On Fri, May 30, 2014 at 09:27:20AM +0000, Wang, Jiada (ESD) wrote: > Hi Shijie > > After apply this patch into our kernel, > We are facing data hang issue when sending big size file (2M used in test) to > uart port > Note: Rx port is also keep receiving data. > > After read the implementation of uart_stop(), > I feel like, stop_tx() is used to perform flow control when like a XOFF is > received. > Which means no data should be dropped, as they may need to be sent out, > When next start_tx() is called. > > But by calling dmaengine_termiate_all(), the data already be submitted to DMA > engine, > May be lost, thus cause data hang. > > What do you think? This patch has been reverted by Greg.
I also noticed the data loss issue. thanks Huang Shijie -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
