linux-kernel - Re: [PATCH 1/5] soundwire: stream: uniquify dev

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Date:   Fri, 13 Jan 2023 11:48:12 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Amadeusz Sławiński 
        <amadeuszx.slawinski@...ux.intel.com>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        alsa-devel@...a-project.org, vkoul@...nel.org
Cc:     vinod.koul@...aro.org, bard.liao@...el.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] soundwire: stream: uniquify dev_err() logs



On 1/13/23 04:22, Amadeusz Sławiński wrote:
> On 1/13/2023 10:35 AM, Bard Liao wrote:
>> From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
>>
>> There are a couple of duplicate logs which makes harder than needed to
>> follow the error flows. Add __func__ or make the log unique.
>>
>> Signed-off-by: Pierre-Louis Bossart
>> <pierre-louis.bossart@...ux.intel.com>
>> Reviewed-by: Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>
>> Signed-off-by: Bard Liao <yung-chuan.liao@...ux.intel.com>
>> ---
>>   drivers/soundwire/stream.c | 14 ++++++++------
>>   1 file changed, 8 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
>> index df3b36670df4..e0eae0b98267 100644
>> --- a/drivers/soundwire/stream.c
>> +++ b/drivers/soundwire/stream.c
>> @@ -1389,7 +1389,7 @@ static int _sdw_prepare_stream(struct
>> sdw_stream_runtime *stream,
>>         ret = do_bank_switch(stream);
>>       if (ret < 0) {
>> -        dev_err(bus->dev, "Bank switch failed: %d\n", ret);
>> +        dev_err(bus->dev, "do_bank_switch failed: %d\n", ret);
>>           goto restore_params;
>>       }
> 
> This one seems bit unrelated to the change and makes error message
> inconsistent with:
> https://git.kernel.org/pub/scm/linux/kernel/git/vkoul/soundwire.git/tree/drivers/soundwire/stream.c?h=next&id=545c365185a47672b1d5cc13c84057a1e874993c#n1498
> and
> https://git.kernel.org/pub/scm/linux/kernel/git/vkoul/soundwire.git/tree/drivers/soundwire/stream.c?h=next&id=545c365185a47672b1d5cc13c84057a1e874993c#n1575
> which actually brings me to another suggestion, can this error message
> perhaps be just moved into do_bank_switch() function itself, instead of
> being duplicated multiple times or alternatively just also prefix all of
> them with function name?

well, as you correctly pointed out, there are multiple users of
'do_bank_switch' so we don't want to put the message in the function itself.

We could indeed use __func__ instead, that'd be fine.

Looking at the code, there are also inconsistencies with the use of
pr_err and dev_err. dev_err(bus->dev is wrong actually, this would use
the bus variable assigned in the previous loop, this makes no sense for
multi-segment topologies.

Let's drop this patch and revisit all this, hope Vinod can deal with
patch 1..4 otherwise we'll resend the set.

Thanks Amadeusz for the feedback.