Hi Andy, On Thu, Jun 12, 2014 at 06:51:18PM +0300, Andy Shevchenko wrote: > The documentation says that we have to sync DMA regions after CPU access and > before any DMA transfer is going on. The actual DMA for buffer happens when we > call dmaengine_submit() (*). The original code syncs data after this call which > might lead to the corrupted data in actual stream. > > (*) Accordingly to the Documentation/dmaengine.txt the dmaengine_submit call > shouldn't do the transfer, but some DMA controller drivers abuse this rule. > Thus, we would like to have this patch until all DMA controller drivers will be > fixed. Even after that it will be harmless. It's probable better that we directly fix the DMA engine drivers instead of working around the issue here. Thanks, -- heikki -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
