linux-kernel - Re: [PATCH 08/12] coresight tmc: Handle configuration types properly

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Date:   Wed, 14 Jun 2017 11:59:16 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/12] coresight tmc: Handle configuration types properly

On Mon, Jun 12, 2017 at 03:36:47PM +0100, Suzuki K Poulose wrote:
> Coresight SoC 600 defines a new configuration for TMC, Embedded Trace
> Streamer (ETS), indicated by 0x3 in MODE:CONFIG_TYPE. Make sure
> the driver handles the new type properly.

>From what I see below this patch only improves readability by moving the if/else
compound to a case statement - there is no trace of the new ETS block.
Readability enhancement are good but the changelog must match the code.
 
> 
> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> ---
>  drivers/hwtracing/coresight/coresight-tmc.c | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
> index fd5a2e0..7152656 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc.c
> +++ b/drivers/hwtracing/coresight/coresight-tmc.c
> @@ -358,11 +358,13 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
>  	desc.dev = dev;
>  	desc.groups = coresight_tmc_groups;
>  
> -	if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) {
> +	switch (drvdata->config_type) {
> +	case TMC_CONFIG_TYPE_ETB:
>  		desc.type = CORESIGHT_DEV_TYPE_SINK;
>  		desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
>  		desc.ops = &tmc_etb_cs_ops;
> -	} else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
> +		break;
> +	case TMC_CONFIG_TYPE_ETR:
>  		desc.type = CORESIGHT_DEV_TYPE_SINK;
>  		desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
>  		desc.ops = &tmc_etr_cs_ops;
> @@ -373,10 +375,16 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
>  		ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(40));
>  		if (ret)
>  			goto out;
> -	} else {
> +		break;
> +	case TMC_CONFIG_TYPE_ETF:
>  		desc.type = CORESIGHT_DEV_TYPE_LINKSINK;
>  		desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_FIFO;
>  		desc.ops = &tmc_etf_cs_ops;
> +		break;
> +	default:
> +		pr_err("%s: Unsupported TMC config\n", pdata->name);
> +		ret = -EINVAL;
> +		goto out;
>  	}
>  
>  	drvdata->csdev = coresight_register(&desc);
> -- 
> 2.7.4
>