[alsa-devel] [RFC] ASoC: pcm: Trigger all commands on error

Markus Pargmann mpa at pengutronix.de
Tue Oct 8 11:48:39 CEST 2013

On Tue, Oct 08, 2013 at 10:34:13AM +0100, Mark Brown wrote:
> On Tue, Oct 08, 2013 at 10:29:33AM +0200, Markus Pargmann wrote:
> > To make proper error handling and only STOP functions that successfully
> > started, we have to store the state of each function. The command error
> > handling is done in pcm_native.c so we don't have any influence on that.
> I meant just unwinding the things done in the trigger call.

You mean unwinding when we detect the error? If we return the
error code from the trigger function, the pcm_native.c will still
trigger a STOP command which is executed on all components.

> > Another possibility is to explicitly allow multiple _STOPs. Then I could
> > fix the driver to store the clock state. But I would prefer a generic
> > solution.
> You're going to have to handle this anyway to be robust - what happens
> if it's the clock enable that fails?

If clk_enable fails, we can return an error code in the mxs-saif trigger
function. Of course the error handling is missing here, but it is not
necessary to store the state of the clock to handle errors properly.



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