linux-kernel - Re: [PATCH V5 3/9] firmware: imx: scu: drop return value check

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Date:   Mon, 7 Aug 2023 10:33:54 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc:     s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com, aisheng.dong@....com,
        alexander.stein@...tq-group.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Peng Fan <peng.fan@....com>
Subject: Re: [PATCH V5 3/9] firmware: imx: scu: drop return value check

On Mon, Jul 31, 2023 at 05:04:43PM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
> 
> For IMX_SC_MISC_FUNC_UNIQUE_ID, the scfw has a return value,
> and the imx-scu always return 0. So drop the return value check.

imx_scu_call_rpc() could fail for a few reason.  Are we not want to
check those possible failures?

Shawn

> 
> BTW, also initialize msg to 0.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/firmware/imx/imx-scu-soc.c | 9 ++-------
>  1 file changed, 2 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/firmware/imx/imx-scu-soc.c b/drivers/firmware/imx/imx-scu-soc.c
> index 2f32353de2c9..ef9103987e76 100644
> --- a/drivers/firmware/imx/imx-scu-soc.c
> +++ b/drivers/firmware/imx/imx-scu-soc.c
> @@ -33,20 +33,15 @@ struct imx_sc_msg_misc_get_soc_uid {
>  
>  static int imx_scu_soc_uid(u64 *soc_uid)
>  {
> -	struct imx_sc_msg_misc_get_soc_uid msg;
> +	struct imx_sc_msg_misc_get_soc_uid msg = { 0 };
>  	struct imx_sc_rpc_msg *hdr = &msg.hdr;
> -	int ret;
>  
>  	hdr->ver = IMX_SC_RPC_VERSION;
>  	hdr->svc = IMX_SC_RPC_SVC_MISC;
>  	hdr->func = IMX_SC_MISC_FUNC_UNIQUE_ID;
>  	hdr->size = 1;
>  
> -	ret = imx_scu_call_rpc(imx_sc_soc_ipc_handle, &msg, true);
> -	if (ret) {
> -		pr_err("%s: get soc uid failed, ret %d\n", __func__, ret);
> -		return ret;
> -	}
> +	imx_scu_call_rpc(imx_sc_soc_ipc_handle, &msg, true);
>  
>  	*soc_uid = msg.uid_high;
>  	*soc_uid <<= 32;
> -- 
> 2.37.1
>