linux-kernel - Re: [PATCH 03/13] coresight: tmc-etb/etf: Prepare to handle errors enabling

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Date:   Thu, 16 Aug 2018 15:47:54 +0100
From:   Suzuki K Poulose <Suzuki.Poulose@....com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        robert.walker@....com, mike.leach@....com
Subject: Re: [PATCH 03/13] coresight: tmc-etb/etf: Prepare to handle errors
 enabling

On 15/08/18 20:22, Mathieu Poirier wrote:
> On Mon, Aug 06, 2018 at 02:41:45PM +0100, Suzuki K Poulose wrote:
>> Prepare to handle errors in enabling the hardware and
>> report it back to the core driver.
>>
>> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
>> ---
>>   drivers/hwtracing/coresight/coresight-tmc-etf.c | 71 +++++++++++++++----------
>>   1 file changed, 44 insertions(+), 27 deletions(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
>> index 4156c95..ceb4b30 100644
>> --- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
>> +++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c

>> @@ -271,6 +285,7 @@ static void tmc_disable_etf_sink(struct coresight_device *csdev)
>>   static int tmc_enable_etf_link(struct coresight_device *csdev,
>>   			       int inport, int outport)
>>   {
>> +	int ret;
>>   	unsigned long flags;
>>   	struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
>>   
>> @@ -280,11 +295,13 @@ static int tmc_enable_etf_link(struct coresight_device *csdev,
>>   		return -EBUSY;
>>   	}
>>   
>> -	tmc_etf_enable_hw(drvdata);
>> -	drvdata->mode = CS_MODE_SYSFS;
>> +	ret = tmc_etf_enable_hw(drvdata);
>> +	if (!ret)
>> +		drvdata->mode = CS_MODE_SYSFS;
>>   	spin_unlock_irqrestore(&drvdata->spinlock, flags);
>>   
>> -	dev_dbg(drvdata->dev, "TMC-ETF enabled\n");
>> +	if (!ret)
>> +		dev_dbg(drvdata->dev, "TMC-ETF enabled\n");
>>   	return 0;
> 
> We need to tell the caller if an error as occured:
> 
>          return ret;
> 

Thanks for catching it, will fix.

Suzuki