On Mon, Jun 15, 2020 at 02:18:54PM +0000, Robin Gong wrote: > On 2020/06/15 21:39 Mark Brown <broonie@xxxxxxxxxx> wrote: > > On Mon, Jun 15, 2020 at 01:35:01PM +0000, Robin Gong wrote: > > > Then how about choosing specific error code for such dma not ready > > > case where nothing went out on the bus neither? > > Yes, that's what I suggested. > Seems not easy to find a suitable error value, how about EBADR which > sounds like no any available dma_async_tx_descriptor got by calling dmaengine_prep_slave_sg? > #define EBADR 53 /* Invalid request descriptor */ We could also pass in a flag that could be set separately to the error code to indicate that nothing had happened to the hardware yet.
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