linux-kernel - Re: [PATCH] remoteproc: mediatek: Don't attempt to remap l1tcm memory if missing

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Date: Fri, 28 Jun 2024 12:04:27 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Nícolas F. R. A. Prado <nfraprado@...labora.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Tzung-Bi Shih <tzungbi@...nel.org>, kernel@...labora.com,
	linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] remoteproc: mediatek: Don't attempt to remap l1tcm
 memory if missing

On Thu, Jun 27, 2024 at 05:20:55PM -0400, Nícolas F. R. A. Prado wrote:
> The current code doesn't check whether platform_get_resource_byname()
> succeeded to get the l1tcm memory, which is optional, before attempting
> to map it. This results in the following error message when it is
> missing:
> 
>   mtk-scp 10500000.scp: error -EINVAL: invalid resource (null)
> 
> Add a check so that the remapping is only attempted if the memory region
> exists. This also allows to simplify the logic handling failure to
> remap, since a failure then is always a failure.
> 
> Fixes: ca23ecfdbd44 ("remoteproc/mediatek: support L1TCM")
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
> ---
>  drivers/remoteproc/mtk_scp.c | 12 +++++-------
>  1 file changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
> index b885a9a041e4..b17757900cd7 100644
> --- a/drivers/remoteproc/mtk_scp.c
> +++ b/drivers/remoteproc/mtk_scp.c
> @@ -1344,14 +1344,12 @@ static int scp_probe(struct platform_device *pdev)
>  
>  	/* l1tcm is an optional memory region */
>  	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "l1tcm");
> -	scp_cluster->l1tcm_base = devm_ioremap_resource(dev, res);
> -	if (IS_ERR(scp_cluster->l1tcm_base)) {
> -		ret = PTR_ERR(scp_cluster->l1tcm_base);
> -		if (ret != -EINVAL)
> -			return dev_err_probe(dev, ret, "Failed to map l1tcm memory\n");
> +	if (res) {
> +		scp_cluster->l1tcm_base = devm_ioremap_resource(dev, res);
> +		if (IS_ERR(scp_cluster->l1tcm_base))
> +			return dev_err_probe(dev, PTR_ERR(scp_cluster->l1tcm_base),
> +					     "Failed to map l1tcm memory\n");
>  
> -		scp_cluster->l1tcm_base = NULL;
> -	} else {

Much better - I have applied this patch.

Regards,
Mathieu

>  		scp_cluster->l1tcm_size = resource_size(res);
>  		scp_cluster->l1tcm_phys = res->start;
>  	}
> 
> ---
> base-commit: 0fc4bfab2cd45f9acb86c4f04b5191e114e901ed
> change-id: 20240627-scp-invalid-resource-l1tcm-9f7cf45c17e6
> 
> Best regards,
> -- 
> Nícolas F. R. A. Prado <nfraprado@...labora.com>
>