linux-kernel - Re: [PATCH] coresight: tmc-etr: Handle enable failure in tmc_read_unprepare

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Message-ID: <7ad38cc7-d2f7-b282-ac37-25e56e0d6c47@arm.com>
Date:   Wed, 22 Feb 2023 09:33:02 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     Yabin Cui <yabinc@...gle.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>, James Clark <james.clark@....com>
Cc:     coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] coresight: tmc-etr: Handle enable failure in
 tmc_read_unprepare_etr

On 21/02/2023 18:38, Yabin Cui wrote:
> Ping for review?
> 
> On Fri, Feb 10, 2023 at 11:43 PM Yabin Cui <yabinc@...gle.com> wrote:
>>
>> It's similar to what we did in tmc_read_unprepare_etb.
>>
>> Signed-off-by: Yabin Cui <yabinc@...gle.com>
>> ---

Thanks Yabin for the patch, will queue this at rc1

Suzuki

>>   drivers/hwtracing/coresight/coresight-tmc-etr.c | 7 ++++++-
>>   1 file changed, 6 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
>> index 918d461fcf4a..b04f12079efd 100644
>> --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
>> +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
>> @@ -1763,6 +1763,7 @@ int tmc_read_unprepare_etr(struct tmc_drvdata *drvdata)
>>   {
>>          unsigned long flags;
>>          struct etr_buf *sysfs_buf = NULL;
>> +       int rc = 0;
>>
>>          /* config types are set a boot time and never change */
>>          if (WARN_ON_ONCE(drvdata->config_type != TMC_CONFIG_TYPE_ETR))
>> @@ -1777,7 +1778,11 @@ int tmc_read_unprepare_etr(struct tmc_drvdata *drvdata)
>>                   * buffer. Since the tracer is still enabled drvdata::buf can't
>>                   * be NULL.
>>                   */
>> -               __tmc_etr_enable_hw(drvdata);
>> +               rc = __tmc_etr_enable_hw(drvdata);
>> +               if (rc) {
>> +                       spin_unlock_irqrestore(&drvdata->spinlock, flags);
>> +                       return rc;
>> +               }
>>          } else {
>>                  /*
>>                   * The ETR is not tracing and the buffer was just read.
>> --
>> 2.39.1.581.gbfd45094c4-goog
>>