linux-kernel - Re: [alsa-devel] [PATCH 6/6] soundwire: stream: don't program ports for a stream that has not been prepared

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Date:   Fri, 10 Jan 2020 10:24:10 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        tiwai@...e.de, broonie@...nel.org, gregkh@...uxfoundation.org,
        jank@...ence.com, srinivas.kandagatla@...aro.org,
        slawomir.blauciak@...el.com,
        Bard liao <yung-chuan.liao@...ux.intel.com>,
        Rander Wang <rander.wang@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Rander Wang <rander.wang@...el.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>
Subject: Re: [alsa-devel] [PATCH 6/6] soundwire: stream: don't program ports
 for a stream that has not been prepared




>> GitHub issue: https://github.com/thesofproject/linux/issues/1637
> 
> This is not relevant for kernel, pls remove

Why? it's not uncommon to have bugzilla links, why would we lose the 
publicly-available information because GitHub is used?

>>   	list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) {
>> +
>> +		/*
>> +		 * this loop walks through all master runtimes for a
>> +		 * bus, but the ports can only be configured while
>> +		 * explicitly preparing a stream or handling an
>> +		 * already-prepared stream otherwise.
> 
> we can go upto 80 chars, make sure you align the above comment block as
> such

this is formatted by emacs, and with long words you get spaces at the end.

>>   		/* Program params */
>> -		ret = sdw_program_params(bus);
>> +		ret = sdw_program_params(bus, false);
> 
> Can you do a converse test as well, when the streams are running and
> concurrently two stream are stopped, it would be good to get it confirmed...

we cannot concurrently stop two streams since we take a bus lock. That's 
a problem but it'll have to be addressed separately. the problem with 
multiple streams addressed here is when one is CONFIGURED, which does 
not require a bus lock.