linux-kernel - Re: [PATCH net-next] net: ethernet: mtk_eth_soc: add missing check for rhashtable

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Date: Thu, 16 May 2024 12:10:35 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Chen Ni <nichen@...as.ac.cn>, nbd@....name, sean.wang@...iatek.com,
 Mark-MC.Lee@...iatek.com, lorenzo@...nel.org, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
 matthias.bgg@...il.com
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net-next] net: ethernet: mtk_eth_soc: add missing check
 for rhashtable_init

Il 16/05/24 11:24, Chen Ni ha scritto:
> Add check for the return value of rhashtable_init() and return the error
> if it fails in order to catch the error.
> 
> Fixes: 33fc42de3327 ("net: ethernet: mtk_eth_soc: support creating mac address based offload entries")
> Signed-off-by: Chen Ni <nichen@...as.ac.cn>
> ---
>   drivers/net/ethernet/mediatek/mtk_ppe.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/mediatek/mtk_ppe.c b/drivers/net/ethernet/mediatek/mtk_ppe.c
> index 0acee405a749..f7e5e6e52cdf 100644
> --- a/drivers/net/ethernet/mediatek/mtk_ppe.c
> +++ b/drivers/net/ethernet/mediatek/mtk_ppe.c
> @@ -884,12 +884,15 @@ struct mtk_ppe *mtk_ppe_init(struct mtk_eth *eth, void __iomem *base, int index)
>   	struct mtk_ppe *ppe;
>   	u32 foe_flow_size;
>   	void *foe;
> +	int ret;
>   
>   	ppe = devm_kzalloc(dev, sizeof(*ppe), GFP_KERNEL);
>   	if (!ppe)
>   		return NULL;
>   
> -	rhashtable_init(&ppe->l2_flows, &mtk_flow_l2_ht_params);
> +	ret = rhashtable_init(&ppe->l2_flows, &mtk_flow_l2_ht_params);
> +	if (ret)
> +		return NULL;

return PTR_ERR(ret);

.then in mtk_eth_soc.c, you will have to fix the check:
			if (!eth->ppe[i]) {

to IS_ERR_OR_NULL( ... )

Cheers,
Angelo

>   
>   	/* need to allocate a separate device, since it PPE DMA access is
>   	 * not coherent.