[PATCH V3 6/6] coresight: platform: acpi: Ignore the absence of graph

[Suzuki K Poulose]

On 19/05/2023 06:21, Anshuman Khandual wrote:
> From: Suzuki K Poulose <suzuki.poulose at arm.com>
> 
> Some components may not have graph connections for describing
> the trace path. e.g., ETE, where it could directly use the per
> CPU TRBE. Ignore the absence of graph connections
> 
> Signed-off-by: Suzuki K Poulose <suzuki.poulose at arm.com>
> Signed-off-by: Anshuman Khandual <anshuman.khandual at arm.com>

Please could you move this before the Patch 5, where we add
ACPI support for etm4x with system instructions ? That way
the support is up with that patch, without an error that
is fixed by this patch.

Suzuki


> ---
>   drivers/hwtracing/coresight/coresight-platform.c | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
> index 475899714104..c4b4fbde8550 100644
> --- a/drivers/hwtracing/coresight/coresight-platform.c
> +++ b/drivers/hwtracing/coresight/coresight-platform.c
> @@ -692,8 +692,12 @@ static int acpi_coresight_parse_graph(struct acpi_device *adev,
>   
>   	pdata->nr_inport = pdata->nr_outport = 0;
>   	graph = acpi_get_coresight_graph(adev);
> +	/*
> +	 * There are no graph connections, which is fine for some components.
> +	 * e.g., ETE
> +	 */
>   	if (!graph)
> -		return -ENOENT;
> +		return 0;
>   
>   	nlinks = graph->package.elements[2].integer.value;
>   	if (!nlinks)