci_platform */
>  	struct clk		   *sata_clk;
> -	struct regulator_bulk_data *supplies;
>  	const struct tegra_ahci_soc *soc;
> +
> +	struct regulator_bulk_data supplies[];

I think this needs a __counted_by() annotation, but not sure if that is possible
given that soc->num_supplies is not in this structure. Might need a copy of it.

>  };
>  
>  static void tegra_ahci_handle_quirks(struct ahci_host_priv *hpriv)
> @@ -512,6 +513,7 @@ static const struct scsi_host_template ahci_platform_sht = {
>  
>  static int tegra_ahci_probe(struct platform_device *pdev)
>  {
> +	const struct tegra_ahci_soc *soc;
>  	struct ahci_host_priv *hpriv;
>  	struct tegra_ahci_priv *tegra;
>  	struct resource *res;
> @@ -521,14 +523,15 @@ static int tegra_ahci_probe(struct platform_device *pdev)
>  	if (IS_ERR(hpriv))
>  		return PTR_ERR(hpriv);
>  
> -	tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
> +	soc = of_device_get_match_data(&pdev->dev);
> +	tegra = devm_kzalloc(&pdev->dev, struct_size(tegra, supplies, soc->num_supplies), GFP_KERNEL);
>  	if (!tegra)
>  		return -ENOMEM;
>  
>  	hpriv->plat_data = tegra;
>  
>  	tegra->pdev = pdev;
> -	tegra->soc = of_device_get_match_data(&pdev->dev);
> +	tegra->soc = soc;
>  
>  	tegra->sata_regs = devm_platform_ioremap_resource(pdev, 1);
>  	if (IS_ERR(tegra->sata_regs))
> @@ -571,12 +574,6 @@ static int tegra_ahci_probe(struct platform_device *pdev)
>  		return PTR_ERR(tegra->sata_clk);
>  	}
>  
> -	tegra->supplies = devm_kcalloc(&pdev->dev,
> -				       tegra->soc->num_supplies,
> -				       sizeof(*tegra->supplies), GFP_KERNEL);
> -	if (!tegra->supplies)
> -		return -ENOMEM;
> -
>  	regulator_bulk_set_supply_names(tegra->supplies,
>  					tegra->soc->supply_names,
>  					tegra->soc->num_supplies);


-- 
Damien Le Moal
Western Digital Research