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SubjectRe: [alsa-devel] [PATCH v2] soundwire: stream: fix bad unlock balance
On 6/6/19 9:58 AM, Srinivas Kandagatla wrote:
> On 06/06/2019 15:28, Pierre-Louis Bossart wrote:
>> On 6/6/19 6:22 AM, Srinivas Kandagatla wrote:
>>> multi bank switching code takes lock on condition but releases without
>>> any check resulting in below warning.
>>> This patch fixes this.
>> Question to make sure we are talking about the same thing: multi-link
>> bank switching is a capability beyond the scope of the SoundWire spec
>> which requires hardware support to synchronize links and as Sanyog
>> hinted at in a previous email follow a different flow for bank switches.
>> You would not use the multi-link mode if you have different links that
>> can operate independently and have no synchronization requirement. You
>> would conversely use the multi-link mode if you have two devices on
>> the same type on different links and want audio to be rendered at the
>> same time.
>> Can you clarify if indeed you were using the full-blown multi-link
>> mode with hardware synchronization or a regular single-link operation?
>> I am not asking for details of your test hardware, just trying to
>> reconstruct the program flow leading to this problem.
> Am testing on a regular single link, which hits this path.
>> It could also be that your commit message was meant to say:
>> "the msg lock is taken for multi-link cases only but released
>> unconditionally, leading to an unlock balance warning for single-link
>> usages"?
> Yes.

Thanks for the precision. the change is legit so assuming the commit
message is reworded to mention single link usage please feel free to
take the following tag.

Acked-by: Pierre-Louis Bossart <>


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