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86f29c7442
We intentionally do not return an error if we get a permanent failure from dma_request_chan() in order to support systems which have TX only or RX only channels. Add a comment documenting this. Reported-by: Andy Shevchenko <andriy.shevchenko@intel.com> Signed-off-by: Mark Brown <broonie@kernel.org> Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com> Link: https://lore.kernel.org/r/20201008161105.21804-1-broonie@kernel.org Signed-off-by: Mark Brown <broonie@kernel.org>